[Qt-interest] program crashes when right mouse button clicked on the gui

[hakiim the dream]

thank you. I noticed that it was because of an unhandled contextMenuEvent.And thanks for the extra debugging tips.

> Date: Wed, 2 Jun 2010 09:02:24 +0100
> Subject: Re: [Qt-interest] program crashes when right mouse button clicked on 	the gui
> From: msclrhd at googlemail.com
> To: hakiim35 at hotmail.com
> CC: qt-interest at trolltech.com
> 
> 2010/6/2 hakiim the dream <hakiim35 at hotmail.com>:
> > Hi, I am developing a desktop application which is an image
> > processing/editing app similar to the GIMP or PaintDotNet.
> > The problem is, whenever I click the right mouse button on the gui, the
> > program enters into the "qscopedpointer.h" and
> > throws an exception on the "inline T *data() const" function.
> > I can't even debug the problem since it crashes whereever you right-click on
> > the gui.
> 
> You can debug the program. What compiler/development platform are you using?
> 
> If you are using gcc, you can use gdb to help debug the application
> (or possibly some other debuggers as well). I am not familiar enough
> with gdb to help you out. Google may help here.
> 
> If you are using Visual Studio, simply:
>   1/  be sure to turn on trapping for all exceptions in the Debug >
> Exceptions menu (including the check box for break on throw);
>   2/  run the application from Visual Studio in debug mode;
>   3/  press the right mouse button on the application (or whatever
> will trigger the crash)
> 
> You will now be able to analyse the crash.
>   a/  If you look at the call stack (one of the Debug > Window items),
> you can navigate back through the call chain to see where the error is
> occurring;
>   b/  If you hover over a variable in the source window, you can see
> the value of that variable.
> 
> > The gui contains distinct widgets such as QGraphicsView, QListWidget,
> > QPushButton, etc.
> > Should I implement a right-click handler for each of the widgets? It doesn't
> > make sense to me..
> > What would you suggest?
> 
> It seems to me like you have a context menu that is invalid -- context
> menus get invoked on right-click by Qt.
> 
> Do you have a contextMenuEvent handler? If so, does it look something like this:
> 
> class MyEditor : public QTextEdit
> {
> public:
> 
>    MyEditor()
>    {
>       m_menu = new QMenu(this);
>    }
> 
>    void contextMenuEvent(QContextMenuEvent *event)
>    {
>       m_menu->exec(event->globalPos());
>    }
> 
> private:
> 
>    QMenu * m_menu;
> };
> 
> - Reece
 		 	   		  
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