Experimental Physics and
Industrial Control System

Florian Feldbauer via Tech-talk <tech-talk at aps.anl.gov> · Wed, 5 Oct 2022 16:40:20 +0200

Hey all,

I have written a small program using the PVXS library. Trying to access

the PVs with Phoebus release 4.7.0 I encountered an issues:

I'm using a boolean button widget in Phoebus to access a NTScalar with

boolean type and get the message "Cannot decode ..."

In the shell I get the message:

2022-10-05 16:24:10 WARNING [org.phoebus.pv] Cannot decode

'PND:LMD:RUNCTRL:SHUTDOWN' [CID 2, SID 117768961 CONNECTED] =

epics:nt/NTScalar:1.0

    boolean value false
    alarm_t alarm [NO_ALARM]
        int severity 0
        int status 0
        string message
    time_t timeStamp [2022-10-05 16:23:26.000318114]
        long secondsPastEpoch 1664979806
        int nanoseconds 318114
        int userTag 0

java.lang.Exception: Expected struct with scalar 'value', got

epics:nt/NTScalar:1.0

    boolean value false
    alarm_t alarm [NO_ALARM]
        int severity 0
        int status 0
        string message
    time_t timeStamp [2022-10-05 16:23:26.000318114]
        long secondsPastEpoch 1664979806
        int nanoseconds 318114
        int userTag 0

    at

org.phoebus.pv.pva.PVAStructureHelper.decodeScalar(PVAStructureHelper.java:148)

    at

org.phoebus.pv.pva.PVAStructureHelper.getVType(PVAStructureHelper.java:99)

    at org.phoebus.pv.pva.PVA_PV.handleMonitor(PVA_PV.java:88)

    at

org.epics.pva.client.MonitorRequest.decodeValueUpdate(MonitorRequest.java:236)

    at

org.epics.pva.client.MonitorRequest.handleResponse(MonitorRequest.java:198)

    at

org.epics.pva.client.MonitorHandler.handleCommand(MonitorHandler.java:40)

    at

org.epics.pva.client.MonitorHandler.handleCommand(MonitorHandler.java:21)

    at

org.epics.pva.common.CommandHandlers.handleCommand(CommandHandlers.java:66)

    at

org.epics.pva.client.ClientTCPHandler.handleApplicationMessage(ClientTCPHandler.java:331)

    at org.epics.pva.common.TCPHandler.handleMessage(TCPHandler.java:394)
    at org.epics.pva.common.TCPHandler.receiver(TCPHandler.java:294)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)

    at

java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)

    at

java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)

    at java.base/java.lang.Thread.run(Thread.java:833)

Is the boolean type not implemented in Phoebus? In that case I would

switch to an int value.

Cheers,
Florian

--
Ruhr-Universität Bochum
AG der Experimentalphysik I
Dr. Florian Feldbauer
NB 2/131 / Fach 125
Universitätsstr. 150
D-44801 Bochum

Office: NB 2/134
Phone:  (+49)234 / 32-23563
Fax:    (+49)234 / 32-14170
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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System