Experimental Physics and
Industrial Control System

I agree with Mark, I suspect the problem is the datatype you’re giving the waveform, i.e. this:

a_PV = builder.Waveform("name",length=999,datatype=np.str)

That np.str should probably be some kind of a character type, not a string type.

Most EPICS developers don’t use the python softioc builder so we don’t recognize what that’s doing very well.

- Andrew

On May 19, 2020, at 4:43 PM, Mark Rivers via Tech-talk <tech-talk at aps.anl.gov> wrote:

OK, so it looks like the problem is the server, not the client.  caget and caQtDM agree, correct?

 

What does cainfo show?

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Paul Nord via Tech-talk
Sent: Tuesday, May 19, 2020 4:35 PM
To: tech-talk <tech-talk at aps.anl.gov>
Subject: Re: Displaying string Waveform in CaQtDM

 

That's exactly the same.

$ caget -S name
name 999                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
$ 

 

On Tue, May 19, 2020 at 4:31 PM Mark Rivers <rivers at cars.uchicago.edu> wrote:

You used a lowercase –s, it should be uppercase.

 

caget –S name

 

Mark

 

 

From: Tech-talk <tech-talk-bounces at aps.anl.gov> On Behalf Of Paul Nord via Tech-talk
Sent: Tuesday, May 19, 2020 4:26 PM
To: EPICS tech-talk <tech-talk at aps.anl.gov>
Subject: Re: Displaying string Waveform in CaQtDM

 

$ caget -s name
name 999                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
$

 

It appears that there are probably 999 blank spaces.

 

Paul

 

 

On Tue, May 19, 2020 at 4:17 PM Mark Rivers <rivers at cars.uchicago.edu> wrote:

What happens if you do:

caget -S name

from the Linux or Windows shell?

Mark


________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Paul Nord via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, May 19, 2020 3:59 PM
To: EPICS tech-talk
Subject: Re: Displaying string Waveform in CaQtDM

Thanks, Mark.

But that doesn't work.  I don't see any of my text appear.

Is there an example using the python ioc that works?

Or, can you make a CaQtDM window work with the code I included?

Paul


On Tue, May 19, 2020 at 1:44 PM Mark Rivers <rivers at cars.uchicago.edu<mailto:rivers at cars.uchicago.edu>> wrote:
Hi Paul,


areaDetector has lots of caQtDM files that are autoconverted from medm.  These can display waveforms as strings.


This is an example of a text entry widget to input the file path from areaDetector/ADCore/ADApp/op/ui/autoconvert/NDFileBase.ui.


        <widget class="caTextEntry" name="caTextEntry_3">
            <property name="geometry">
                <rect>
                    <x>166</x>
                    <y>33</y>
                    <width>500</width>
                    <height>20</height>
                </rect>
            </property>
            <property name="fontScaleMode">
                <enum>caLineEdit::WidthAndHeight</enum>
            </property>
            <property name="channel">
                <string>$(P)$(R)FilePath</string>
            </property>
            <property name="foreground">
                <color alpha="255">
                    <red>0</red>
                    <green>0</green>
                    <blue>0</blue>
                </color>
            </property>
            <property name="background">
                <color alpha="255">
                    <red>115</red>
                    <green>223</green>
                    <blue>255</blue>
                </color>
            </property>
            <property name="limitsMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="limitsMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="precisionMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="minValue">
                <double>0.0</double>
            </property>
            <property name="maxValue">
                <double>1.0</double>
            </property>
            <property name="colorMode">
                <enum>caLineEdit::Static</enum>
            </property>
            <property name="formatType">
                <enum>string</enum>
            </property>
        </widget>

The readback field (non-editable) is generated as this:

        <widget class="caLineEdit" name="caLineEdit_5">
            <property name="geometry">
                <rect>
                    <x>166</x>
                    <y>10</y>
                    <width>385</width>
                    <height>18</height>
                </rect>
            </property>
            <property name="fontScaleMode">
                <enum>caLineEdit::WidthAndHeight</enum>
            </property>
            <property name="channel">
                <string>$(P)$(R)FilePath_RBV</string>
            </property>
            <property name="foreground">
                <color alpha="255">
                    <red>10</red>
                    <green>0</green>
                    <blue>184</blue>
                </color>
            </property>
            <property name="background">
                <color alpha="255">
                    <red>187</red>
                    <green>187</green>
                    <blue>187</blue>
                </color>
            </property>
            <property name="limitsMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="limitsMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="precisionMode">
                <enum>caLineEdit::Channel</enum>
            </property>
            <property name="minValue">
                <double>0.0</double>
            </property>
            <property name="maxValue">
                <double>1.0</double>
            </property>
            <property name="alignment">
                <set>Qt::AlignAbsolute|Qt::AlignLeft|Qt::AlignVCenter</set>
            </property>
            <property name="formatType">
                <enum>string</enum>
            </property>
            <property name="colorMode">
                <enum>caLineEdit::Static</enum>
            </property>
        </widget>

Mark





________________________________
From: Tech-talk <tech-talk-bounces at aps.anl.gov<mailto:tech-talk-bounces at aps.anl.gov>> on behalf of Paul Nord via Tech-talk <tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>>
Sent: Tuesday, May 19, 2020 1:21 PM
To: tech-talk at aps.anl.gov<mailto:tech-talk at aps.anl.gov>
Subject: Displaying string Waveform in CaQtDM

I'm stumped on finding a working example.

I would like to put a long text string into a waveform PV and simply display it using CaQtDM.  I believe that I've got the string working since I can access it from other parts of the program.  The caMultiLineString widget suggests that it can display a waveform character string as text.  But it's not working out.

I'm using the python softioc builder.

from softioc import builder
import numpy as np
a_PV = builder.Waveform("name",length=999,datatype=np.str)
a_PV.set("This is some text")
print(bytes(bytearray(a_PV.get())).decode('ascii'))

But it's not clear how to make that string display in CaQtDM.

Any suggestions?  Is there a complete example I could look at?

Paul

-- 

Complexity comes for free, simplicity you have to work for.