[PyQt] Qt or PyQt problem?

Darren Dale dsdale24 at gmail.com
Wed Jun 3 15:16:40 BST 2009

Hi Armando,

On Wed, Jun 3, 2009 at 9:34 AM, "V. Armando Solé" <sole at esrf.fr> wrote:

> Hello,
> I think I have fallen into a Qt bug but perhaps I am wrong.
> According to the (latest) Qt documentation, QAbstractItemModel.createIndex
> takes a uint32 as the model index internalId, while the internalId() method
> of QModelIndex returns a uint64. I guess my problems are coming from that
> inconsistency.
> The problem is illustrated below. On a windows machine and on a 64-bit
> linux machine everything is fine.
> On a 32-bit linux machine the given internalId (= id(a) ) and the returned
> internalId are not the same. In fact, one of them is negative.
> Both, the linux-32 machine and the windows XP machine are running sip
> 4.7.9, PyQt 4.4.4 and qt 4.4.3
> Am I missing some obvious solution to the problem?
> Best regards,
> Armando
> import PyQt4.Qt as qt
> class Model(qt.QAbstractItemModel):
>   def index(self, row, column, parent):
>       a=[" Hello World"]
>       index =  self.createIndex(row, column, id(a))
>       print "Next two values should be the same"
>       print "indexInternalId = ", index.internalId()
>       print "id(a) = ", id(a)
>       return index
> if __name__ == "__main__":
>   app = qt.QApplication([])
>   w = Model()
>   w.index(0,0,None)

Relatedly, I think there is a small problem with the PyQt4 documentation for
the overloaded QAbstractItemModel.createIndex method. It looks like Qt's
documentation for passing a pointer is being presented in PyQt4's method for
passing an identifier, and PyQt's pointer method documentation is empty.

When I first read PyQt's documentation for this method, there was nothing to
indicate that the id passed to createIndex should end up as the index's
internalId(), so I wrote a workaround. But now that I read Qt-4.5's
documenation for this method, it seems clear that these identifiers should
be equal.

By the way, is your windows machine 32 or 64 bit?

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