[CRASH] QGraphicsView::mapFromScene buggy

[Alex Merry]

On Monday 20 October 2008 10:34:54 Alexis Ménard wrote:
> QSize s = dialog->size();
> QPoint pos = q->view()->mapFromScene(q->scenePos());
>
> Here is the code from popup applet. Three things that can crash :
>
> First q->view() return null so you call mapFromScene to a null or broken
> pointer. Run gdb and test the variable (or print it with kDebug).
>
> Second, q->scenePos() return crazy value (check).
>
> Third, q is null or broken. Test.

Since the crash was in mapFromScene(), q is certainly not the problem.  I 
doubt a crazy value from q->scenePos() would cause a segfault.  So the problem 
is almost certainly the result of q->view().

Alex


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