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POPython, Pyglet, win32 API, COM: how to call IStream::Release if all I have is a pointer?
 

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  1. POPython, Pyglet, win32 API, COM: how to call IStream::Release if all I have is a pointer?
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    <p>I am trying to fix a memory leak in Pyglet. It occurs only on win32, as it involves IStream object, allocated by ole32.CreateStreamOnHGlobal not being freed.</p> <p>You can find the issue #552 on Pyglet tracker <a href="http://code.google.com/p/pyglet/issues/detail?id=552" rel="nofollow">by clicking here.</a></p> <p>As you can see in the source code, the release of the stream was left out as a TODO item: </p> <ul> <li><a href="http://code.google.com/r/michaldtz-fix-552/source/browse/pyglet/image/codecs/gdiplus.py#148" rel="nofollow">line 148</a></li> <li><a href="http://code.google.com/r/michaldtz-fix-552/source/browse/pyglet/image/codecs/gdiplus.py#204" rel="nofollow">line 204</a></li> </ul> <p>Comment in line 204 even includes my question: <em>How to call IUnknown::Release on stream?</em></p> <p>The stream is allocated in <a href="http://code.google.com/r/michaldtz-fix-552/source/browse/pyglet/image/codecs/gdiplus.py#142" rel="nofollow">line 142</a>. As pyglet does not relies on external dependencies, I don't think I can use pywin32. All we know at the python side about the stream object is <a href="http://code.google.com/r/michaldtz-fix-552/source/browse/pyglet/image/codecs/gdiplus.py#53" rel="nofollow">gdiplus.py line 53</a></p> <pre><code>LPSTREAM = c_void_p </code></pre> <p>So, this is my background - the situation and the limitations. Now, my question - again. How can I call IStream::Release if all I have is a pointer? I have a long-running process that loads different images every 5 seconds or so and it looks like it is an issue for me. I can understand C/C++ and I even do some programming from time to time, but I am not win32 api expert by <em>any</em> means. Help!</p>
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