[PyKDE] Segfault in QGraphicsScene.drawItems

[Arve Knudsen]

Btw Phil, in case you're not aware, there's an equivalent bug in
QGraphicsView.

Arve

On 2/23/07, Arve Knudsen <arve.knudsen at gmail.com> wrote:
>
> Thanks Phil. I've tried to make sense of how to make sip convert between
> the two (array<->list), but give up (I've never learnt sip). I'll leave this
> to the expert ...
>
> Arve
>
> On 2/23/07, Phil Thompson <phil at riverbankcomputing.co.uk> wrote:
> >
> > On Friday 23 February 2007 7:04 pm, Arve Knudsen wrote:
> > > On 2/23/07, Michael Guntsche <mike at it-loops.com> wrote:
> > > > On Feb 23, 2007, at 17:51, Arve Knudsen wrote:
> > > > > Hello
> > > > > If I try to reimplement the method drawItems in a QGraphicsScene
> > > > > subclass, the program segfaults. Is this a bug in PyQt? I am by
> > the
> > > > > way using PyQt 4.1.1 (self-compiled) and Qt 4.2.0 (Ubuntu). I've
> > > > > included a sample program which exhibits the behaviour.
> > > >
> > > > Works here.
> > > > QT 4.2.2 and the latest Pyqt snapshot.
> > >
> > > Very strange ... I've now installed the latest snapshot, and the
> > problem
> > > persists. This time on a Gentoo installation with Qt 4.2.2. Inspecting
> > the
> > > generated Python bindings, sipQtGuiQGraphicsScene.cpp , it seems to me
> > there
> > > is a bug in meth_QGraphicsScene_drawItems. Argument 3, an array of
> > > QGraphicsItem*, is actually treated as a return value from the
> > > corresponding C++ function and thus uninitialized before being passed
> > to
> > > Qt. As such I wonder how come it doesn't crash on your machine, maybe
> > the
> > > memory error is not detected?
> > >
> > > If you print out the arguments to drawItems in Python you'll find that
> > > instead of a list of QGraphicItems you'll receive an int instead (the
> > > number of items).
> >
> > It's a bug - I need to add some handwritten code to handle the array.
> >
> > Phil
> >
> > _______________________________________________
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> >
>
>
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