You can't pickle QObject subclasses, because they are C++ extensions and
contain internal state and pointers and stuff.
The Qt approach (to follow what they already do on QMainWindow and other
widgets) is to create a saveState() and restoreState(state) method on your class
class Widget(QtGui.QWidget):
def saveState(self):
state = {
'size': (500,50)
}
return state
def restoreState(self, state):
size = state.get('size')
if size:
self.resize(size)
Then you would pickle the simple object state and later get it back and call
restoreState() on an instance. I find this approach also useful for loading
back preferences of your widgets from QSettings on the fly. QSettings allows
you to serialize any QVariant type though. But I try and avoid it because it
hard codes "PyQt" or "PySide" to your serialization file. I prefer to pickle it
first and save it as a string.
On Apr 26, 2013, at 1:48 AM, illunara wrote:
> Hi everybody
>
> I try to export some data using cPickle, its fine when i try on difference
> object, but not pyqt. It gave me an error
>
> # Error: TypeError: file C:\Program
> Files\Autodesk\Maya2012\bin\python26.zip\copy_reg.py line 71: the sip.wrapper
> type cannot be instantiated or sub-classed #
>
> I'm using xml to export data too, but just curious :D
>
> Also, i have another favor want to ask , can anyone give me some sample about
> writing a callback using Python please? :3
>
> Thanks
>
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