Experimental Physics and
Industrial Control System

I am running CS-Studio 4.1.1 NSLSII on Windows 7 Professional.    I am writing a GUI to interface to the IOC, using Python for the occasional scripts.  I wish to save some Process Variables to a CSV file, but I cannot figure out the code to retrieve the values from the PVs into Python.  I only want to save the data when the button is clicked, so I don’t think writing an embedded script is suit, and instead execute the script as an action.  The example program (I/O omitted) is:

 

from org.csstudio.opibuilder.scriptUtil import PVUtil

from java.awt import EventQueue

from javax.swing import JFrame

from javax.swing import JOptionPane

from javax.swing import JFileChooser

from jarray import zeros

from java.lang import Integer

 

#Force refresh of trim PVs

#This part doesn't crash

for trim_idx in range(4):

       PVUtil.writePV("iainmtestSetTR{}.PROC".format(trim_idx+1),1,10000)

      

      

trim_dac = zeros(640,Integer);

 

#This part runs, and values are printed

#PVUtil.createPV() requires a widget

 

print("About to try to create process variables")

pvs = []

for pv_idx in range(4):

       pvs.append(PVUtil.createPV("iainmtestTR{}".format(pv_idx+1), widget))

print(pvs)

 

#Try to retrieve the values from the PVs

#Program fails below

for pv_idx in range(4):

       trim_dac = PVUtil.getLongArray(pvs[pv_idx])

       curr_row = [];

       for chan_idx in range(640):

              curr_row.append(str(trim_dac[chan_idx]))

       print(curr_row)

             

 

 

 

The output is:

 

About to try to create process variables

[org.csstudio.simplepv.pvmanager.PVManagerPV@6343ddb4, org.csstudio.simplepv.pvmanager.PVManagerPV@35a4c0a3, org.csstudio.simplepv.pvmanager.PVManagerPV@5a7d7484, org.csstudio.simplepv.pvmanager.PVManagerPV@2fccb8d3]

2016-09-21 14:51:16 ERROR: Error exists in script DAC Trim Save pared.py

Traceback (most recent call last):

  File "<script>", line 29, in <module>

       at org.csstudio.opibuilder.scriptUtil.PVUtil.checkPVValue(PVUtil.java:96)

 

       at org.csstudio.opibuilder.scriptUtil.PVUtil.getLongArray(PVUtil.java:150)

 

       at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

 

       at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

 

       at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

 

       at java.lang.reflect.Method.invoke(Unknown Source)

 

 

java.lang.RuntimeException: java.lang.RuntimeException: PV iainmtestTR1 has no value.

 

What do I need to change to retrieve the PVs.

 

Thank you,

 

Iain.