[pygtk] Beginner question on running PyGTK

[Steve McClure]

I've never had any luck with all the GTK code in a thread. But using this tip from the FAQ

http://faq.pygtk.org/index.py?req=show&file=faq20.001.htp

worked fine on your example code.

On May 14, 2010, at 1:48 PM, Neil Benn wrote:

> Hello,
> 
>         I have a very simple question which is stumping me.  I want to start up PyGTK and then do some interaction with my business layer to do the work I need so that I can display the data on my PyGTK app.  I'm setting up a window and then calling gtk.main().  However when I do that everything else freezes; I'm starting up an app and running something on a separate thread in the background by gtk.main just stops running.  I've recreated the problem in a simple use case below which is:
> 
> <code>
> import pygtk
> pygtk.require('2.0')
> import gtk
> import time
> from threading import Thread
> 
> class W(Thread):
>     def __init__(self):
>         Thread.__init__(self)
>         self.window = gtk.Window()
>         
>     def run(self):
>         self.window.show()
>         gtk.main()
>         
> class A(Thread):
>     def __init__(self):
>         Thread.__init__(self)
>         self.count = 0
>         
>     def run(self):
>         while True:
>             print 'a', self.count
>             self.count += 1
>             
> class B(Thread):
>     def __init__(self):
>         Thread.__init__(self)
>         self.count = 0
>         
>     def run(self):
>         while True:
>             print 'b', self.count
>             self.count += 1
>             
> if __name__ == '__main__':
>     a = A()
>     b = B() 
>     w = W()
>     a.start()
>     b.start()
>     time.sleep(2)
>     w.start()
>     while True:
>         time.sleep(0.1)
> </code>
> 
> This starts up as you would expect, printing a and b to the screen as the threading time time slicing allows. However once the PyGTK window has opened - these threads just freeze.  I'm sure I cannot be the only person who deals with this and it seems crazy to try and run everything on the GTK thread as it would surely make the GUI unresponsive on operations which take a long time?
> 
>   Note that I cannot trigger the app's business layer to start processing on a button click as the app needs to interact with the business layer (a camera capturing frames) from the word go and the application screen must be very simple with no buttons to click at all (it is just used to report the output from the camera after some frame processing).
> 
>   Thanks, in advance for your help.
> 
> Cheers,
> 
> Neil
> 
> -- 
> -- 
> 
> Neil Benn Msc
> Director
> Ziath Ltd
> Phone :+44 (0)7508 107942
> Website - http://www.ziath.com
> 
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> _______________________________________________
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--
Steve McClure
smcclure at racemi.com

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