How to log uncaught exceptions of a QApplication?

Question

Where should i use an except block in order to log exceptions of a QApplication?

This doesn't seem to work:

app = QtGui.QApplication(sys.argv)
MainWindow = MainWindow()
MainWindow.show()
try:
    eventLoop = app.exec_()
except Exception, e:
    log.exception(str(e))

as the exception won't even reach that block.

Answer 1

I solved it by overriding the excepthook, as seen in the following answer: Logging All Exceptions in a pyqt4 app

Answer 2

Throwing exceptions from an event handler is not supported in Qt. You must reimplement QApplication::notify() and catch all exceptions there.

Overwrite the function bool QApplication::notify(QObject * receiver, QEvent *event) so that it catches all thrown exceptions.

You can implement like this.

virtual bool notify(QObject * receiver, QEvent * event) 
{
     try 
     {
     return QApplication::notify(receiver, event);
     } 
     catch(std::exception& e) 
     {
      qDebug() << "Exception thrown:" << e.what();
     }
}