[PyQt] subprocess.Popen() crash after QApplication()

[Brian Kelley]

So you are having trouble with PyQt -> Qprocess -> python as well as PyQt -> subprocess?

I guess I get around this somehow with the embedded interpereter, i.e.

 C Qapplication -> Python embedded -> PyQt -> Qprocess/subprocess

That is very interesting...

Brian

On 12/3/08 11:36 AM, "denis" <denisbz at t-online.de> wrote:

Thanks Brian,

oddly, the C QApplication -> C QProcess -> python subprocess works
(mac 10.4.11 ppc, py 2.5.1, Qt 4.4.3, PyQt 4.4.2):

QApplication app( argc, argv );
qPipe( "| python2.5 crash.py" ); -> QProcess
# crash.py is just subprocess.Popen( "date" ) as posted

So does C QApplication or C QProcess do the set_SA_RESTART stuff
in that twistedmatrix ticket, and the pyqt QApp / QProcess not ?

Also import webbrowser is ok on mac,
20592 2 May 2007
/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/webbrowser.py

cheers
-- denis


Brian Kelley wrote:
> It's actually way more complicated than that and I don't think it has
> to do with multiple threads, just with improper signal handling. Just
> running normal python I can trigger this error by:
>
> Import webbrowser
>
> A good write up of the problem as originally discovered is here:
>
> http://twistedmatrix.com/trac/ticket/733
>
> I have solved(?) this problem by copying over python 2.6's subprocess
> module (and webbrowser.py) and importing them locally. The 2.5 version
> also appears to work in my embedded python interpreter that runs Qt
> applications. It has never worked in the standard python interpreter.
>
> You may think about using QProcess in your python Qt application as
> opposed to subprocess, I'm thinking about wrapping the subprocess API
> and using a QProcess underneath the hood so I can easily swap them out.
>
> Brian Kelley
>
>

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