Qt Application Crash when calling app.quit() in PyTango 9.2.0 (it works with PyTango 8.1.6)

# 6 years ago
christophe	Hi Tangoers, We try to migrate from PyTango 8.1.6 to 9.2 for our Windows clients. As we did'nt manage yet to compile PyTango 9.2.3, I use a msi installer for PyTango9.2.0. We use Python 2.7 32b. With PyTango9.2.0 within a Qt Application, if I subscribe to an attribute using pyds.subscribe_event then Python crashed when I call : app = QtGui.QApplication(sys.argv) app.quit() The same code works with PyTango 8.1.3. An example is attached. If somebody could tell me if it works on Windows with PyTango 9.2.3, it would motive us to compile ! launch: - DeclareDS - TestDevice - Client - Push OK If you have a workaround … Cheers, Christophe sample code for the client : class EventManager(): def __init__(self,deviceAdr, attrAdr,fct,app): #Subscribe to the counter self.pyds = PyTango.DeviceProxy(deviceAdr) self.id_event = self.pyds.subscribe_event(attrAdr, PyTango.EventType.CHANGE_EVENT, self.ReceiveTangoEvent, stateless = True) self.app = app self.wd = QtGui.QLabel("TEST") self.wd.show() #The QUIT button close the application self.wdButton = QtGui.QPushButton("QUIT") self.wdButton.clicked.connect(self.stop) self.wdButton.show() #Create a Signal to display the Tango Value QtCore.QObject.connect(Qt.qApp, QtCore.SIGNAL("updateData(PyQt_PyObject)"),self.UpdateGui) def ReceiveTangoEvent(self,event): print str(event.attr_value.value) Qt.qApp.emit(QtCore.SIGNAL("updateData(PyQt_PyObject)"),str(event.attr_value.value)) def UpdateGui(self,data): self.wd.setText(data) #Called by the QUIT button (OK in PyTango 8.1.6, CRASH in PyTango 9.2.0) def stop(self): QtCore.QObject.disconnect(Qt.qApp, QtCore.SIGNAL("updateData(PyQt_PyObject)"),self.UpdateGui) self.pyds.unsubscribe_event(self.id_event) self.app.quit() if __name__ == "__main__": # pragma: no cover app = QtGui.QApplication(sys.argv) #The server push a counter ev1 = EventManager("test/TestDevice/TestDevice","trignumber",test1,app) sys.exit(app.exec_()) Edited 6 years ago Attachments: 1Kb

# 6 years ago

Hi Tangoers,
We try to migrate from PyTango 8.1.6 to 9.2 for our Windows clients.
As we did'nt manage yet to compile PyTango 9.2.3, I use a msi installer for PyTango9.2.0.
We use Python 2.7 32b.

With PyTango9.2.0 within a Qt Application,
if I subscribe to an attribute using pyds.subscribe_event
then Python crashed when I call :
app = QtGui.QApplication(sys.argv)
app.quit()

The same code works with PyTango 8.1.3.
An example is attached.

If somebody could tell me if it works on Windows with PyTango 9.2.3, it would motive us to compile !
launch:
- DeclareDS
- TestDevice
- Client
- Push OK

If you have a workaround …
Cheers,
Christophe

sample code for the client :

class EventManager():
    
    def __init__(self,deviceAdr, attrAdr,fct,app):
        #Subscribe to the counter
        self.pyds = PyTango.DeviceProxy(deviceAdr)
        self.id_event = self.pyds.subscribe_event(attrAdr, PyTango.EventType.CHANGE_EVENT, self.ReceiveTangoEvent, stateless = True)
        self.app = app
        
        self.wd = QtGui.QLabel("TEST")
        self.wd.show()
        
        #The QUIT button close the application
        self.wdButton = QtGui.QPushButton("QUIT")
        self.wdButton.clicked.connect(self.stop)
        self.wdButton.show()

        #Create a Signal to display the Tango Value
        QtCore.QObject.connect(Qt.qApp, QtCore.SIGNAL("updateData(PyQt_PyObject)"),self.UpdateGui)
        
    def ReceiveTangoEvent(self,event):
        print str(event.attr_value.value)
        Qt.qApp.emit(QtCore.SIGNAL("updateData(PyQt_PyObject)"),str(event.attr_value.value))        

    def UpdateGui(self,data):
        self.wd.setText(data)

    #Called by the QUIT button (OK in PyTango 8.1.6, CRASH in PyTango 9.2.0)
    def stop(self):        
        QtCore.QObject.disconnect(Qt.qApp, QtCore.SIGNAL("updateData(PyQt_PyObject)"),self.UpdateGui)
        self.pyds.unsubscribe_event(self.id_event) 
        self.app.quit()

        
if __name__ == "__main__": # pragma: no cover

    app = QtGui.QApplication(sys.argv)

    #The server push a counter
    ev1 = EventManager("test/TestDevice/TestDevice","trignumber",test1,app)
    
    sys.exit(app.exec_())

Edited 6 years ago

# 6 years ago
christophe	a simpler example attached. code for the client is below : @author: cchappet ''' import sys,os import time from PyQt4 import QtCore from PyQt4 import Qt,QtGui import PyTango class EventManager(): def __init__(self,deviceAdr, attrAdr,app): #Subscribe to the counter self.pyds = PyTango.DeviceProxy(deviceAdr) self.id_event = self.pyds.subscribe_event(attrAdr, PyTango.EventType.CHANGE_EVENT, self.ReceiveTangoEvent, stateless = True) self.app = app #The QUIT button close the application self.wdButton = QtGui.QPushButton("QUIT") self.wdButton.clicked.connect(self.stop) self.wdButton.show() def ReceiveTangoEvent(self,event): print str(event.attr_value.value) #Called by the QUIT button (OK in PyTango 8.1.6, CRASH in PyTango 9.2.0) def stop(self): self.pyds.unsubscribe_event(self.id_event) self.app.quit() if __name__ == "__main__": # pragma: no cover app = QtGui.QApplication(sys.argv) #The server push a counter ev1 = EventManager("test/TestDevice/TestDevice","trignumber",app) sys.exit(app.exec_()) Edited 6 years ago

# 6 years ago

christophe

a simpler example attached.
code for the client is below :

@author: cchappet
'''
import sys,os
import time

from PyQt4 import QtCore
from PyQt4 import Qt,QtGui

import PyTango

class EventManager():
    
    def __init__(self,deviceAdr, attrAdr,app):
        #Subscribe to the counter
        self.pyds = PyTango.DeviceProxy(deviceAdr)
        self.id_event = self.pyds.subscribe_event(attrAdr, PyTango.EventType.CHANGE_EVENT, self.ReceiveTangoEvent, stateless = True)
        self.app = app
        
        #The QUIT button close the application
        self.wdButton = QtGui.QPushButton("QUIT")
        self.wdButton.clicked.connect(self.stop)
        self.wdButton.show()
        
    def ReceiveTangoEvent(self,event):
        print str(event.attr_value.value)

    #Called by the QUIT button (OK in PyTango 8.1.6, CRASH in PyTango 9.2.0)
    def stop(self):        
        self.pyds.unsubscribe_event(self.id_event) 
        self.app.quit()

        
if __name__ == "__main__": # pragma: no cover

    app = QtGui.QApplication(sys.argv)

    #The server push a counter
    ev1 = EventManager("test/TestDevice/TestDevice","trignumber",app)
    
    sys.exit(app.exec_())

Edited 6 years ago

# 6 years ago
Andy	Hi Christophe, you could check to see if the issue is solved in PyTango 9.2.3 using the pre-compiled binaries for Windows which are part of the continuous integration system on AppVeyor. Take a look at the slides 9 to 19 in this presentation: https://indico.eli-beams.eu/event/310/session/15/contribution/52/material/slides/1.pdf Maybe 9.2.3 solves your problem … Cheers Andy

# 6 years ago
Andy	Oops I was too quick. My suggestion to try out the AppVeyor Windows builds will only upgrade the Tango libraries and not PyTango. Maybe Sebastien can help you get access to PyTango AppVeyor builds. Sorry about raising false hopes … Andy

# 6 years ago
Geoff	Hi Christophe, Although I don't have a Windows version of PyTango 9.2.3, I've tested your code (the 2nd client version) on the linux version of PyTango 9.2.2 and it works as expected. Perhaps you could download the Windows version 9.2.2 and try it. Regards, Geoff.

# 6 years ago
TCoutinho	Hi christophe, I cannot reproduce your problem with 9.2.2 on linux neither. Could you send the error message? I recommend you try with 9.2.2. I don't see anything in the PyTango changelog that indicates your problem might be solved but since PyTango is statically linked with the tango C++ library on Windows, if you update PyTango, automatically you use the new Tango C++. So even if the problem is coming from the C++ layer, updating should make the problem disappear. Hope it helps Tiago Edited 6 years ago

# 6 years ago

TCoutinho

Hi christophe,

I cannot reproduce your problem with 9.2.2 on linux neither.

Could you send the error message?

I recommend you try with 9.2.2.

I don't see anything in the PyTango changelog that indicates your problem might be solved but since PyTango is statically linked with the tango C++ library on Windows, if you update PyTango, automatically you use the new Tango C++. So even if the problem is coming from the C++ layer, updating should make the problem disappear.

Hope it helps
Tiago

Edited 6 years ago

# 6 years ago
christophe	Hi Tiago and Geoff, There is no error message, just a "python.exe stopped working". Do you know if there is an installer (msi, exe) for PyTango 9.2.2 on Windows because we didn't manage to recompile. Christophe Edited 6 years ago

# 6 years ago
SGara_Nexeya	Hi Cristophe, can you try this installer ? https://ci.appveyor.com/api/buildjobs/djvtxrv064gr0ipj/artifacts/pytango-9.2.3.Win32-py2.7.msi or the exe file https://ci.appveyor.com/api/buildjobs/djvtxrv064gr0ipj/artifacts/pytango-9.2.3.Win32-py2.7.exe thanks

# 6 years ago
christophe	Thanks Sébastien, the msi is working fine. I still get a crash but with an error message : Assertion failed: Successful WSASTARTUP not yet performed (..\..\..\src\signaler.cpp:377) Attachments:

# 6 years ago
guifre.cuni	Hi, could it be related to ZMQ socket/context management? https://stackoverflow.com/questions/19795245/zeromq-context-singleton-provided-in-a-dll-crashes-when-program-exits-vs2010