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<== Date ==> <== Thread ==>
Subject: Crash when caput array of string to pcaspy or PCAS server tool
From: "Wang, Lin via Tech-talk" <tech-talk at aps.anl.gov>
To: tech-talk at aps.anl.gov
Date: Thu, 14 Dec 2023 11:03:30 +0800 (GMT+08:00)

Dear all,


When I was developing a server tool with Portable Channel Access Server library, caput to scalar string or array of number data types can execute successfully. However, caput to array of string like "caput -a MTEST:NAME 3 xxx yyy zzz" will cause the server tool crash even if an empty write() method as follows is provided. Sometimes the crash occurs when caput multiple times rather than the first time.


caStatus SimplePV::write(const casCtx &ctx, const gdd &value) {
    return S_casApp_success;
}


My platform is Windows 10, Visual Studio 2022 and the PCAS in EPICS-3.14.12.8


I also tried pcaspy with the following Python code and it had the same behaviour as shown in the following picture.


#!/usr/bin/env python

from pcaspy import Driver, SimpleServer

prefix = 'MTEST:'
pvdb = {
    'NAME': {
        'type' : 'string',
        'count': 3,
        'value': ['aaa', 'bbb', 'ccc']
    },
}

class myDriver(Driver):
    def  __init__(self):
        super(myDriver, self).__init__()

if __name__ == '__main__':
    server = SimpleServer()
    server.createPV(prefix, pvdb)
    driver = myDriver()

    # process CA transactions
    while True:
        server.process(0.1)





Am I doing something wrong or understanding something incorrectly?



Thanks,

Lin


Replies:
Re: Crash when caput array of string to pcaspy or PCAS server tool Ralph Lange via Tech-talk
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