pvaccess module is a python wrapper for EPICS PV Access and other C++ libraries.
PvObject¶
-
class
pvaccess.
PvObject
¶ Bases:
Boost.Python.instance
PvObject represents a generic PV structure.
PvObject(structureDict [,valueDict][,typeId])
- Parameter
structureDict (dict) - dictionary of key:value pairs describing the underlying PV structure in terms of field names and their types
The dictionary key is a string (PV field name), and value is one of:
PVTYPE: scalar type, can be BOOLEAN, BYTE, UBYTE, SHORT, USHORT, INT, UINT, LONG, ULONG, FLOAT, DOUBLE, or STRING
[PVTYPE]: single element list representing scalar array
{key:value, …}: structure
[{key:value, …}]: single element list representing structure array
(): variant union
[()]: single element list representing variant union array
({key:value, …},): restricted union
[({key:value, …},)]: single element list representing restricted union array
- Parameter
valueDict (dict) - (optional) dictionary of key:value pairs to be used to set field values in the underlying PV structure
- Raises
InvalidArgument - in case structure dictionary cannot be parsed
- Parameter
typeId (str) - (optional) The type ID string of the PV structure
Examples of PvObject initialization:
pv1 = PvObject({'anInt' : INT}) pv2 = PvObject({'aShort' : SHORT, 'anUInt' : UINT, 'aString' : STRING}) pv3 = PvObject({'aStringArray' : [STRING], 'aStruct' : {'aString2' : STRING, 'aBoolArray' : [BOOLEAN], 'aStruct2' : {'aFloat' : FLOAT, 'aString3' : [STRING]}}}) pv4 = PvObject({'aStructArray' : [{'anInt' : INT, 'anInt2' : INT, 'aDouble' : DOUBLE}]}) pv5 = PvObject({'anUnion' : ({'anInt' : INT, 'aDouble' : DOUBLE},)}) pv6 = PvObject({'aVariant' : ()}) pv7 = PvObject({'value' : DOUBLE}, 'epics:nt/NTScalar:1.0')
In addition to various set/get methods described below, PvObject elements can be accessed and manipulated similar to dictionaries:
>>> pv = PvObject({'a' : {'b' : STRING, 'c' : FLOAT}}, {'a' : {'b' : 'my string', 'c' : 10.1}}) >>> print(pv) structure structure a float c 10.1 string b my string >>> dict(pv) {'a': {'b': 'my string', 'c': 10.1}} >>> pv['a.b'] 'my string' >>> pv['a.c'] 10.1 >>> print('a.b' in pv) True >>> print('a.d' in pv) False >>> pv['a.b'] = 'updated string' >>> pv['a.c'] = 20.2 >>> print(pv) structure structure a float c 20.2 string b updated string
Note that compiling pvaPy with Boost.NumPy allows one to retrieve numeric scalar arrays as read-only NumPy arrays:
>>> pv = PvObject({'a' : {'b' : STRING, 'c' : [INT]}}, {'a' : {'b' : 'my string', 'c' : [1,2,3,4,5]}}) >>> print(pv) structure structure a int[] c [1,2,3,4,5] string b my string >>> print(pv.useNumPyArrays) True >>> c = pv['a.c'] >>> c array([1, 2, 3, 4, 5], dtype=int32) >>> type(c) <type 'numpy.ndarray'> >>> pv.useNumPyArrays = False >>> c2 = pv['a.c'] >>> c2 >>> [1, 2, 3, 4, 5] >>> type(c2) <type 'list'>
One can also set numeric scalar arrays using NumPy arrays:
>>> pv = PvObject({'a' : [SHORT]}) >>> b = numpy.array([11,22,33,44,55,66,77], dtype=numpy.dtype('int16')) >>> print(b) ([11 22 33 44 55 66 77], dtype=int16) >>> pv['a'] = b >>> print(pv) structure short[] a [11,22,33,44,55,66,77]
-
createUnionArrayElementField
((PvObject)arg1, (str)fieldName, (str)unionFieldName) → PvObject :¶ - createUnionArrayElementField((str)fieldName, (str)unionFieldName) => PvObject :
Creates union field object for an union array assigned to a given field name.
- Parameter
fieldName (str) - field name
- Parameter
unionFieldName (str) - union field name to be created
- Returns
PV object for new union field
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union array
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)], 'aString' : STRING}) unionPv = pv.createUnionArrayElementField('anUnionArray', 'anInt')
- createUnionArrayElementField((str)unionFieldName) => PvObject :
Creates union field object for an union array from a single-field structure, or from a structure that has union array field named ‘value’.
- Parameter
unionFieldName (str) - union field name to be created
- Returns
PV object for new union field
- Raises
InvalidRequest - when single-field structure has no union array field or multiple-field structure has no union array ‘value’ field
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)]}) unionPv = pv.createUnionArrayElementField('anInt')
-
createUnionField
((PvObject)arg1, (str)fieldName, (str)unionFieldName) → PvObject :¶ - createUnionField((str)fieldName, (str)unionFieldName) => PvObject :
Creates union field object for an union assigned to a given field name.
- Parameter
fieldName (str) - field name
- Parameter
unionFieldName (str) - union field name to be created
- Returns
PV object for new union field
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) createdPv = pv.createUnionField('anUnion', 'anInt')
- createUnionField((str)unionFieldName) => PvObject :
Creates union field object for an union from a single-field structure, or from a structure that has union field named ‘value’.
- Parameter
unionFieldName (str) - union field name to be created
- Returns
PV object for new union field
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) createdPv = pv.createUnionField('anInt')
-
get
((PvObject)arg1) → dict :¶ - get() => dict :
Retrieves PV structure as python dictionary.
- Returns
python key:value dictionary representing current PV structure in terms of field names and their values
pv = PvObject({'anInt' : INT, 'aString' : STRING}) pv.set({'anInt' : 1}) valueDict = pv.get()
-
getBoolean
((PvObject)arg1) → bool :¶ - getBoolean() => bool :
Retrieves boolean value from a single-field structure, or from a structure that has boolean field named ‘value’.
- Returns
boolean value
- Raises
InvalidRequest - when single-field structure has no boolean field or multiple-field structure has no boolean ‘value’ field
pv = PvObject({'aBoolean' : BOOLEAN}) value = pv.getBoolean()
- getBoolean((str)fieldName) => bool :
Retrieves boolean value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
boolean value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a boolean
pv = PvObject({'aBoolean' : BOOLEAN, 'aString' : STRING}) value = pv.getBoolean('aBoolean')
-
getByte
((PvObject)arg1) → str :¶ - getByte() => str :
Retrieves byte (character) value from a single-field structure, or from a structure that has byte field named ‘value’.
- Returns
byte value
- Raises
InvalidRequest - when single-field structure has no byte field or multiple-field structure has no byte ‘value’ field
pv = PvObject({'aByte' : BYTE}) value = pv.getByte()
- getByte((str)fieldName) => str :
Retrieves byte (character) value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
byte value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a byte
pv = PvObject({'aByte' : BYTE, 'aString' : STRING}) value = pv.getByte('aByte')
-
getDouble
((PvObject)arg1) → float :¶ - getDouble() => float :
Retrieves double value from a single-field structure, or from a structure that has double field named ‘value’.
- Returns
double value
- Raises
InvalidRequest - when single-field structure has no double field or multiple-field structure has no double ‘value’ field
pv = PvObject({'aDouble' : DOUBLE}) value = pv.getDouble()
- getDouble((str)fieldName) => float :
Retrieves double value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
double value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a double
pv = PvObject({'aDouble' : DOUBLE, 'aString' : STRING}) value = pv.getDouble('aDouble')
-
getFloat
((PvObject)arg1) → float :¶ - getFloat() => float :
Retrieves float value from a single-field structure, or from a structure that has float field named ‘value’.
- Returns
float value
- Raises
InvalidRequest - when single-field structure has no float field or multiple-field structure has no float ‘value’ field
pv = PvObject({'aFloat' : FLOAT}) value = pv.getFloat()
- getFloat((str)fieldName) => float :
Retrieves float value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
float value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a float
pv = PvObject({'aFloat' : FLOAT, 'aString' : STRING}) value = pv.getFloat('aFloat')
-
getInt
((PvObject)arg1) → int :¶ - getInt() => int :
Retrieves int value from a single-field structure, or from a structure that has int field named ‘value’.
- Returns
int value
- Raises
InvalidRequest - when single-field structure has no int field or multiple-field structure has no int ‘value’ field
pv = PvObject({'anInt' : INT}) value = pv.getInt()
- getInt((str)fieldName) => int :
Retrieves int value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
int value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an int
pv = PvObject({'anInt' : INT, 'aString' : STRING}) value = pv.getInt('anInt')
-
getIntrospectionDict
((PvObject)arg1) → dict :¶ - getIntrospectionDict() => dict :
Retrieves PV structure definition as python dictionary (same as getStructureDict() method).
- Returns
python key:value dictionary representing PV structure definition in terms of field names and their types (introspection dictionary)
introspectionDict = pv.getIntrospectionDict()
-
getLong
((PvObject)arg1) → int :¶ - getLong() => int :
Retrieves long value from a single-field structure, or from a structure that has long field named ‘value’.
- Returns
long value
- Raises
InvalidRequest - when single-field structure has no long field or multiple-field structure has no long ‘value’ field
pv = PvObject({'aLong' : LONG}) value = pv.getLong()
- getLong((str)fieldName) => int :
Retrieves short value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
long value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a long
pv = PvObject({'aLong' : LONG, 'aString' : STRING}) value = pv.getLong('aLong')
-
getPyObject
((PvObject)arg1) → object :¶ - getPyObject() => object :
Retrieves value object from a single-field structure, or from a structure that has field named ‘value’.
- Returns
value object
- Raises
InvalidRequest - when single-field structure has no field or multiple-field structure has no ‘value’ field
pv = PvObject({'aString' : STRING}) value = pv.getPyObject()
- getPyObject((str)fieldPath) => object :
Retrieves value object assigned to the given PV field path, which uses ‘.’ as the field name separator.
- Parameter
fieldPath (str) - field path
- Returns
value object
- Raises
FieldNotFound - when a part of the specified field path is not found
pv = PvObject({'aString' : STRING, 'aStruct' : {'anInt' : INT, 'aString2' : STRING}}) value = pv.getPyObject('aString') value2 = pv.getPyObject('aStruct.aString2')
-
getScalarArray
((PvObject)arg1) → list :¶ - getScalarArray() => list :
Retrieves scalar array value from a single-field structure, or from a structure that has scalar array field named ‘value’.
- Returns
list of scalar values
- Raises
InvalidRequest - when single-field structure has no scalar array field or multiple-field structure has no scalar array ‘value’ field
pv = PvObject({'aScalarArray' : [INT]}) valueList = pv.getScalarArray()
- getScalarArray((str)fieldName) => list :
Retrieves scalar array value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
list of scalar values
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a scalar array
Retrieves scalar array assigned to the given PV field.
pv = PvObject({'aScalarArray' : [INT]}) valueList = pv.getScalarArray('aScalarArray', 'aString' : STRING)
-
getSelectedUnionFieldName
((PvObject)arg1, (str)fieldName) → str :¶ - getSelectedUnionFieldName((str)fieldName) => str :
Retrieves selected field name for an union.
- Parameter
fieldName (str) - field name
- Returns
selected union field name
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) fieldName = pv.getSelectedUnionFieldName('anUnion')
- getSelectedUnionFieldName() => str :
Retrieves selected field name for an union from a single-field structure, or from a structure that has union field named ‘value’.
- Returns
selected union field name
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) fieldName = pv.getSelectedUnionFieldNames()
-
getShort
((PvObject)arg1) → int :¶ - getShort() => int :
Retrieves short value from a single-field structure, or from a structure that has short field named ‘value’.
- Returns
short value
- Raises
InvalidRequest - when single-field structure has no short field or multiple-field structure has no short ‘value’ field
pv = PvObject({'aShort' : SHORT}) value = pv.getShort()
- getShort((str)fieldName) => int :
Retrieves short value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
short value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a short
pv = PvObject({'aShort' : SHORT, 'aString' : STRING}) value = pv.getShort('aShort')
-
getString
((PvObject)arg1) → str :¶ - getString() => str :
Retrieves string value from a single-field structure, or from a structure that has string field named ‘value’.
- Returns
string value
- Raises
InvalidRequest - when single-field structure has no string field or multiple-field structure has no string ‘value’ field
pv = PvObject({'aString' : STRING}) value = pv.getString()
- getString((str)fieldName) => str :
Retrieves string value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
string value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a string
pv = PvObject({'aString' : STRING, 'anInt' : INT}) value = pv.getString('aString')
-
getStructure
((PvObject)arg1) → dict :¶ - getStructure() => dict :
Retrieves structure value from a single-field structure, or from a structure that has structure field named ‘value’.
- Returns
dictionary of structure key:value pairs
- Raises
InvalidRequest - when single-field structure has no structure field or multiple-field structure has no structure ‘value’ field
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}}) valueDict = pv.getStructure()
- getStructure((str)fieldName) => dict :
Retrieves structure value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
dictionary of structure key:value pairs
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a structure
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}, 'aString' : STRING}) valueDict = pv.getStructure('aStruct')
-
getStructureArray
((PvObject)arg1) → list :¶ - getStructureArray() => list :
Retrieves structure array value from a single-field structure, or from a structure that has structure array field named ‘value’.
- Returns
list of dictionaries
- Raises
InvalidRequest - when single-field structure has no structure array field or multiple-field structure has no structure array ‘value’ field
pv = PvObject({'aStructArray' : [{'anInt' : INT, 'aFloat' : FLOAT}]}) dictList = pv.getStructureArray()
- getStructureArray((str)fieldName) => list :
Retrieves structure array value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
list of dictionaries
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a structure array
pv = PvObject({'aStructArray' : [{'anInt' : INT, 'aFloat' : FLOAT}], 'aString' : STRING}) dictList = pv.getStructureArray('aStructArray')
-
getStructureDict
((PvObject)arg1) → dict :¶ - getStructureDict() => dict :
Retrieves PV structure definition as python dictionary.
- Returns
python key:value dictionary representing PV structure definition in terms of field names and their types (introspection dictionary)
structureDict = pv.getStructureDict()
-
getUByte
((PvObject)arg1) → int :¶ - getUByte() => int :
Retrieves unsigned byte (character) value from a single-field structure, or from a structure that has unsigned byte field named ‘value’.
- Returns
unsigned byte value
- Raises
InvalidRequest - when single-field structure has no unsigned byte field or multiple-field structure has no unsigned byte ‘value’ field
pv = PvObject({'anUByte' : UBYTE}) value = pv.getUByte()
- getUByte((str)fieldName) => int :
Retrieves unsigned byte (character) value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
unsigned byte value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned byte
pv = PvObject({'anUByte' : UBYTE, 'aString' : STRING}) value = pv.getUByte('anUByte')
-
getUInt
((PvObject)fieldName) → int :¶ - getUInt( (PvObject)fieldName) => int :
Retrieves unsigned int value from a single-field structure, or from a structure that has unsigned int field named ‘value’.
- Returns
unsigned integer value
- Raises
InvalidRequest - when single-field structure has no unsigned int field or multiple-field structure has no unsigned int ‘value’ field
pv = PvObject({'anUInt' : UINT}) value = pv.getUInt()
- getUInt((str)fieldName) => int :
Retrieves unsigned int value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
unsigned integer value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned int
pv = PvObject({'anUInt' : UINT, 'aString' : STRING}) value = pv.getUInt('anUInt')
-
getULong
((PvObject)arg1) → int :¶ - getULong() => int :
Retrieves unsigned long value from a single-field structure, or from a structure that has unsigned long field named ‘value’.
- Returns
unsigned long value
- Raises
InvalidRequest - when single-field structure has no unsigned long field or multiple-field structure has no unsigned long ‘value’ field
pv = PvObject({'anULong' : ULONG}) value = pv.getULong()
- getULong((str)fieldName) => int :
Retrieves unsigned long value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
unsigned long value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned long
pv = PvObject({'anULong' : ULONG, 'aString' : STRING}) value = pv.getULong('anULong')
-
getUShort
((PvObject)arg1) → int :¶ - getUShort() => int :
Retrieves unsigned short value from a single-field structure, or from a structure that has unsigned short field named ‘value’.
- Returns
unsigned short value
- Raises
InvalidRequest - when single-field structure has no unsigned short field or multiple-field structure has no unsigned short ‘value’ field
pv = PvObject({'anUShort' : USHORT}) value = pv.getUShort()
- getUShort((str)fieldName) => int :
Retrieves unsigned short value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
unsigned short value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned short
pv = PvObject({'anUShort' : USHORT, 'aString' : STRING}) value = pv.getUShort('anUShort')
-
getUnion
((PvObject)arg1) → PvObject :¶ - getUnion() => PvObject :
Retrieves union value from a single-field structure, or from a structure that has union field named ‘value’.
- Returns
union PV object
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) value = pv.getUnion()
- getUnion((str)fieldName) => PvObject :
Retrieves union assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
union PV object
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) value = pv.getUnion('anUnion')
-
getUnionArray
((PvObject)arg1) → list :¶ - getUnionArray() => list :
Retrieves union array value from a single-field structure, or from a structure that has union array field named ‘value’.
- Returns
list of union PV objects
- Raises
InvalidRequest - when single-field structure has no union array field or multiple-field structure has no union array ‘value’ field
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)]}) unionPvList = pv.getUnionArray()
- getUnionArray((str)fieldName) => list :
Retrieves union array value assigned to the given PV field.
- Parameter
fieldName (str) - field name
- Returns
list of union PV objects
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union array
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)], 'aString' : STRING}) unionPvList = pv.getUnionArray('anUnionArray')
-
getUnionArrayFieldNames
((PvObject)arg1, (str)fieldName) → list :¶ - getUnionArrayFieldNames((str)fieldName) => list :
Retrieves list of field names for an union array.
- Parameter
fieldName (str) - field name
- Returns
list of union array field names
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union array
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)], 'aString' : STRING}) fieldNameList = pv.getUnionArrayFieldNames('anUnionArray')
- getUnionArrayFieldNames() => list :
Retrieves list of union array field names from a single-field structure, or from a structure that has union array field named ‘value’.
- Returns
list of union array field names
- Raises
InvalidRequest - when single-field structure has no union array field or multiple-field structure has no union array ‘value’ field
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)]}) fieldNameList = pv.getUnionArrayFieldNames()
-
getUnionFieldNames
((PvObject)arg1, (str)fieldName) → list :¶ - getUnionFieldNames((str)fieldName) => list :
Retrieves list of field names for a union.
- Parameter
fieldName (str) - field name
- Returns
list of union field names
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) fieldNameList = pv.getUnionFieldNames('anUnion')
- getUnionFieldNames() => list :
Retrieves list of union field names from a single-field structure, or from a structure that has union field named ‘value’.
- Returns
list of union field names
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) fieldNameList = pv.getUnionFieldNames()
-
hasField
((PvObject)arg1, (str)fieldPath) → bool :¶ - hasField((str)fieldPath) => bool :
Checks if the PV object has field specified by the given path, using ‘.’ as the field name separator.
- Parameter
fieldPath (str) - field path
- Returns
true if path exists, false otherwise
pv = PvObject({'aString' : STRING, 'aStruct' : {'anInt' : INT, 'aString2' : STRING}}) hasField = pv.hasField('aString') hasField2 = pv.hasField('aString.anInt')
-
has_key
((PvObject)arg1, (str)fieldPath) → bool :¶ - has_key((str)fieldPath) => bool :
Checks if the PV object has field specified by the given path, using ‘.’ as the field name separator.
- Parameter
fieldPath (str) - field path
- Returns
true if path exists, false otherwise
pv = PvObject({'aString' : STRING, 'aStruct' : {'anInt' : INT, 'aString2' : STRING}}) hasField = pv.has_key('aString' hasField2 = pv.has_key('aStruct.anInt')
-
isUnionArrayVariant
((PvObject)arg1, (str)fieldName) → bool :¶ - isUnionArrayVariant((str)fieldName) => bool :
Checks if an union array assigned to a given field name is variant.
- Parameter
fieldName (str) - field name
- Returns
true if union array is variant, false otherwise
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union array
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)], 'aString' : STRING}) isVariant = pv.isUnionArrayVariant('anUnionArray')
- isUnionArrayVariant() => bool :
Checks if an union array from a single-field structure, or from a structure that has union array field named ‘value’, is variant.
- Returns
true if union array is variant, false otherwise
- Raises
InvalidRequest - when single-field structure has no union array field or multiple-field structure has no union array ‘value’ field
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)]}) isVariant = pv.isUnionArrayVariant()
-
isUnionVariant
((PvObject)arg1, (str)fieldName) → bool :¶ - isUnionVariant((str)fieldName) => bool :
Checks if an union assigned to a given field name is variant.
- Parameter
fieldName (str) - field name
- Returns
true if union is variant, false otherwise
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) isVariant = pv.isUnionVariant('anUnion')
- isUnionVariant() => bool :
Checks if an union from a single-field structure, or from a structure that has union field named ‘value’, is variant.
- Returns
true if union is variant, false otherwise
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) isVariant = pv.isUnionVariant()
-
items
((PvObject)arg1) → list :¶ - items() => list :
Returns list of PV object’s dictionary items.
- Returns
list of PV object’s dictionary (key,value) pairs
items = pv.items()
-
keys
((PvObject)arg1) → list :¶ - keys() => list :
Returns list of PV object’s dictionary keys (top level field names).
- Returns
list of PV object’s dictionary keys
keys = pv.keys()
-
selectUnionField
((PvObject)arg1, (str)fieldName, (str)unionFieldName) → PvObject :¶ - selectUnionField((str)fieldName, (str)unionFieldName) => PvObject :
Selects field for an union assigned to a given field name.
- Parameter
fieldName (str) - field name
- Parameter
unionFieldName (str) - union field name to be selected
- Returns
PV object for the selected union field
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) selectedPv = pv.selectUnionField('anUnion', 'anInt')
- selectUnionField((str)unionFieldName) => PvObject :
Selects field for an union from a single-field structure, or from a structure that has union field named ‘value’.
- Parameter
unionFieldName (str) - union field name to be selected
- Returns
PV object for the selected union field
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) selectedPv = pv.selectUnionField('anInt')
-
set
((PvObject)arg1, (dict)valueDict) → None :¶ - set((dict)valueDict) => None :
Populates PV structure fields from python dictionary.
- Parameter
valueDict (dict) - dictionary of key:value pairs that correspond to PV structure field names and their values
- Raises
FieldNotFound - in case PV structure does not have one of the dictionary keys
- Raises
InvalidDataType - in case PV structure field type does not match type of the corresponding dictionary value
pv = PvObject({'anUInt' : UINT, 'aString' : STRING}) pv.set({'anUInt' : 1, 'aString' : 'my string example'})
-
setBoolean
((PvObject)arg1, (object)value) → None :¶ - setBoolean((object)value) => None :
Sets boolean value for a single-field structure, or for a structure that has boolean field named ‘value’.
- Parameter
value (bool) - boolean value
- Raises
InvalidRequest - when single-field structure has no boolean field or multiple-field structure has no boolean ‘value’ field
pv = PvObject({'aBoolean' : BOOLEAN}) pv.setBoolean(True)
- setBoolean((str)fieldName, (object)value) => None :
Sets boolean value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (bool) - boolean value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a boolean
pv = PvObject({'aBoolean' : BOOLEAN, 'aString' : STRING}) pv.setBoolean('aBoolean', True)
-
setByte
((PvObject)arg1, (str)value) → None :¶ - setByte((str)value) => None :
Sets byte (character) value for a single-field structure, or for a structure that has byte field named ‘value’.
- Parameter
value (str) - byte value
- Raises
InvalidRequest - when single-field structure has no byte field or multiple-field structure has no byte ‘value’ field
pv = PvObject({'aByte' : BYTE}) pv.setByte('a')
- setByte((str)fieldName, (str)value) => None :
Sets byte (character) value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (str) - byte value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a byte
pv = PvObject({'aByte' : BYTE, 'aString' : STRING}) pv.setByte('aByte', 'a')
-
setDouble
((PvObject)arg1, (object)value) → None :¶ - setDouble((object)value) => None :
Sets double value for a single-field structure, or for a structure that has double field named ‘value’.
- Parameter
value (float) - double value
- Raises
InvalidRequest - when single-field structure has no double field or multiple-field structure has no double ‘value’ field
pv = PvObject({'aDouble' : DOUBLE}) pv.setDouble(10.0)
- setDouble((str)fieldName, (object)value) => None :
Sets short value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (float) - double value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a double
pv = PvObject({'aDouble' : DOUBLE, 'aString' : STRING}) pv.setDouble('aDouble', 10.0)
-
setFloat
((PvObject)arg1, (object)value) → None :¶ - setFloat((object)value) => None :
Sets float value for a single-field structure, or for a structure that has float field named ‘value’.
- Parameter
value (float) - float value
- Raises
InvalidRequest - when single-field structure has no float field or multiple-field structure has no float ‘value’ field
pv = PvObject({'aFloat' : FLOAT}) pv.setFloat(10.0)
- setFloat((str)fieldName, (object)value) => None :
Sets short value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (float) - float value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a short
pv = PvObject({'aFloat' : FLOAT, 'aString' : STRING}) pv.setFloat('aFloat', 10.0)
-
setInt
((PvObject)arg1, (object)value) → None :¶ - setInt((object)value) => None :
Sets int value for a single-field structure, or for a structure that has int field named ‘value’.
- Parameter
value (int) - integer value
- Raises
InvalidRequest - when single-field structure has no int field or multiple-field structure has no int ‘value’ field
pv = PvObject({'anInt' : INT}) pv.setInt(10)
- setInt((str)fieldName, (object)value) => None :
Sets int value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (int) - integer value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an int
pv = PvObject({'anInt' : INT, 'aString' : STRING}) pv.setInt('anInt', 10)
-
setLong
((PvObject)arg1, (int)value) → None :¶ - setLong((int)value) => None :
Sets long value for a single-field structure, or for a structure that has long field named ‘value’.
- Parameter
value (long) - long value
- Raises
InvalidRequest - when single-field structure has no long field or multiple-field structure has no long ‘value’ field
pv = PvObject({'aLong' : LONG}) pv.setLong(10L)
- setLong((str)fieldName, (int)value) => None :
Sets long value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (long) - long value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a long
pv = PvObject({'aLong' : LONG, 'aString' : STRING}) pv.setLong('aLong', 10L)
-
setPyObject
((PvObject)arg1, (object)value) → None :¶ - setPyObject((object)value) => None :
Sets value for a single-field structure, or for a structure that has field named ‘value’.
- Parameter
value (object) - value object
- Raises
InvalidRequest - when single-field structure has no field or multiple-field structure has no ‘value’ field
pv = PvObject({'aString' : STRING}) pv.setPyObject('string value')
- setPyObject((str)fieldPath, (object)value) => None :
Sets value for the PV field specified by the given field path, using ‘.’ as the field name separator.
- Parameter
fieldPath (str) - field path
- Parameter
value (object) - value object
- Raises
FieldNotFound - when a part of the specified field path is not found
- Raises
InvalidRequest - when specified field does not match provided object type
pv = PvObject({'aString' : STRING, 'aStruct' : {'anInt' : INT, 'aString2' : STRING}}) pv.setPyObject('aString', 'string value') pv.setPyObject('aString.aString2', 'string value2')
-
setScalarArray
((PvObject)arg1, (list)valueList) → None :¶ - setScalarArray((list)valueList) => None :
Sets scalar array value for a single-field structure, or for a structure that has scalar array field named ‘value’.
- Parameter
valueList (list) - list of scalar values
- Raises
InvalidRequest - when single-field structure has no scalar array field or multiple-field structure has no scalar array ‘value’ field
pv = PvObject({'aScalarArray' : [INT]}) pv.setScalarArray([0,1,2,3,4])
- setScalarArray((str)fieldName, (list)valueList) => None :
Sets scalar array value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueList (list) - list of scalar values
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a scalar array
pv = PvObject({'aScalarArray' : [INT], 'aString' : STRING}) pv.setScalarArray('aScalarArray', [0,1,2,3,4])
-
setShort
((PvObject)arg1, (object)value) → None :¶ - setShort((object)value) => None :
Sets short value for a single-field structure, or for a structure that has short field named ‘value’.
- Parameter
value (int) - short value’
- Raises
InvalidRequest - when single-field structure has no short field or multiple-field structure has no short ‘value’ field
pv = PvObject({'aShort' : SHORT}) pv.setShort(10)
- setShort((str)fieldName, (object)value) => None :
Sets short value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (int) - short value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a short
pv = PvObject({'aShort' : SHORT, 'aString' : STRING}) pv.setShort('aShort', 10)
-
setString
((PvObject)arg1, (str)value) → None :¶ - setString((str)value) => None :
Sets string value for a single-field structure, or for a structure that has string field named ‘value’.
- Parameter
value (str) - string value
- Raises
InvalidRequest - when single-field structure has no string field or multiple-field structure has no string ‘value’ field
pv = PvObject({'aString' : STRING}) pv.setString('string value')
- setString((str)fieldName, (str)value) => None :
Sets string value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (str) - string value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a string
pv = PvObject({'aString' : STRING, 'anInt' : INT}) pv.setString('aString', 'string value')
-
setStructure
((PvObject)arg1, (PvObject)valueObject) → None :¶ - setStructure((PvObject)valueObject) => None :
Sets structure value for a single-field structure, or for a structure that has structure field named ‘value’.
- Parameter
valueObject (PvObject) - PvObject instance
- Raises
InvalidRequest - when single-field structure has no structure field or multiple-field structure has no structure ‘value’ field
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}}) pv2 = PvObject({'anInt':INT, 'aDouble':DOUBLE}, {'anInt':1, 'aDouble':1.1}) pv.setStructure(pv2)
- setStructure((str)fieldName, (PvObject)valueObject) => None :
Sets structure value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueObject (PvObject) - PvObject instance
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a structure
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}, 'aString' : STRING}) pv2 = PvObject({'anInt':INT, 'aDouble':DOUBLE}, {'anInt':1, 'aDouble':1.1}) pv.setStructure('aStruct', pv2)
- setStructure((dict)valueDict) => None :
Sets structure value for a single-field structure, or for a structure that has structure field named ‘value’.
- Parameter
valueDict (dict) - dictionary of structure key:value pairs
- Raises
InvalidRequest - when single-field structure has no structure field or multiple-field structure has no structure ‘value’ field
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}}) pv.setStructure({'anInt' : 1, 'aDouble' : 1.1})
- setStructure((str)fieldName, (dict)valueDict) => None :
Sets structure value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueDict (dict) - dictionary of structure key:value pairs
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a structure
pv = PvObject({'aStruct' : {'anInt':INT, 'aDouble':DOUBLE}, 'aString' : STRING}) pv.setStructure('aStruct', {'anInt' : 1, 'aDouble' : 1.1})
-
setStructureArray
((PvObject)arg1, (list)dictList) → None :¶ - setStructureArray((list)dictList) => None :
Sets structure array value for a single-field structure, or for a structure that has structure array field named ‘value’.
- Parameter
dictList (list) - list of dictionaries
- Raises
InvalidRequest - when single-field structure has no structure array field or multiple-field structure has no structure array ‘value’ field
pv = PvObject({'aStructArray' : [{'anInt' : INT, 'aFloat' : FLOAT}]}) pv.setStructureArray([{'anInt' : 1, 'aFloat' : 1.1},{'anInt' : 2, 'aFloat' : 2.2},{'anInt' : 3, 'aFloat' : 3.3}])
- setStructureArray((str)fieldName, (list)dictList) => None :
Sets structure array value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
dictList (list) - list of dictionaries
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not a structure array
pv = PvObject({'aStructArray' : [{'anInt' : INT, 'aFloat' : FLOAT}], 'aString' : STRING}) pv.setStructureArray('aStructArray', [{'anInt' : 1, 'aFloat' : 1.1},{'anInt' : 2, 'aFloat' : 2.2},{'anInt' : 3, 'aFloat' : 3.3}])
-
setUByte
((PvObject)arg1, (object)value) → None :¶ - setUByte((object)value) => None :
Sets unsigned byte (character) value for a single-field structure, or for a structure that has unsigned byte field named ‘value’.
- Parameter
value (str) - unsigned byte value
- Raises
InvalidRequest - when single-field structure has no unsigned byte field or multiple-field structure has no unsigned byte ‘value’ field
pv = PvObject({'anUByte' : UBYTE}) pv.setUByte('a')
- setUByte((str)fieldName, (object)value) => None :
Sets unsigned byte (character) value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (str) - unsigned byte value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned byte
pv = PvObject({'anUByte' : UBYTE, 'aString' : STRING}) pv.setUByte('anUByte', 'a')
-
setUInt
((PvObject)arg1, (object)value) → None :¶ - setUInt((object)value) => None :
Sets unsigned int value for a single-field structure, or for a structure that has unsigned int field named ‘value’.
- Parameter
value (int) - unsigned integer value
- Raises
InvalidRequest - when single-field structure has no unsigned int field or multiple-field structure has no unsigned int ‘value’ field
pv = PvObject({'anUInt' : UINT}) pv.setUInt(10)
- setUInt((str)fieldName, (object)value) => None :
Sets unsigned int value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (int) - unsigned integer value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned int
pv = PvObject({'anUInt' : UINT, 'aString' : STRING}) pv.setUInt('anInt', 10)
-
setULong
((PvObject)arg1, (int)value) → None :¶ - setULong((int)value) => None :
Sets unsigned long value for a single-field structure, or for a structure that has unsigned long field named ‘value’.
- Parameter
value (long) - unsigned long value
- Raises
InvalidRequest - when single-field structure has no unsigned long field or multiple-field structure has no unsigned long ‘value’ field
pv = PvObject({'anULong' : ULONG}) pv.setULong(10L)
- setULong((str)fieldName, (int)value) => None :
Sets unsigned long value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (long) - unsigned long value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned long
pv = PvObject({'anULong' : ULONG, 'aString' : STRING}) pv.setULong('anULong', 10L)
-
setUShort
((PvObject)arg1, (object)value) → None :¶ - setUShort((object)value) => None :
Sets unsigned short value for a single-field structure, or for a structure that has unsigned short field named ‘value’.
- Parameter
value (int) - unsigned short value
- Raises
InvalidRequest - when single-field structure has no unsigned short field or multiple-field structure has no unsigned short ‘value’ field
pv = PvObject({'anUShort' : USHORT}) pv.setUShort(10)
- setUShort((str)fieldName, (object)value) => None :
Sets unsigned short value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
value (int) - unsigned short value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidRequest - when specified field is not an unsigned short
pv = PvObject({'anUShort' : USHORT, 'aString' : STRING}) pv.setUShort('anUShort', 10)
-
setUnion
((PvObject)arg1, (PvObject)valueObject) → None :¶ - setUnion((PvObject)valueObject) => None :
Sets union value for a single-field structure, or for a structure that has union field named ‘value’.
- Parameter
valueObject (PvObject) - union value
- Raises
InvalidArgument - when object’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) value = PvObject({'anInt' : INT}) value.setInt(10) pv.setUnion(value)
- setUnion((str)fieldName, (PvObject)valueObject) => None :
Sets union value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueObject (PvObject) - union value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidArgument - when object’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when specified field is not a union
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) value = PvObject({'anInt' : INT}) value.setInt(10) pv.setUnion('anUnion', value)
- setUnion((dict)valueDict) => None :
Sets union value for a single-field structure, or for a structure that has union field named ‘value’.
- Parameter
valueDict (dict) - union value
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) pv.setUnion({'anInt' : 10})
- setUnion((str)fieldName, (dict)valueDict) => None :
Sets union for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueDict (dict) - union value
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) pv.setUnion('anUnion', {'anInt' : 10})
- setUnion((tuple)valueDict) => None :
Sets union value for a single-field structure, or for a structure that has union field named ‘value’.
- Parameter
valueTuple (tuple) - union value, must contain dictionary as its only element
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},)}) pv.setUnion(({'anInt' : 10},))
- setUnion((str)fieldName, (tuple)valueTuple) => None :
Sets union for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
valueTuple (tuple) - union value, must contain dictionary as its only element
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union field or multiple-field structure has no union ‘value’ field
pv = PvObject({'anUnion' : ({'anInt' : INT, 'aFloat' : FLOAT},), 'aString' : STRING}) pv.setUnion('anUnion', ({'anInt' : 10},)
-
setUnionArray
((PvObject)arg1, (list)objectList) → None :¶ - setUnionArray((list)objectList) => None :
Sets union array value for a single-field structure, or for a structure that has union array field named ‘value’.
- Parameter
objectList (list) - list of PV objects, dictionaries, or tuples representing unions
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when single-field structure has no union array field or multiple-field structure has no union array ‘value’ field
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)]}) pv.setUnionArray([{'anInt' : 10}, {'aFloat' : 11.1}])
- setUnionArray((str)fieldName, (list)objectList) => None :
Sets union array value for the given PV field.
- Parameter
fieldName (str) - field name
- Parameter
objectList (list) - list of PV objects, dictionaries, or tuples representing unions
- Raises
FieldNotFound - when PV structure does not have specified field
- Raises
InvalidArgument - when dictionary’s field name/type do not match any of the union’s fields
- Raises
InvalidRequest - when specified field is not an union array
pv = PvObject({'anUnionArray' : [({'anInt' : INT, 'aFloat' : FLOAT},)], 'aString' : STRING}) pv.setUnionArray('anUnionArray', [{'anInt' : 10}, {'aFloat' : 11.1}])
-
toDict
((PvObject)arg1) → dict :¶ - toDict() => dict :
Converts PV structure to python dictionary.
- Returns
python key:value dictionary representing current PV structure in terms of field names and their values
valueDict = pv.toDict()
Note that one can also convert PvObject instances to dictionaries using the standard dict() constructor:
valueDict = dict(pv)
-
property
useNumPyArrays
¶
-
values
((PvObject)arg1) → list :¶ - values() => list :
Returns list of PV object’s dictionary values (top level field values).
- Returns
list of PV object’s dictionary values
values = pv.values()
PvScalar¶
-
class
pvaccess.
PvScalar
¶ Bases:
pvaccess.PvObject
PvScalar is a base class for all scalar PV types. It cannot be instantiated directly from python.
PvBoolean¶
-
class
pvaccess.
PvBoolean
¶ Bases:
pvaccess.PvScalar
PvBoolean represents PV boolean type.
PvBoolean([value=False])
- Parameter
value (bool) - boolean value
pv = PvBoolean(True)
-
get
((PvBoolean)arg1) → bool :¶ - get() => bool :
Retrieves boolean PV value.
- Returns
boolean value
value = pv.get()
-
set
((PvBoolean)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets boolean PV value.
- Parameter
value (bool) - boolean value
pv.set(False)
PvByte¶
-
class
pvaccess.
PvByte
¶ Bases:
pvaccess.PvScalar
PvByte represents PV byte type.
PvByte([value=’’])
- Parameter
value (str) - byte value
pv = PvByte('a')
-
get
((PvByte)arg1) → str :¶ - get() => str :
Retrieves byte PV value.
- Returns
byte value
value = pv.get()
-
set
((PvByte)arg1, (str)value) → None :¶ - set((str)value) => None :
Sets byte PV value.
- Parameter
value (str) - byte value
pv.set('a')
PvUByte¶
-
class
pvaccess.
PvUByte
¶ Bases:
pvaccess.PvScalar
PvUByte represents PV unsigned byte type.
PvUByte([value=0])
- Parameter
value (int) - unsigned byte value
pv = PvUByte(10)
-
get
((PvUByte)arg1) → int :¶ - get() => int :
Retrieves unsigned byte PV value.
- Returns
unsigned byte value
value = pv.get()
-
set
((PvUByte)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets unsigned byte PV value.
- Parameter
value (int) - unsigned byte value
pv.set(10)
PvShort¶
-
class
pvaccess.
PvShort
¶ Bases:
pvaccess.PvScalar
PvShort represents PV short type.
PvShort([value=0])
- Parameter
value (int) - short value
pv = PvShort(-10)
-
get
((PvShort)arg1) → int :¶ - get() => int :
Retrieves short PV value.
- Returns
short value
value = pv.get()
-
set
((PvShort)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets short PV value.
- Parameter
value (int) - short value
pv.set(-10)
PvUShort¶
-
class
pvaccess.
PvUShort
¶ Bases:
pvaccess.PvScalar
PvUShort represents PV unsigned short type.
PvUShort([value=0])
- Parameter
value (int) - unsigned short value
pv = PvUShort(10)
-
get
((PvUShort)arg1) → int :¶ - get() => int :
Retrieves unsigned short PV value.
- Returns
unsigned short value
value = pv.get()
-
set
((PvUShort)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets unsigned short PV value.
- Parameter
value (int) - unsigned short value
pv.set(10)
PvInt¶
-
class
pvaccess.
PvInt
¶ Bases:
pvaccess.PvScalar
PvInt represents PV integer type.
PvInt([value=0])
- Parameter
value (int) - integer value
pv = PvInt(-1000)
-
get
((PvInt)arg1) → int :¶ - get() => int :
Retrieves integer PV value.
- Returns
integer value
value = pv.get()
-
set
((PvInt)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets integer PV value.
- Parameter
value (int) - integer value
pv.set(-1000)
PvUInt¶
-
class
pvaccess.
PvUInt
¶ Bases:
pvaccess.PvScalar
PvUInt represents PV unsigned int type.
PvUInt([value=0])
- Parameter
value (int) - unsigned integer value
pv = PvUInt(1000)
-
get
((PvUInt)arg1) → int :¶ - get() => int :
Retrieves unsigned integer PV value.
- Returns
unsigned integer value
value = pv.get()
-
set
((PvUInt)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets unsigned integer PV value.
- Parameter
value (int) - unsigned integer value
pv.set(1000)
PvLong¶
-
class
pvaccess.
PvLong
¶ Bases:
pvaccess.PvScalar
PvLong represents PV long type.
PvLong([value=0])
- Parameter
value (long) - long value
pv = PvLong(-100000L)
-
get
((PvLong)arg1) → int :¶ - get() => int :
Retrieves long PV value.
- Returns
long value
value = pv.get()
-
set
((PvLong)arg1, (int)arg2) → None :¶ - set((int)arg2) => None :
Sets long PV value.
- Parameter
value (long) - long value
pv.set(-100000L)
PvULong¶
-
class
pvaccess.
PvULong
¶ Bases:
pvaccess.PvScalar
PvULong represents PV unsigned long type.
PvULong([value=0])
- Parameter
value (long) - unsigned long value
pv = PvULong(100000L)
-
get
((PvULong)arg1) → int :¶ - get() => int :
Retrieves unsigned long PV value.
- Returns
unsigned long value
value = pv.get()
-
set
((PvULong)arg1, (int)value) → None :¶ - set((int)value) => None :
Sets unsigned long PV value.
- Parameter
value (long) - unsigned long value
pv.set(100000L)
PvFloat¶
-
class
pvaccess.
PvFloat
¶ Bases:
pvaccess.PvScalar
PvFloat represents PV float type.
PvFloat([value=0])
- Parameter
value (float) - float value
pv = PvFloat(1.1)
-
get
((PvFloat)arg1) → float :¶ - get() => float :
Retrieves float PV value.
- Returns
float value
value = pv.get()
-
set
((PvFloat)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets float PV value.
- Parameter
value (float) - float value
pv.set(1.1)
PvDouble¶
-
class
pvaccess.
PvDouble
¶ Bases:
pvaccess.PvScalar
PvDouble represents PV double type.
PvDouble([value=0])
- Parameter
value (float) - double value
pv = PvDouble(1.1)
-
get
((PvDouble)arg1) → float :¶ - get() => float :
Retrieves double PV value.
- Returns
double value
value = pv.get()
-
set
((PvDouble)arg1, (object)value) → None :¶ - set((object)value) => None :
Sets double PV value.
- Parameter
value (float) - double value
pv.set(1.1)
PvString¶
-
class
pvaccess.
PvString
¶ Bases:
pvaccess.PvScalar
PvString represents PV string type.
PvString([value=’’])
- Parameter
value (str) - string value
pv = PvString('stringValue')
-
get
((PvString)arg1) → str :¶ - get() => str :
Retrieves string PV value.
- Returns
string value
value = pv.get()
-
set
((PvString)arg1, (str)value) → None :¶ - set((str)value) => None :
Sets string PV value.
- Parameter
value (str) - string value
pv.set('stringValue')
PvScalarArray¶
-
class
pvaccess.
PvScalarArray
¶ Bases:
pvaccess.PvObject
PvScalarArray represents PV scalar array.
PvScalarArray(scalarType)
- Parameter
scalarType (PVTYPE) - scalar type of array elements
PVTYPE: scalar type, can be BOOLEAN, BYTE, UBYTE, SHORT, USHORT, INT, UINT, LONG, ULONG, FLOAT, DOUBLE, or STRING
pv = PvScalarArray(INT)
-
get
((PvScalarArray)arg1) → list :¶ - get() => list :
Retrieves PV value list.
- Returns
list of scalar values
valueList = pv.get()
-
set
((PvScalarArray)arg1, (list)valueList) → None :¶ - set((list)valueList) => None :
Sets PV value list.
- Parameter
valueList (list) - list of scalar values
pv.set([1,2,3,4,5])
-
toList
((PvScalarArray)arg1) → list :¶ - toList() => list :
Converts PV to value list.
- Returns
list of scalar values
valueList = pv.toList()
PvTimeStamp¶
-
class
pvaccess.
PvTimeStamp
¶ Bases:
pvaccess.PvObject
PvTimeStamp represents PV time stamp structure.
PvTimeStamp()
timestamp1 = PvTimeStamp()
PvTimeStamp(secondsPastEpoch, nanoseconds [, userTag=-1])
- Parameter
secondsPastEpoch (long) - seconds past epoch
- Parameter
nanoseconds (int) - nanoseconds
- Parameter
userTag (int) - user tag
timeStamp2 = PvTimeStamp(1234567890, 10000) timeStamp3 = PvTimeStamp(1234567890, 10000, 1)
-
getNanoseconds
((PvTimeStamp)arg1) → int :¶ - getNanoseconds() => int :
Retrieves time stamp value for nanoseconds.
- Returns
nanoseconds
nanoseconds = timeStamp.getNanoseconds()
-
getSecondsPastEpoch
((PvTimeStamp)arg1) → int :¶ - getSecondsPastEpoch() => int :
Retrieves time stamp value for seconds past epoch.
- Returns
seconds past epoch
secondsPastEpoch = timeStamp.getSecondsPastEpoch()
-
getUserTag
((PvTimeStamp)arg1) → int :¶ - getUserTag() => int :
Retrieves user tag.
- Returns
user tag
userTag = timeStamp.getUserTag()
-
setNanoseconds
((PvTimeStamp)arg1, (object)nanoseconds) → None :¶ - setNanoseconds((object)nanoseconds) => None :
Sets time stamp value for nanoseconds.
- Parameter
nanoseconds (int) - nanoseconds
timeStamp.setNanoseconds(10000)
-
setSecondsPastEpoch
((PvTimeStamp)arg1, (int)secondsPastEpoch) → None :¶ - setSecondsPastEpoch((int)secondsPastEpoch) => None :
Sets time stamp value for seconds past epoch.
- Parameter
secondsPastEpoch (long) - seconds past epoch
timeStamp.setSecondsPastEpoch(1234567890)
-
setUserTag
((PvTimeStamp)arg1, (object)userTag) → None :¶ - setUserTag((object)userTag) => None :
Sets user tag.
- Parameter
userTag (int) - user tag
timeStamp.setUserTag(1)
PvAlarm¶
-
class
pvaccess.
PvAlarm
¶ Bases:
pvaccess.PvObject
PvAlarm represents PV alarm structure.
PvAlarm()
alarm1 = PvAlarm()
PvAlarm(severity, status, message)
- Parameter
severity (int) - alarm severity
- Parameter
status (int) - status code
- Parameter
message (str) - alarm message
alarm2 = PvAlarm(5, 1, 'alarm message')
-
getMessage
((PvAlarm)arg1) → str :¶ - getMessage() => str :
Retrieves alarm message.
- Returns
alarm message
message = alarm.getMessage()
-
getSeverity
((PvAlarm)arg1) → int :¶ - getSeverity() => int :
Retrieves alarm severity.
- Returns
alarm severity
severity = alarm.getSeverity()
-
getStatus
((PvAlarm)arg1) → int :¶ - getStatus() => int :
Retrieves status code.
- Returns
status code
status = alarm.getStatusCode()
-
setMessage
((PvAlarm)arg1, (str)message) → None :¶ - setMessage((str)message) => None :
Sets alarm message.
- Parameter
message (str) - alarm message
alarm.setmessage('alarm message')
-
setSeverity
((PvAlarm)arg1, (object)severity) → None :¶ - setSeverity((object)severity) => None :
Sets alarm severity.
- Parameter
severity (int) - alarm severity
alarm.setSeverity(1)
-
setStatus
((PvAlarm)arg1, (object)status) → None :¶ - setStatus((object)status) => None :
Sets status code.
- Parameter
status (int) - status code
alarm.setStatus(1)
NtType¶
-
class
pvaccess.
NtType
¶ Bases:
pvaccess.PvObject
NtType is a base class for all NT structures. It cannot be instantiated directly from python.
NtTable¶
-
class
pvaccess.
NtTable
¶ Bases:
pvaccess.NtType
NtTable represents NT table structure.
NtTable(nColumns, scalarType)
- Parameter
nColumns (int) - number of table columns
- Parameter
scalarType (PVTYPE) - scalar type (BOOLEAN, BYTE, UBYTE, SHORT, USHORT, INT, UINT, LONG, ULONG, FLOAT, DOUBLE, or STRING)
This example creates NT Table with 3 columns of DOUBLE values:
table1 = NtTable(3, DOUBLE)
NtTable(scalarTypeList)
- Parameter
scalarTypeList ([PVTYPE]) - list of column scalar types (BOOLEAN, BYTE, UBYTE, SHORT, USHORT, INT, UINT, LONG, ULONG, FLOAT, DOUBLE, or STRING)
This example creates NT Table with STRING, INT and DOUBLE columns:
table2 = NtTable([STRING, INT, DOUBLE])
NtTable(pvObject)
- Parameter
pvObject (PvObject) - PV object that has a structure containing required NT Table elements:
labels ([STRING]) - list of column labels
value (dict) - dictionary of column<index>:[PVTYPE] pairs, where <index> is an integer in range [0,N-1], with N being NT Table dimension
The following example creates NT Table with 3 DOUBLE columns:
pvObject = PvObject({'labels' : [STRING], 'value' : {'column0' : [DOUBLE], 'column1' : [DOUBLE], 'column2' : [DOUBLE]}}) pvObject.setScalarArray('labels', ['x', 'y', 'z']) pvObject.setStructure('value', {'column0' : [0.1, 0.2, 0.3], 'column1' : [1.1, 1.2, 1.3], 'column2' : [2.1, 2.2, 2.3]}) table3 = NtTable(pvObject)
-
getAlarm
((NtTable)arg1) → PvAlarm :¶ - getAlarm() => PvAlarm :
Retrieves table alarm.
- Returns
table alarm object
alarm = table.getAlarm()
-
getColumn
((NtTable)arg1, (object)index) → list :¶ - getColumn((object)index) => list :
Retrieves specified column.
- Parameter
index (int) - column index (must be in range [0,N-1], where N is the number of table columns)
- Returns
list of values stored in the specified table column
valueList = table.getColumn(0)
-
getDescriptor
((NtTable)arg1) → str :¶ - getDescriptor() => str :
Retrieves table descriptor.
- Returns
table descriptor
descriptor = table.getDescriptor()
-
getLabels
((NtTable)arg1) → list :¶ - getLabels() => list :
Retrieves list of column labels.
- Returns
list of column labels
labelList = table.getLabels()
-
getNColumns
((NtTable)arg1) → int :¶ - getNColumns() => int :
Retrieves number of columns.
- Returns
number of table columns
nColumns = table.getNColumns()
-
getTimeStamp
((NtTable)arg1) → PvTimeStamp :¶ - getTimeStamp() => PvTimeStamp :
Retrieves table time stamp.
- Returns
table time stamp object
timeStamp = table.getTimeStamp()
-
setAlarm
((NtTable)arg1, (PvAlarm)alarm) → None :¶ - setAlarm((PvAlarm)alarm) => None :
Sets table alarm.
- Parameter
alarm (PvAlarm) - table alarm object
alarm = PvAlarm(11, 126, 'Server SegFault') table.setAlarm(alarm)
-
setColumn
((NtTable)arg1, (object)index, (list)valueList) → None :¶ - setColumn((object)index, (list)valueList) => None :
Sets column values.
- Parameter
index (int) - column index
- Parameter
valueList (list) - list of column values
table.setColumn(0, ['x', 'y', 'z'])
-
setDescriptor
((NtTable)arg1, (str)descriptor) → None :¶ - setDescriptor((str)descriptor) => None :
Sets table descriptor.
- Parameter
descriptor (str) - table descriptor
table.setDescriptor('myTable')
-
setLabels
((NtTable)arg1, (list)labelList) → None :¶ - setLabels((list)labelList) => None :
Sets column labels.
- Parameter
labelList ([str]) - list of strings containing column labels (the list length must match number of table columns)
table.setLabels(['String', 'Int', 'Double'])
-
setTimeStamp
((NtTable)arg1, (PvTimeStamp)timeStamp) → None :¶ - setTimeStamp((PvTimeStamp)timeStamp) => None :
Sets table time stamp.
- Parameter
timeStamp (PvTimeStamp) - table time stamp object
timeStamp = PvTimeStamp(1234567890, 10000, 1) table.setTimeStamp(timeStamp)
Channel¶
-
class
pvaccess.
Channel
¶ Bases:
Boost.Python.instance
This class represents PV channels.
Channel(name [, providerType=PVA])
- Parameter
name (str) - channel name
- Parameter
providerType (PROVIDERTYPE) - provider type, either PVA (PV Access) or CA (Channel Access)
Note that PV structures representing objects on CA channels always have a single key ‘value’. The following example creates PVA channel ‘enum01’:
pvaChannel = Channel('enum01')
This example allows access to CA channel ‘CA:INT’:
caChannel = Channel('CA:INT', CA)
-
get
((Channel)arg1, (str)requestDescriptor) → PvObject :¶ - get((str)requestDescriptor) => PvObject :
Retrieves PV data from the channel.
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data corresponding to the specified request descriptor
channel = Channel('enum01') pv = channel.get('field(value.index)')
- get() => PvObject :
Retrieves PV data from the channel using the default request descriptor ‘field(value)’.
- Returns
channel PV data
pv = channel.get()
-
getIntrospectionDict
((Channel)arg1) → dict :¶ - getIntrospectionDict() => dict :
Retrieves PV structure definition as python dictionary.
- Returns
python key:value dictionary representing PV structure definition in terms of field names and their types (introspection dictionary)
introspectionDict = channel.getIntrospectionDict()
-
getMonitorMaxQueueLength
((Channel)arg1) → int :¶ - getMonitorMaxQueueLength() => int :
Retrieves maximum monitor queue length.
- Returns
maximum monitor queue length
maxQueueLength = channel.getMonitorMaxQueueLength()
-
getName
((Channel)arg1) → str :¶ - getName() => str :
Get channel name.
- Returns
channel name
cName = channel.getName()
-
getPut
((Channel)arg1, (str)requestDescriptor) → PvObject :¶ - getPut((str)requestDescriptor) => PvObject :
Retrieves put PV data from the channel.
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel put PV data corresponding to the specified request descriptor
channel = Channel('enum01') pv = channel.getPut('field(value.index)')
- getPut() => PvObject :
Retrieves put PV data from the channel using the default request descriptor ‘field(value)’.
- Returns
channel put PV data
pv = channel.getPut()
-
getTimeout
((Channel)arg1) → float :¶ - getTimeout() => float :
Retrieves channel timeout.
- Returns
channel timeout in seconds
timeout = channel.getTimeout()
-
isMonitorActive
((Channel)arg1) → bool :¶ - isMonitorActive() => bool :
Determines whether or not channel monitor is active.
- Returns
True if monitor is active, false otherwise
monitorActive = channel.isMonitorActive()
-
monitor
((Channel)arg1, (object)subscriber[, (str)requestDescriptor=field(value)]) → None :¶ - monitor((object)subscriber [, (str)requestDescriptor=field(value)]) => None :
Subscribes python object to notifications of changes in PV value and starts channel monitor. This method is appropriate when there is only one subscriber.
- Parameter
subscriber (object) - reference to python subscriber object (e.g., python function) that will be executed when PV value changes
- Parameter
requestDescriptor (str) - describes what PV data should be sent to subscribed channel clients
def echo(x): print 'New PV value: ', x channel.monitor(echo, 'field(value,alarm,timeStamp)')
-
put
((Channel)arg1, (PvObject)pvObject, (str)requestDescriptor) → None :¶ - put((PvObject)pvObject, (str)requestDescriptor) => None :
Assigns PV data to the channel process variable.
- Parameter
pvObject (PvObject) - PV object that will be assigned to channel PV according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
channel = Channel('enum01') channel.put(PvInt(1), 'field(value.index)')
- put((PvObject)pvObject) => None :
Assigns PV data to the channel process variable using the default request descriptor ‘field(value)’.
- Parameter
pvObject (PvObject) - PV object that will be assigned to the channel process variable
channel = Channel('exampleInt') channel.put(PvInt(1))
- put((list)valueList, (str)requestDescriptor) => None :
Assigns scalar array data to the channel PV according to the specified request descriptor.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- put((list)valueList) => None :
Assigns scalar array data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
channel = Channel('intArray01') channel.put([0,1,2,3,4])
- put((object)value, (str)requestDescriptor) => None :
Assigns float data to the channel PV.
- Parameter
value (float) - float value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns float data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (float) - float value that will be assigned to the channel PV
channel = Channel('exampleFloat') channel.put(1.1)
- put((object)value, (str)requestDescriptor) => None :
Assigns double data to the channel PV.
- Parameter
value (float) - double value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Puts double data into the channel using the default request descriptor ‘field(value)’.
- Parameter
value (float) - double value that will be assigned to the channel PV
channel = Channel('double01') channel.put(1.1)
- put((object)value, (str)requestDescriptor) => None :
Assigns boolean data to the channel PV.
- Parameter
value (bool) - boolean value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns boolean data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (bool) - boolean value that will be assigned to the channel PV
channel = Channel('boolean01') channel.put(True)
- put((object)value, (str)requestDescriptor) => None :
Assigns unsigned byte data to the channel PV.
- Parameter
value (int) - unsigned byte value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned byte value that will be assigned to the channel PV
channel = Channel('ubyte01') channel.put(10)
- put((str)value, (str)requestDescriptor) => None :
Assigns byte data to the channel PV.
- Parameter
value (int) - byte value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((str)value) => None :
Assigns byte data to the channel using the default request descriptor ‘field(value)’.
- Parameter
value (int) - byte value that will be assigned to the channel PV
channel = Channel('byte01') channel.put(-10)
- put((object)value, (str)requestDescriptor) => None :
Assigns unsigned short data to the channel PV.
- Parameter
value (int) - unsigned short value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns unsigned short data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned short value that will be assigned to the channel PV
channel = Channel('ushort01') channel.put(10)
- put((object)value, (str)requestDescriptor) => None :
Assigns short data to the channel PV.
- Parameter
value (int) - short value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns short data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - short value that will be assigned to the channel PV
channel = Channel('short01') channel.put(10)
- put((object)value, (str)requestDescriptor) => None :
Assigns unsigned integer data to the channel PV.
- Parameter
value (int) - unsigned integer value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns unsigned integer data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned integer value that will be assigned to the channel PV
channel = Channel('uexampleInt') channel.putUInt(1000)
- put((object)value, (str)requestDescriptor) => None :
Assigns integer data to the channel PV.
- Parameter
value (int) - integer value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((object)value) => None :
Assigns integer data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - integer value that will be assigned to the channel PV
channel = Channel('exampleInt') channel.put(1000)
- put((int)value, (str)requestDescriptor) => None :
Assigns unsigned long data to the channel PV.
- Parameter
value (long) - unsigned long value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((int)value) => None :
Assigns unsigned long data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (long) - unsigned long value that will be assigned to the channel PV
channel = Channel('ulong01') channel.put(100000L)
- put((int)value, (str)requestDescriptor) => None :
Assigns long data to the channel PV.
- Parameter
value (long) - long value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((int)value) => None :
Assigns long data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (long) - long value that will be assigned to the channel PV
channel = Channel('long01') channel.put(100000L)
- put((str)value, (str)requestDescriptor) => None :
Assigns string data to the channel PV.
- Parameter
value (str) - string value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- put((str)value) => None :
Assigns string data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (str) - string value that will be assigned to the channel PV
channel = Channel('string01') channel.put('string value')
-
putBoolean
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putBoolean((object)value, (str)requestDescriptor) => None :
Assigns boolean data to the channel PV.
- Parameter
value (bool) - boolean value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putBoolean((object)value) => None :
Assigns boolean data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (bool) - boolean value that will be assigned to the channel PV
channel = Channel('boolean01') channel.putBoolean(True)
-
putByte
((Channel)arg1, (str)value, (str)requestDescriptor) → None :¶ - putByte((str)value, (str)requestDescriptor) => None :
Assigns byte data to the channel PV.
- Parameter
value (int) - byte value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putByte((str)value) => None :
Assigns byte data to the channel using the default request descriptor ‘field(value)’.
- Parameter
value (int) - byte value that will be assigned to the channel PV
channel = Channel('byte01') channel.putByte(-10)
-
putDouble
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putDouble((object)value, (str)requestDescriptor) => None :
Assigns double data to the channel PV.
- Parameter
value (float) - double value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putDouble((object)value) => None :
Puts double data into the channel using the default request descriptor ‘field(value)’.
- Parameter
value (float) - double value that will be assigned to the channel PV
channel = Channel('double01') channel.putDouble(1.1)
-
putFloat
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putFloat((object)value, (str)requestDescriptor) => None :
Assigns float data to the channel PV.
- Parameter
value (float) - float value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putFloat((object)value) => None :
Assigns float data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (float) - float value that will be assigned to the channel PV
channel = Channel('exampleFloat') channel.putFloat(1.1)
-
putGet
((Channel)arg1, (PvObject)pvObject, (str)requestDescriptor) → PvObject :¶ - putGet((PvObject)pvObject, (str)requestDescriptor) => PvObject :
Assigns PV data to the channel process variable and returns new PV value.
- Parameter
pvObject (PvObject) - PV object that will be assigned to channel PV according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data corresponding to the specified request descriptor
channel = Channel('exampleInt') pv = channel.putGet(PvInt(1), 'putField(value)getField(value)')
- putGet((PvObject)pvObject) => PvObject :
Assigns PV data to the channel process variable and returns new PV value.
- Parameter
pvObject (PvObject) - PV object that will be assigned to channel PV according to the default request descriptor ‘putField(value)getField(value)’
- Returns
channel PV data
channel = Channel('exampleInt') pv = channel.putGet(PvInt(1))
- putGet((list)valueList, (str)requestDescriptor) => PvObject :
Assigns scalar array data to the channel process variable and returns new PV value.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
channel = Channel('exampleIntArray') pv = channel.putGet([0,1,2,3,4], 'putField(value)getField(value)')
- putGet((list)valueList) => PvObject :
Assigns scalar array data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleIntArray') pv = channel.putGet([0,1,2,3,4], 'putField(value)getField(value)')
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns float data to the channel PV and returns new PV value.
- Parameter
value (float) - float value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns float data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (float) - float value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleFloat') pv = channel.putGet(-1.1)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns double data to the channel PV and returns new PV value.
- Parameter
value (float) - double value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns double data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (float) - double value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleDouble') pv = channel.putGet(-1.1)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns boolean data to the channel PV and returns new PV value.
- Parameter
value (bool) - boolean value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns boolean data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (bool) - boolean value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleBoolean') pv = channel.putGet(True)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned byte value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned byte value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUByte') pv = channel.putGet(-10)
- putGet((str)value, (str)requestDescriptor) => PvObject :
Assigns byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - byte value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((str)value) => PvObject :
Assigns byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - byte value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleByte') pv = channel.putGet(-10)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned short data to the channel PV and returns new PV value.
- Parameter
value (int) - short value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns unsigned short data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned short value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUShort') pv = channel.putGet(1000)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns short data to the channel PV and returns new PV value.
- Parameter
value (int) - short value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns short data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - short value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleShort') pv = channel.putGet(-1000)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned int data to the channel PV and returns new PV value.
- Parameter
value (int) - int value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns unsigned int data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned int value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUInt') pv = channel.putGet(1000)
- putGet((object)value, (str)requestDescriptor) => PvObject :
Assigns int data to the channel PV and returns new PV value.
- Parameter
value (int) - int value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((object)value) => PvObject :
Assigns int data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - int value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleInt') pv = channel.putGet(1000)
- putGet((int)value, (str)requestDescriptor) => PvObject :
Assigns unsigned long data to the channel PV and returns new PV value.
- Parameter
value (long) - unsigned long value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((int)value) => PvObject :
Assigns unsigned long data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (long) - unsigned long value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleULong') pv = channel.putGet(1000L)
- putGet((int)value, (str)requestDescriptor) => PvObject :
Assigns long data to the channel PV and returns new PV value.
- Parameter
value (long) - long value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGet((int)value) => PvObject :
Assigns long data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (long) - long value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleLong') pv = channel.putGet(-1000L)
- putGet((str)value, (str)requestDescriptor) => PvObject :
Assigns string data to the channel process variable and returns new PV value.
- Parameter
value (str) - string value that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
channel = Channel('exampleString') pv = channel.putGet('string value', 'putField(value)getField(value)')
- putGet((str)value) => PvObject :
Assigns string data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (str) - string value that will be assigned to the channel PV’
- Returns
channel PV data
channel = Channel('exampleString') pv = channel.putGet('string value')
-
putGetBoolean
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetBoolean((object)value, (str)requestDescriptor) => PvObject :
Assigns boolean data to the channel PV and returns new PV value.
- Parameter
value (bool) - boolean value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetBoolean((object)value) => PvObject :
Assigns boolean data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (bool) - boolean value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleBoolean') pv = channel.putGetBoolean(True)
-
putGetByte
((Channel)arg1, (str)value, (str)requestDescriptor) → PvObject :¶ - putGetByte((str)value, (str)requestDescriptor) => PvObject :
Assigns byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - byte value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetByte((str)value) => PvObject :
Assigns byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - byte value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleByte') pv = channel.putGetByte(-10)
-
putGetDouble
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetDouble((object)value, (str)requestDescriptor) => PvObject :
Assigns double data to the channel PV and returns new PV value.
- Parameter
value (float) - double value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetDouble((object)value) => PvObject :
Assigns double data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (float) - double value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleDouble') pv = channel.putGetDouble(-1.1)
-
putGetFloat
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetFloat((object)value, (str)requestDescriptor) => PvObject :
Assigns float data to the channel PV and returns new PV value.
- Parameter
value (float) - float value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetFloat((object)value) => PvObject :
Assigns float data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (float) - float value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleFloat') pv = channel.putGetFloat(-1.1)
-
putGetInt
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetInt((object)value, (str)requestDescriptor) => PvObject :
Assigns int data to the channel PV and returns new PV value.
- Parameter
value (int) - int value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetInt((object)value) => PvObject :
Assigns int data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - int value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleInt') pv = channel.putGetInt(1000)
-
putGetLong
((Channel)arg1, (int)value, (str)requestDescriptor) → PvObject :¶ - putGetLong((int)value, (str)requestDescriptor) => PvObject :
Assigns long data to the channel PV and returns new PV value.
- Parameter
value (long) - long value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetLong((int)value) => PvObject :
Assigns long data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (long) - long value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleLong') pv = channel.putGetLong(-1000L)
-
putGetScalarArray
((Channel)arg1, (list)valueList, (str)requestDescriptor) → PvObject :¶ - putGetScalarArray((list)valueList, (str)requestDescriptor) => PvObject :
Assigns scalar array data to the channel process variable and returns new PV value.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
channel = Channel('exampleIntArray') pv = channel.putGetScalarArray([0,1,2,3,4], 'putField(value)getField(value)')
- putGetScalarArray((list)valueList) => PvObject :
Assigns scalar array data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleIntArray') pv = channel.putGetScalarArray([0,1,2,3,4], 'putField(value)getField(value)')
-
putGetShort
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetShort((object)value, (str)requestDescriptor) => PvObject :
Assigns short data to the channel PV and returns new PV value.
- Parameter
value (int) - short value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetShort((object)value) => PvObject :
Assigns short data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - short value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleShort') pv = channel.putGetShort(-1000)
-
putGetString
((Channel)arg1, (str)value, (str)requestDescriptor) → PvObject :¶ - putGetString((str)value, (str)requestDescriptor) => PvObject :
Assigns string data to the channel process variable and returns new PV value.
- Parameter
value (str) - string value that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
channel = Channel('exampleString') pv = channel.putGetString('string value', 'putField(value)getField(value)')
- putGetString((str)value) => PvObject :
Assigns string data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (str) - string value that will be assigned to the channel PV’
- Returns
channel PV data
channel = Channel('exampleString') pv = channel.putGetString('string value')
-
putGetUByte
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetUByte((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned byte value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetUByte((object)value) => PvObject :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned byte value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUByte') pv = channel.putGetUByte(-10)
-
putGetUInt
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetUInt((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned int data to the channel PV and returns new PV value.
- Parameter
value (int) - unsigned int value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetUInt((object)value) => PvObject :
Assigns unsigned int data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned int value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUInt') pv = channel.putGetUInt(1000)
-
putGetULong
((Channel)arg1, (int)value, (str)requestDescriptor) → PvObject :¶ - putGetULong((int)value, (str)requestDescriptor) => PvObject :
Assigns unsigned long data to the channel PV and returns new PV value.
- Parameter
value (long) - unsigned long value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetULong((int)value) => PvObject :
Assigns unsigned long data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (long) - unsigned long value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleULong') pv = channel.putGetULong(1000L)
-
putGetUShort
((Channel)arg1, (object)value, (str)requestDescriptor) → PvObject :¶ - putGetUShort((object)value, (str)requestDescriptor) => PvObject :
Assigns unsigned short data to the channel PV and returns new PV value.
- Parameter
value (int) - unsigned short value that will be assigned to channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- Returns
channel PV data
- putGetUShort((object)value) => PvObject :
Assigns unsigned short data to the channel PV using the default request descriptor ‘putField(value)getField(value)’, and returns new PV value.
- Parameter
value (int) - unsigned short value that will be assigned to the channel PV
- Returns
channel PV data
channel = Channel('exampleUShort') pv = channel.putGetUShort(1000)
-
putInt
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putInt((object)value, (str)requestDescriptor) => None :
Assigns integer data to the channel PV.
- Parameter
value (int) - integer value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putInt((object)value) => None :
Assigns integer data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - integer value that will be assigned to the channel PV
channel = Channel('exampleInt') channel.putInt(1000)
-
putLong
((Channel)arg1, (int)value, (str)requestDescriptor) → None :¶ - putLong((int)value, (str)requestDescriptor) => None :
Assigns long data to the channel PV.
- Parameter
value (long) - long value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putLong((int)value) => None :
Assigns long data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (long) - long value that will be assigned to the channel PV
channel = Channel('long01') channel.putLong(100000L)
-
putScalarArray
((Channel)arg1, (list)valueList, (str)requestDescriptor) → None :¶ - putScalarArray((list)valueList, (str)requestDescriptor) => None :
Assigns scalar array data to the channel PV according to the specified request descriptor.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
- Parameter
requestDescriptor (str) - PV request descriptor
- putScalarArray((list)valueList) => None :
Assigns scalar array data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
valueList (list) - list of scalar values that will be assigned to the channel PV
channel = Channel('intArray01') channel.putScalarArray([0,1,2,3,4])
-
putShort
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putShort((object)value, (str)requestDescriptor) => None :
Assigns short data to the channel PV.
- Parameter
value (int) - short value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putShort((object)value) => None :
Assigns short data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - short value that will be assigned to the channel PV
channel = Channel('short01') channel.putShort(10)
-
putString
((Channel)arg1, (str)value, (str)requestDescriptor) → None :¶ - putString((str)value, (str)requestDescriptor) => None :
Assigns string data to the channel PV.
- Parameter
value (str) - string value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putString((str)value) => None :
Assigns string data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (str) - string value that will be assigned to the channel PV
channel = Channel('string01') channel.putString('string value')
-
putUByte
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putUByte((object)value, (str)requestDescriptor) => None :
Assigns unsigned byte data to the channel PV.
- Parameter
value (int) - unsigned byte value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putUByte((object)value) => None :
Assigns unsigned byte data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned byte value that will be assigned to the channel PV
channel = Channel('ubyte01') channel.putUByte(10)
-
putUInt
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putUInt((object)value, (str)requestDescriptor) => None :
Assigns unsigned integer data to the channel PV.
- Parameter
value (int) - unsigned integer value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putUInt((object)value) => None :
Assigns unsigned integer data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned integer value that will be assigned to the channel PV
channel = Channel('uexampleInt') channel.putUInt(1000)
-
putULong
((Channel)arg1, (int)value, (str)requestDescriptor) → None :¶ - putULong((int)value, (str)requestDescriptor) => None :
Assigns unsigned long data to the channel PV.
- Parameter
value (long) - unsigned long value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putULong((int)value) => None :
Assigns unsigned long data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (long) - unsigned long value that will be assigned to the channel PV
channel = Channel('ulong01') channel.putULong(100000L)
-
putUShort
((Channel)arg1, (object)value, (str)requestDescriptor) → None :¶ - putUShort((object)value, (str)requestDescriptor) => None :
Assigns unsigned short data to the channel PV.
- Parameter
value (int) - unsigned short value that will be assigned to channel data according to the specified request descriptor
- Parameter
requestDescriptor (str) - PV request descriptor
- putUShort((object)value) => None :
Assigns unsigned short data to the channel PV using the default request descriptor ‘field(value)’.
- Parameter
value (int) - unsigned short value that will be assigned to the channel PV
channel = Channel('ushort01') channel.putUShort(10)
-
setMonitorMaxQueueLength
((Channel)arg1, (object)maxQueueLength) → None :¶ - setMonitorMaxQueueLength((object)maxQueueLength) => None :
Sets maximum monitor queue length. Negative number means unlimited length, while the value of zero disables monitor queue. When monitor queue is disabled, incoming data is processed immediately by all python subscribers (i.e., there is no processing thread running in the background). When monitoring queue is full, channel will not be polled for new data. Default monitor queue length is zero.
- Parameter
maxQueueLength (int) - maximum queue length
channel.setMonitorMaxQueueLengthTimeout(10)
-
setTimeout
((Channel)arg1, (object)timeout) → None :¶ - setTimeout((object)timeout) => None :
Sets channel timeout.
- Parameter
timeout (float) - channel timeout in seconds
channel.setTimeout(10.0)
-
startMonitor
((Channel)arg1, (str)requestDescriptor) → None :¶ - startMonitor((str)requestDescriptor) => None :
Starts channel monitor for PV value changes.
- Parameter
requestDescriptor (str) - describes what PV data should be sent to subscribed channel clients
channel.startMonitor('field(value,alarm,timeStamp)')
- startMonitor() => None :
Starts channel monitor for PV value changes using the default request descriptor ‘field(value)’.
channel.startMonitor()
-
stopMonitor
((Channel)arg1) → None :¶ - stopMonitor() => None :
Stops channel monitor for PV value changes.
channel.stopMonitor()
-
subscribe
((Channel)arg1, (str)subscriberName, (object)subscriber) → None :¶ - subscribe((str)subscriberName, (object)subscriber) => None :
Subscribes python object to notifications of changes in PV value. Channel can have any number of subscribers that start receiving PV updates after startMonitor() is invoked. Updates stop after channel monitor is stopped via stopMonitor() call, or object is unsubscribed from notifications using unsubscribe() call.
- Parameter
subscriberName (str) - subscriber object name
- Parameter
subscriber (object) - reference to python subscriber object (e.g., python function) that will be executed when PV value changes
The following code snippet defines a simple subscriber object, subscribes it to PV value changes, and starts channel monitor:
def echo(x): print 'New PV value: ', x channel = Channel('exampleFloat') channel.subscribe('echo', echo) channel.startMonitor()
-
unsubscribe
((Channel)arg1, (str)subscriberName) → None :¶ - unsubscribe((str)subscriberName) => None :
Unsubscribes subscriber object from notifications of changes in PV value.
- Parameter
subscriberName (str) - subscriber name
channel.unsubscribe('echo')
MultiChannel¶
-
class
pvaccess.
MultiChannel
¶ Bases:
Boost.Python.instance
This class is used to communicate with multiple PV channels.
MultiChannel(names [, providerType=PVA])
- Parameter
names (list) - channel names
- Parameter
providerType (PROVIDERTYPE) - provider type, either PVA (PV Access) or CA (Channel Access)
The following example allows access to PVA channels ‘int01’ and ‘double01’:
mChannel = MultiChannel(['int01','double01'])
-
get
((MultiChannel)arg1) → PvObject :¶ - get() => PvObject :
Retrieves PV data from multiple channels’.
- Returns
PvObject with NTMultiChannel structure that contains retrieved channel data as a variant union array
pv = mChannel.get()
PvaServer¶
-
class
pvaccess.
PvaServer
¶ Bases:
Boost.Python.instance
PvaServer is a class that wrapps PVA server functionality. Channel data can be retrieved and manipulated using standard PVA command line tools and APIs.
PvaServer():
pvaServer = PvaServer() # Initializes server without any records
PvaServer(channelName, pvObject):
- Parameter
channelName (str) - channel name
- Parameter
pvObject (PvObject) - PV object that will be exposed on the specified channel. Any changes to object’s field values will be reflected on the channel.
- Raises
PvaException - in case of any errors
pv = PvObject({'x': INT, 'y' : INT}) pvaServer = PvaServer('pair', pv) # Initializes server with first record pv['x'] = 3 # The 'pair' channel will now have field 'x' value set to 3
PvaServer(channelName, pvObject, onWriteCallback):
- Parameter
channelName (str) - channel name
- Parameter
pvObject (PvObject) - PV object that will be exposed on the specified channel. Any changes to object’s field values will be reflected on the channel.
- Parameter
onWriteCallback (object) - reference to python object (e.g., python function) that will be executed on channel write.
- Raises
PvaException - in case of any errors
# Server will call echo() any time clients write new value to the pair channel pv = PvObject({'x': INT, 'y' : INT}) def echo(x): print('New PV value was written: %s' % x) pvaServer = PvaServer('pair', pv, echo)
-
addRecord
((PvaServer)arg1, (str)channelName, (PvObject)pvObject[, (object)onWriteCallback=None]) → None :¶ - addRecord((str)channelName, (PvObject)pvObject [, (object)onWriteCallback=None]) => None :
Adds PV record to the server database.
- Parameter
channelName (str) - channel name
- Parameter
pvObject (PvObject) - PV object that will be exposed on the specified channel. Any changes to object’s field values will be reflected on the channel.
- Parameter
onWriteCallback (object) - reference to python object (e.g., python function) that will be executed on channel write.
- Raises
ObjectAlreadyExists - when database already contains record associated with a given channel name
- Raises
PvaException - in case of any other errors
pv = PvObject({'x' : INT, 'y' : INT}, {'x' : 3, 'y' : 5}) def echo(x): print('New PV value was written: %s' % x) pvaServer.addRecord('pair', pv, echo)
-
getRecordNames
((PvaServer)arg1) → list :¶ - getRecordNames() => list :
Retrieves existing channel names from the server’s database.
- Returns
list of known channel names
recordNames = pvaServer.getRecordNames()
-
hasRecord
((PvaServer)arg1, (str)channelName) → bool :¶ - hasRecord((str)channelName) => bool :
Determines if server database contains PV record associated with a given channel name.
- Parameter
channelName (str) - channel name
- Returns
True if record exists, false otherwise
if pvaServer.hasRecord('pair'): print('Server contains the pair channel.)'
-
removeAllRecords
((PvaServer)arg1) → None :¶ - removeAllRecords() => None :
Removes all PV records from the server database.
- Raises
PvaException - in case of any errors
pvaServer.removeAllRecords()
-
removeRecord
((PvaServer)arg1, (str)channelName) → None :¶ - removeRecord((str)channelName) => None :
Removes PV record from the server database.
- Parameter
channelName (str) - channel name
- Raises
ObjectNotFound - when database does not contain record associated with a given channel name
- Raises
PvaException - in case of any other errors
pvaServer.removeRecord('pair')
-
start
((PvaServer)arg1) → None :¶ - start() => None :
Starts PVA server. This method is called in all constructors automatically, but may be used to restart server if it has been stopped.
- Raises
PvaException - in case of any errors
pvaServer.start()
-
stop
((PvaServer)arg1) → None :¶ - stop() => None :
Stops PVA server.
- Raises
PvaException - in case of any errors
pvaServer.stop()
-
update
((PvaServer)arg1, (PvObject)pvObject) → None :¶ - update((PvObject)pvObject) => None :
Updates server’s PV object. This method is atomic, but can be used only when there is a single record in the master database.
- Parameter
pvObject (PvObject) - PV object with a structure equivalent to the structure of the object registered on the server’s PV channel.
- Raises
InvalidRequest - when there is none or more than one record in the database
pv2 = PvObject({'x' : INT, 'y' : INT}, {'x' : 3, 'y' : 5}) pvaServer.update(pv2)
- update((str)channelName, (PvObject)pvObject) => None :
Updates server’s PV object on a given channel. This method is atomic, and should be used when there are multiple records in the master database.
- Parameter
pvObject (PvObject) - PV object with a structure equivalent to the structure of the object registered on the server’s PV channel.
- Raises
ObjectNotFound - when there is no record associated with a given channel
pv = PvObject({'x' : INT, 'y' : INT}, {'x' : 3, 'y' : 5}) pvaServer.update('myChannel', pv)
RpcServer¶
-
class
pvaccess.
RpcServer
¶ Bases:
Boost.Python.instance
RpcServer is class used for hosting PVA RPC services. One instance of RpcServer can host multiple RPC services.
RpcServer():
rpcServer = RpcServer()
-
listen
((RpcServer)arg1[, (object)seconds=0]) → None :¶ - listen([(object)seconds=0]) => None :
Start serving RPC requests.
- Parameter
seconds (int) - specifies the amount of time server should be listening for requests (0 indicates ‘forever’)
rpcServer.listen(60)
-
registerService
((RpcServer)arg1, (str)serviceName, (object)serviceImpl) → None :¶ - registerService((str)serviceName, (object)serviceImpl) => None :
Registers service implementation with RPC server. Typically, all services are registered before RPC server starts listening for client requests.
- Parameter
serviceName (str) - service name (name of the PV channel used for RPC client/server communication)
- Parameter
serviceImpl (object) - reference to service implementation object (e.g., python function) that returns PV Object upon invocation
The following is an example of RPC service that creates NT Table according to client specifications:
import pvaccess import random def createNtTable(pvRequest): nRows = x.getInt('nRows') nColumns = x.getInt('nColumns') print 'Creating table with %d rows and %d columns' % (nRows, nColumns) ntTable = pvaccess.NtTable(nColumns, pvaccess.DOUBLE) labels = [] for j in range (0, nColumns): labels.append('Column%s' % j) column = [] for i in range (0, nRows): column.append(random.uniform(0,1)) ntTable.setColumn(j, column) ntTable.setLabels(labels) ntTable.setDescriptor('Automatically created by pvaPy RPC Server') return ntTable rpcServer = pvaccess.RpcServer() rpcServer.registerService('createNtTable', createNtTable) rpcServer.listen()
-
shutdown
((RpcServer)arg1) → None :¶ - shutdown() => None :
Stop serving RPC requests. This method is equivalent to stop().
rpcServer.shutdown()
-
start
((RpcServer)arg1) → None :¶ - start() => None :
Start serving RPC requests. This method is equivalent to listen(), and blocks until either stop() or shutdown() methods are invoked.
rpcServer.start()
-
startListener
((RpcServer)arg1) → None :¶ - startListener() => None :
Starts RPC listener in its own thread. This method is typically used for multi-threaded programs, or for testing and debugging in python interactive mode. It should be used in conjunction with stopListener() call.
rpcServer.startListener()
-
stop
((RpcServer)arg1) → None :¶ - stop() => None :
Stop serving RPC requests. This method is equivalent to shutdown().
rpcServer.stop()
-
stopListener
((RpcServer)arg1) → None :¶ - stopListener() => None :
Stops RPC listener thread. This method is used in conjunction with startListener() call.
rpcServer.stopListener()
-
unregisterService
((RpcServer)arg1, (str)serviceName) → None :¶ - unregisterService((str)serviceName) => None :
Unregisters given service from RPC server.
- Parameter
serviceName (str) - service name (name of the PV channel used for RPC client/server communication)
rpcServer.unregisterService('createNtTable')
-
RpcClient¶
-
class
pvaccess.
RpcClient
¶ Bases:
Boost.Python.instance
RpcClient is a client class for PVA RPC services.
RpcClient(channelName)
- Parameter
channelName (str) - RPC service channel name
This example creates RPC client for channel ‘createNtTable’:
rpcClient = RpcClient('createNtTable')
-
getChannelName
((RpcClient)arg1) → str :¶ - getChannelName() => str :
Retrieves channel name.
- Returns
channel name
channelName = rpcClient.getChannelName()
-
getTimeout
((RpcClient)arg1) → float :¶ - getTimeout() => float :
Retrieves client timeout.
- Returns
client timeout in seconds
timeout = rpcClient.getTimeout()
-
invoke
((RpcClient)arg1, (PvObject)pvArgument, (object)timeout) → PvObject :¶ - invoke((PvObject)pvArgument, (object)timeout) => PvObject :
Invokes RPC call against service registered on the PV specified channel, and with a specified timeout.
- Parameter
pvArgument (PvObject) - PV argument object with a structure conforming to requirements of the RPC service registered on the given PV channel
- Parameter
timeout (float) - RPC client timeout in seconds
- Returns
PV response object
The following code works with the above RPC service example:
pvArgument = PvObject({'nRows' : INT, 'nColumns' : INT}) pvArgument.set({'nRows' : 10, 'nColumns' : 10}) pvResponse = rpcClient(pvArgument, 10) ntTable = NtTable(pvResponse)
- invoke((PvObject)pvArgument) => PvObject :
Invokes RPC call against service registered on the PV specified channel, with a timeout set previously (if not set, default timeout of 1 second will be used).
- Parameter
pvArgument (PvObject) - PV argument object with a structure conforming to requirements of the RPC service registered on the given PV channel
- Returns
PV response object
The following code works with the above RPC service example:
pvArgument = PvObject({'nRows' : INT, 'nColumns' : INT}) pvArgument.set({'nRows' : 10, 'nColumns' : 10}) pvResponse = rpcClient(pvArgument) ntTable = NtTable(pvResponse)
-
setTimeout
((RpcClient)arg1, (object)timeout) → None :¶ - setTimeout((object)timeout) => None :
Sets client timeout.
- Parameter
timeout (float) - client timeout in seconds
client.setTimeout(10.0)