[PyQt] PyQt & Twisted

[Christian Caron]

Great! Using this reactor with the latest PyQt snapshot, I don't get  
the crash anymore!

I not sure why but with this reactor, closing the last window doesn't  
close the application. Ctrl-Q works fine and is the only way I can  
quit a GUI app.

I made sure that quitLastWindowClosed is set. The Signal  
lastWindowClosed is not emitted either. Any idea?

On the mac, running the following code and closing the window doesn't  
quit the application:

from qt4reactor import install;
from PyQt4.QtCore import *
from PyQt4.QtGui import *

app = QApplication([])

install()

if __name__ == '__main__':

    widget = QWidget()
    widget.show()

    from twisted.internet import reactor
    reactor.run()


On Oct 9, 2009, at 9:05 PM, Glenn Tarbox, PhD wrote:

> You may want to try this reactor:
>
> https://launchpad.net/qt4reactor
>
> I've just seen some other traffic on this topic... I'll dig into it  
> a bit more this weekend
>
> -glenn
>
> On Fri, Oct 9, 2009 at 3:40 PM, Christian Caron <ccaron at fattoc.com>  
> wrote:
> I used to have this crash rather infrequently but it got more  
> frequent when I moved to PyQt 4.6 / Snow Leopard.
>
> Configuration
> ---------------------
> Mac OSX 10.6.1
> Qt 4.5.3
> sip-4.9.1-snapshot-20091007
> PyQt-mac-gpl-4.6.1-snapshot-20091007
>
> Crash
> -----------
>
> My investigation so far shows that PyQtProxy::unislot deletes memory  
> that was already deleted (in attempting to self destruct).
>
> Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
> Exception Codes: KERN_INVALID_ADDRESS at 0x0000000000000028
> Crashed Thread:  0  Dispatch queue: com.apple.main-thread
>
> Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
> 0   QtCore.so                     	0x00000001030db619  
> PyQtProxy::unislot(void**) + 133
> 1   QtCore.so                     	0x00000001030db6f5  
> PyQtProxy::qt_metacall(QMetaObject::Call, int, void**) + 119
> 2   QtCore                        	0x00000001005c1183  
> QMetaObject::activate(QObject*, int, int, void**) + 675
> 3   QtCore.so                     	0x000000010302ae97  
> sipQTimer::timerEvent(QTimerEvent*) + 77
> 4   QtCore                        	0x00000001005bf19e QObject::event 
> (QEvent*) + 446
> 5   QtCore.so                     	0x000000010302ae2d  
> sipQTimer::event(QEvent*) + 77
> 6   QtGui                         	0x00000001019fd3ed  
> QApplicationPrivate::notify_helper(QObject*, QEvent*) + 189
> 7   QtGui                         	0x0000000101a0405e  
> QApplication::notify(QObject*, QEvent*) + 238
> 8   QtGui.so                      	0x000000010136e1d1  
> sipQApplication::notify(QObject*, QEvent*) + 95
> 9   QtCore                        	0x00000001005aec3c  
> QCoreApplication::notifyInternal(QObject*, QEvent*) + 124
>
> Repro
> -----------
> Using the qt4reactor found here: http://twistedmatrix.com/trac/browser/sandbox/therve/qt4reactor.py?rev=22736&format=txt
> You may need to run the program a few times for it to crash.
>
> import qt4reactor
> qt4reactor.install()
>
> # Control-C
> from twisted.internet import reactor
> import signal; signal.signal(signal.SIGINT, lambda *args:reactor.stop 
> ())
>
> # Get web page.
> from twisted.web import client
> url = 'http://www.google.com'
> client.getPage(url)
>
> reactor.run()
>
> _______________________________________________
> PyQt mailing list    PyQt at riverbankcomputing.com
> http://www.riverbankcomputing.com/mailman/listinfo/pyqt
>
>
>
> -- 
> Glenn H. Tarbox, PhD ||  206-274-6919 || glenn at tarbox.org - xmpp ||  
> ghtdak - aim,jabber,IRC,yahoo
>

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