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QCoreApplication will not quit

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  QCoreApplication will not quit Adrian Casey <mail@agcasey.com> - 2011-04-02 14:12 +0930
    Re: QCoreApplication will not quit Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2011-04-02 11:28 -0700
      Re: QCoreApplication will not quit Adrian Casey <mail@agcasey.com> - 2011-04-03 15:13 +0930

#2433 — QCoreApplication will not quit

Can someone please explain why this simple PyQt4 application never exits?

#!/usr/bin/env python
from PyQt4 import QtCore
import sys
class foo(QtCore.QObject):
	def __init__(self, parent):
		QtCore.QObject.__init__(self, parent)
		self.parent = parent
		self.end_job()

	def end_job(self):
		QtCore.QCoreApplication.quit()

if __name__ == '__main__':
	app = QtCore.QCoreApplication(sys.argv)
	myFoo = foo(parent=None)
	sys.exit(app.exec_())

This is just a very simple, cut-down example to demonstrate a problem I have 
with an application I am writing.  If I call 
QCoreApplication.hasPendingEvents(), the result is always True.  Even if I 
call QCoreApplication.processEvents(), the application still does not quit.  
It just hangs forever.

I'd appreciate some help in finding out how to make it quit.

Thanks.
Adrian.

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#2463

On Sat, 02 Apr 2011 14:12:38 +0930, Adrian Casey <mail@agcasey.com>
declaimed the following in gmane.comp.python.general:

> Can someone please explain why this simple PyQt4 application never exits?
> 
> #!/usr/bin/env python
> from PyQt4 import QtCore
> import sys
> class foo(QtCore.QObject):
> 	def __init__(self, parent):
> 		QtCore.QObject.__init__(self, parent)
> 		self.parent = parent
> 		self.end_job()
> 
> 	def end_job(self):
> 		QtCore.QCoreApplication.quit()
> 
> if __name__ == '__main__':
> 	app = QtCore.QCoreApplication(sys.argv)
> 	myFoo = foo(parent=None)
> 	sys.exit(app.exec_())
> 
	Uhm... Could it be because you've shut down the application before
ever starting it?

	Note that your __init__() method -- invoked when you create "myFoo",
ENDS with a call to end_job() which invokes the framework quit() method.

	THEN after all this framework shut down, you invoke the app.exec_()
on a framework that has nothing left to run?
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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#2502

Dennis Lee Bieber wrote:

> On Sat, 02 Apr 2011 14:12:38 +0930, Adrian Casey <mail@agcasey.com>
> declaimed the following in gmane.comp.python.general:
> 
>> Can someone please explain why this simple PyQt4 application never exits?
>> 
>> #!/usr/bin/env python
>> from PyQt4 import QtCore
>> import sys
>> class foo(QtCore.QObject):
>> def __init__(self, parent):
>> QtCore.QObject.__init__(self, parent)
>> self.parent = parent
>> self.end_job()
>> 
>> def end_job(self):
>> QtCore.QCoreApplication.quit()
>> 
>> if __name__ == '__main__':
>> app = QtCore.QCoreApplication(sys.argv)
>> myFoo = foo(parent=None)
>> sys.exit(app.exec_())
>> 
> Uhm... Could it be because you've shut down the application before
> ever starting it?
> 
> Note that your __init__() method -- invoked when you create "myFoo",
> ENDS with a call to end_job() which invokes the framework quit() method.
> 
> THEN after all this framework shut down, you invoke the app.exec_()
> on a framework that has nothing left to run?
Thanks Dennis. I should have seen that!

Cheers.
Adrian.

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