[PyQt] segfault when using a proxy and SIGNAL( "clicked(QModelIndex)" )

Darren Dale dsdale24 at gmail.com
Mon Apr 13 20:43:07 BST 2009

On Mon, Apr 13, 2009 at 3:11 PM, Andreas Pakulat <apaku at gmx.de> wrote:

> On 13.04.09 10:27:56, Darren Dale wrote:
> > On Mon, Apr 13, 2009 at 9:58 AM, Andreas Pakulat <apaku at gmx.de> wrote:
> > > On 13.04.09 14:11:46, Arnold Krille wrote:
> > > > It is a pointer for internal purposes, that is internal for the model
> > > > so it can map indexes to the internal data structures. (And yes, that
> > > > is needed for anything except simple list or table models.:)
> > >
> > > <nitpick>Thats not true actually, you can create the most complex model
> > > imaginable without using the internalPointer, simply by using the
> > > internalId and the related createIndex overload. That also
> automatically
> > > solves any problems created by python's refcounting+garbage collection
> > > (if you forget to store a reference to an object for the model in your
> > > model)
> >
> > Could you please sugggest an example of this approach, if you know of
> one?
> Thats easy, provide some way of hashing the objects in your tree, then
> use the hashnumber for the internal id. Often using id(yourobject) works
> quite well as internal id. Then all you need is a dict using the id as
> key and the real object as value, so you can easily look your object up.
> Or maybe your internal data layout already orders the objects in some
> way, then the searching through that tree might be efficiently possible
> and you don't need the dict at all. I don't have a pyqt source tree
> here, but I think the tree model example uses internalId for storing and
> identifier for each object.

Ok, I think I get it, thank you. When I get time, I'll improve the example I
posted in the other thread and share it with the list.

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