[PyQt] QImage memory leak in 4.10.1

[Phil Thompson]

On Thu, 23 May 2013 16:21:26 -0400, Luke Campagnola
<lcampagn at email.unc.edu> wrote:
> Howdy,
> I am using PyQt 4.10.1 (Py2.7-qt4.8.4-x32) on windows XP. It appears
that
> on this system, QImage(sip.voidptr, int, int, format) increases the
> reference count to the image data object, but does not decrease the
> refcount after the QImage is collected. Here's an example session, where
I
> am generating a QImage from a numpy array:
> 
>>>> from PyQt4 import QtGui
>>>> import ctypes, weakref, sys
>>>> import numpy as np
>>>> data = np.zeros((100,100,4), dtype=np.ubyte)
>>>> addr = ctypes.c_char.from_buffer(data,0)
>>>> sys.getrefcount(addr)
> 2
>>>> img = QtGui.QImage(addr, 100, 100, QtGui.QImage.Format_ARGB32)
>>>> sys.getrefcount(addr)   # QImage added 1 to reference count
> 3
>>>> import weakref
>>>> ref = weakref.ref(img)
>>>> del img
>>>> ref
> <weakref at 0161F090; dead>  # QImage was collected
>>>> sys.getrefcount(addr)  # but refcount is still 3
> 3
> 
> 
> Can anyone recommend a good way to convert from ndarray to QImage
> (preferrably without incurring any memory copy) ?

Using either a sip.voidptr or a string seems to work fine for me with
current snapshots.

Phil