Re: DirectShow Insanity

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From: Phil Taylor (phil_at_private-citizen.com)
Date: 01/20/05 

Date: Thu, 20 Jan 2005 10:27:54 -0800

and what exactly is shown in the debug output window?

what is the return value from MediaControl->Run?

what happens if you wait for completion befor exiting the program?

some operations require the thread that started to remain alive until the
operation completes. the sample code does this, so perhaps thats the issue.

"Roulette" <Roulette@Roulette.com> wrote in message
news:%23UoVy5p$EHA.1408@TK2MSFTNGP10.phx.gbl...
> Can someone tell me why the following small snippet of DirectShow code
> causes a number of "First-chance exception"s to occur? The code actually
> seems to work fine - the music plays for a couple of seconds before
> exiting. In the full application, the music plays fine, I receive a
> callback (after setting it up) and reset the music to loop when its
> finished, etc..
>
> In other words...as far as I can tell on my machine, the code works
> exactly like it should, but those exceptions (that you can see in the
> Debug window when running the program from MSDEV) are making me worry that
> there might be a problem on some other machine.
>
> Thanks in advance for any help....
>
> - Roulette
>
>
>
> int WINAPI WinMain(HINSTANCE hinstance,HINSTANCE hprevinstance,LPSTR
> lpcmdline,int ncmdshow)
> {
> // No clean-up is done since this code is just demonstrating a problem.
>
> CoInitialize(NULL);
> IGraphBuilder *pGraph=NULL;
> IMediaControl *pMediaControl=NULL;
> const char *filename="Test.wma";
>
> HRESULT
> returnValue=CoCreateInstance(CLSID_FilterGraph,NULL,CLSCTX_INPROC_SERVER,IID_IGraphBuilder,(void
> **)&pGraph);
>
> if (FAILED(returnValue))
> return 0;
>
> if (pGraph)
> {
> pGraph->QueryInterface(IID_IMediaControl,(void **)&pMediaControl);
>
> if (pMediaControl)
> {
> WCHAR *wfile;
> int length;
> length=strlen(filename)+1;
> wfile=new WCHAR[length];
> MultiByteToWideChar(CP_ACP,0,filename,-1,wfile,length);
>
> returnValue=pGraph->RenderFile(wfile,NULL);
>
> if (FAILED(returnValue))
> return 0;
>
> pMediaControl->Run(); // This line causes several exceptions to
> occur - you can see the debug output when running in MSDEV.
>
> Sleep(2000); // Give the music a chance to play for a couple of
> seconds before exiting the program.
> }
> }
>
> return 0;
> }
>
>

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