[PyQt] Pickling Problems

[Phil Thompson]

On Thu, 31 Dec 2009 22:57:05 -0800, Karthik Tharavaad
<karthiktharavaad at gmail.com> wrote:
> I've been trying to implement pickling support on some of my own classes
> which inherits QObject, however, I always crash Python when I attempt to
> run
> the application. The simple test program below illustrates my problem:
> 
> from PyQt4.QtCore import *
> 
> class Foo( QObject ):
> 
>     def __init__(self,msg="hello",parent=None):
>         super(Foo,self).__init__(parent)
>         self.msg = msg
> 
>     def __getstate__(self):
>         return self.msg
> 
>     def __setstate__(self,state):
>         self.msg = state
> 
> 
> if __name__ == "__main__":
>     import pickle
>     foo = Foo("bar")
>     foos = pickle.dumps(foo)
>     del foo
>     bar = pickle.loads( foos )
>     print( bar.msg )
> 
> Attempting to run this program crashes Python
> I'm running windows 7 and lattest version of PyQt and Qt

There is a bug in the error handling (fixed in tonight's SIP snapshot).

You need to use pickle protocol 2.

Phil