Re: [PyKDE] PyQT Segfault on widget removal.

Vio Wed, 18 Jun 2003 03:43:14 -0700

I remember similar problems usind "delete()" or "destroy()" some time ago - sorry, I forgot the exact method name. My simple workaround was to use "deleteLater()". Especially since "Later" appears to be calcutated in milliseconds: pretty fast.

Hope this helps,
Vio

PS. Appologies if this information is redundant. I didn't follow this thread from start.

Henry Kleynhans wrote:

Hi All,

Given the recent segfault discussion, I have attached an example piece of code which segfaults. I am not sure if this is a bug, or just my own stupidity though. According to the PyQT book, the way to remove a widget from it's parent is to do the following:
        myParent.removeChild(myChild)
        del myChild
The PyQT/Sip bindings seems to break if these commands gets triggered by a signal from within a child widget of the widget that is to be removed.

I get a segfault when I do the following:
        1.  Run the program (testdel.py)
        2.  Click on the DelButton button.
        3.  Switch to another application using Alt-Tab
        4.  Switch back to my testdel app.
This happens under RH9.0. (Python-2.2.2-26, PyQt-3.5-5, qt-3.1.1-6) I use the KDE desktop environment.

Does anyone know if this is a bug or how to fix/workaround this?

TIA,

Kind regards,

Henry

------------------------------------------------------------------------
#!/usr/bin/python
#
#
import sys
from qt import *
class TestWidget(QWidget): def __init__(self, *args): apply(QWidget.__init__, (self,) + args)
       self.button     = QPushButton("DelButton", self)
       self.button.resize(self.button.sizeHint())
       QObject.connect(self.button, SIGNAL("clicked()"),
                       self.slotClicked)
pass
   def slotClicked(self):
       self.emit(PYSIGNAL("sigKillButton"), ())
       pass
class MainWindow(QMainWindow): def __init__(self, *args):

apply(QMainWindow.__init__, (self,) + args)
       self.widget     = TestWidget(self)
       self.connect(self.widget, PYSIGNAL("sigKillButton"),
                    self.removeButton)
       pass
   def removeButton(self):
       self.removeChild(self.widget)
       del self.widget
       self.addButton  = QPushButton("Added Button", self)
       self.addButton.resize(self.addButton.sizeHint())
       self.addButton.show()
       pass
pass # MainWindow
def main(args):
   app = QApplication(args)
   win = MainWindow()
   win.show()
   app.connect(app, SIGNAL("lastWindowClosed()"), app, SLOT("quit()"))
   app.exec_loop()
   pass
if __name__ == "__main__":
   main(sys.argv)
   pass


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Re: [PyKDE] PyQT Segfault on widget removal.

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