[Qt-interest] Handling exceptions in Qt

[Sean Harmer]

Hi,

On Monday 19 July 2010 12:58:20 Santhosh Y wrote:
> I read some where to override an API on QApplication / QCoreApplication
> for catching exceptions in a Qt application.
> Can anybody tell me the API which I should override for handling
> exceptions in my app.

You need to override bool QCoreApplication::notify(). For example in one 
application we have where a library we are using can throw exceptions we have 
this in a class derived from QCoreApplication:

bool ExceptionApplication::notify( QObject* receiver, QEvent* e )
{
    try {
        return QApplication::notify( receiver, e );
    }
    catch ( char* err ) {
        qDebug() << "ExceptionApplication::notify exception caught:" 
                 << QString( err );
		 // Do some other processing here...
    }

    return false;
}

By catching all your possible exceptions here you prevent the exception 
mechanism form unwinding the call stack any further and causing Qt to exit its 
event loop.

HTH,

Sean