[PyKDE] Memory leak with QDialog

[Aurélien Gâteau]

Hello,

(Maybe this is not new to you, sorry if it's the case.)

I have been monitoring a big PyQt application lately, trying to reduce memory 
usage. I noticed that QDialog causes memory leaks.

Using C++, one can use a dialog like this:
  void function() {
    MyDialog dlg(this);
    dlg.exec();
  }

The Python equivalent is:

  def function(self):
    dlg=MyDialog(self)
    dlg.exec_loop()

Except that this is not totally equivalent:
- In the C++ version, dlg is a local variable: so it gets deleted when we get 
out of function().
- In the Python version, dlg is owned by self: when we get out of function(), 
it is still referenced and won't get garbage collected. A workaround to that 
problem is to reparent the dialog, like this:

  def function(self):
    dlg=MyDialog(self)
    dlg.exec_loop()
    dlg.reparent(None, QPoint(0,0))

The attached Python example demonstrates this.

If there is a better solution, let me know.
-- 
Aurélien Gâteau - agateau at dental-on-line.fr
Dental-on-line
23 rue du Départ
75014 PARIS - FRANCE
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