[PyQt] QMainWindow bug?

[Erik Janssens]

Hi,

I wrote some general documentation around these
issues, with regard to Camelot development, but
it might be of use to others as well :

http://downloads.conceptive.be/downloads/camelot/doc/sphinx/build/advanced/development.html

all remarks/corrections are welcome.

Regards,

Erik

On Thu, 2011-01-20 at 10:22 +0100, Mailing List SVR wrote:
> Ok, in a my pyqt app (I'm still using pyqt-4.7.x), I have a dialog that
> require much time to open so I keep a reference to it in a app global
> variable and I use this reference to reopen the dialog after the first
> time. This seems to work and the dialog open much quicker, however in
> some undeterminated cases I get:
> 
> RuntimeError: underlying C/C++ object has been deleted
> 
> when I get this error I recreate the dialog and update the global
> reference,
> 
> can you please explain the right way to keep a reference in python to a
> qt object?
> 
> thanks
> NIcola
> 
> 
> Il giorno mer, 19/01/2011 alle 23.47 +0100, Erik Janssens ha scritto:
> > there was a change in sip/pyqt from 4.8.1 to 4.8.2 regarding
> > the detection of objects deleted by qt but still referenced in
> > python (which is the case here).  in 4.8.1 sip/pyqt tried to
> > detect this to avoid segfaults.  this detection however brought
> > other issues with it, therefor the detection was turned off again
> > in 4.8.2
> > 
> > the solution is not to keep references in python of objects
> > owned by qt when they might get deleted.
> > 
> > On Wed, Jan 19, 2011 at 12:36 PM, Mailing List SVR
> > <lists at svrinformatica.it> wrote:
> > > I can confirm the segfault:
> > >
> > > - linux, kernel 2.6.36
> > > - python 2.7.1
> > > - pyqt 4.8.2
> > > - qt 4.7.1
> > >
> > > works fine with PySide,
> > >
> > > Nicola
> > >
> > >
> > > Il giorno mer, 19/01/2011 alle 08.36 +0100, Vicent Mas ha scritto:
> > >> 2011/1/18 Nick Gaens <mail at nickgaens.com>:
> > >> > - Win7 64bit
> > >> > - Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit
> > >> > (Intel)] on win32
> > >> > - Qt v4.7.0
> > >> > - PyQt GPL v4.8.1 for Python v2.6
> > >> > Result: no crashes, works like a charm..
> > >> >
> > >>
> > >> Hi,
> > >>
> > >> I get the crash also on Windows Vista 32bit (again Python 2.6 and PyQt 4.8.2)
> > >>
> > >> Vicent
> > >>
> > >
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