Re: DirectShow heap memory leak
From: Thore Karlsen [MVP DX] (sid_at_6581.com)
Date: 01/07/05
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Date: Fri, 07 Jan 2005 16:18:31 -0600
On Fri, 7 Jan 2005 14:56:44 -0700, "Michael Schwab"
<michael.schwab@cobecv.com> wrote:
>Working backwards is a great idea - here goes:
>
>- Already had the pVidWin stuff commented out.
>- Commented out the Run() and the infinite wait - still have the memory
>leak.
>- Commented out the Stop() and the RenderFile() - still have the memory
>leak.
>- Commented out the QueryInterface() for pControl and pEvent, and also their
>Release calls - still have the memory leak.
>- Commented out the CoCreateInstance() and pGraph->Release() calls - no more
>memory leak! (Not surprising because the CoInitialize wasn't using any heap
>space anyway, and that's all that was left).
>- Uncommented the CoCreateInstance() call but left the pGraph->Release()
>call commented out - now the memory doubles to 2.097 Mb, which is the amount
>that the CoCreateInstance() call usually takes.
>
>So for some reason the pGraph->Release() is only freeing up exactly half the
>space that CoCreateInstance() has allocated. And calling pGraph->Release()
>doesn't help, and sometimes crashes it (especially under WinXP).
>
>So what's wrong with my CoCreateInstance() call? Is it that pGraph is a
>local (stack?) variable?
Let me see if I understand correctly. This example would produce a
memory leak:
CoInitialize();
CoCreateInstance(... &pGraph);
pGraph->Release();
CoUninitialize();
Is that what you are saying? This leaks when absolutely no other code is
executed? If that's the case, there's something seriously wrong with
your system. :)
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