[PyQt] Qt or PyQt problem?

[Darren Dale]

On Wed, Jun 3, 2009 at 2:20 PM, Darren Dale <dsdale24 at gmail.com> wrote:

> On Wed, Jun 3, 2009 at 12:08 PM, Phil Thompson <
> phil at riverbankcomputing.com> wrote:
>
>> On Wed, 03 Jun 2009 17:37:29 +0200, "V. Armando Solé" <sole at esrf.fr>
>> wrote:
>> > Hello,
>> >
>> > The problem can be solved as shown below.
>> >
>> > It seems the linux 32 bit implementation gets confused in
>> > createIndex(row, column, a) when a is not an integer but a long. With
>> > small values of a (10, 100, 1000),  the indexId() method returns the
>> > supplied value.
>> >
>> > The solution is to call createIndex(row, column, a) with a being a
>> > python object and not its id. The indexId() method can be masked with a
>> > 32 bit mask if it returns a negative value. I have only found that
>> > misbehavior under linux 32bit. Windows XP and linux 64-bit behave
>> properly.
>> >
>> > Thanks for your time,
>> >
>> > Armando
>> >
>> > import PyQt4.Qt as qt
>> > import random
>> > import sys
>> >
>> > mask = 0xFFFFFFFF
>> >
>> > class Model(qt.QAbstractItemModel):
>> >   def index(self, row, column, parent):
>> >       a=[random.random()]
>> >       index =  self.createIndex(row, column, a)
>> >       print "Next two values should be the same"
>> >       returned = index.internalId()
>> >       if returned < 0:
>> >           returned = returned & mask
>> >       print "indexInternalId = ", returned
>> >       print "id(a) = ", id(a)
>> >       print "Forcing to be the same with a 32 bit mask"
>> >       print "indexInternalId = ", index.internalId() & mask
>> >       print "id(a) = ", id(a) & mask
>> >       return index
>> >
>> > if __name__ == "__main__":
>> >   app = qt.QApplication([])
>> >   w = Model()
>> >   w.index(0,0,None)
>>
>> Could you see if the problem goes away if you change
>> qabstractitemmodel.sip
>> so that...
>>
>>    QModelIndex createIndex(int arow, int acolumn, int aid) const;
>>
>> ...is replaced by...
>>
>>    QModelIndex createIndex(int arow, int acolumn, quint32 aid) const;
>>
>
> I applied this change to the 20090601 snapshot. Executive summary: when I
> check different data types, I can still find places where the two id's do
> not agree. I find disagreement with the mask applied and without:
>
> When I run the script I posted, I get output like:
>
> Next two values should be the same
> indexInternalId =  1849945336
> id(a) =  139691366280440
>
> If I apply Armando's mask, I get:
>
> Next two values should be the same
> indexInternalId =  12719168
> id(a) =  12719168
>
> If I remove the mask and instead do "a=[numpy.uint32(random.random())]", I
> get ouput like:
>
> Next two values should be the same
> indexInternalId =  12719168
> id(a) =  12719168
>
> Still without the mask, if I do "a=[numpy.int64(random.random())]":
>
> Next two values should be the same
> indexInternalId =  12719168
> id(a) =  12719168
>
> And finally, with Armando's mask and with
> "a=[numpy.int64(random.random())]":
>
> Next two values should be the same
> indexInternalId =  110072896
> id(a) =  139754050917440
>

There was a bug report, it has been marked "won't fix":
http://www.qtsoftware.com/developer/task-tracker/index_html?method=entry&id=204226
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