A null program - what is it doing?
g.bogle at auckland.no.spam.ac.nz
Tue Jan 5 22:16:01 CET 2010
> Gib Bogle wrote:
>> No doubt a dumb question from a noob:
>> The following program (a cut down version of some test code) uses no
>> CPU, and does not terminate:
>> import sys
>> from PyQt4.QtCore import *
>> if __name__=="__main__":
>> app = QCoreApplication(sys.argv)
>> What is the program doing? What is the correct way to terminate the
>> Thanks in advance for educating me.
> I've never used QT but other graphical toolkits I have used all start
> their own "main loop" which is a loop that cycles round receiving,
> queuing and dispatching "events". You probably need to call the
> QCoreApplication's quit method to break out of this e.g.
> app.exit() or something similar, have a look at some complete PyQt4
> examples or google for PyQt4 mainloop.
Thanks. I've realized that QCoreApplication (or QApplication) manages the event
loop, and normally when it is executed you are showing a widget of some kind,
closing which ends the application. Alt-F4 acts like Ctrl-C to terminate from
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