동영상을 저장할 때

동영상을 저장할 때 
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    HRESULT hr = S_OK;
    hr = pRenderEngine.CoCreateInstance(CLSID_RenderEngine);
    IGraphBuilder   *pGraph = NULL;
    ICaptureGraphBuilder2 *pBuilder = NULL;
    IMediaControl   *pControl = NULL;
    IMediaEvent     *pEvent = NULL;

    // Build the graph.
    hr = pRenderEngine->SetTimelineObject(pMainTL);
    hr = pRenderEngine->ConnectFrontEnd( );
    hr = CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC, 
        IID_ICaptureGraphBuilder2, (void **)&pBuilder);

    // Get a pointer to the graph front end.
    hr = pRenderEngine->GetFilterGraph(&pGraph);
    hr = pBuilder->SetFiltergraph(pGraph);

    // Create the file-writing section.
    WCHAR wstring[1024];
    ZeroMemory(wstring, sizeof(wstring));
    mbstowcs(wstring, (LPCTSTR)createFileName, createFileName.GetLength());

    IBaseFilter *pMux;
    hr = pBuilder->SetOutputFileName(&MEDIASUBTYPE_Avi, wstring, &pMux, NULL);
    long NumGroups;
    hr = pMainTL->GetGroupCount(&NumGroups);



    // Loop through the groups and get the output pins.
    for (int i = 0; i < NumGroups; i++)
    {
        IPin *pPin;
        if (pRenderEngine->GetGroupOutputPin(i, &pPin) == S_OK) 
        {
            hr = pBuilder->RenderStream(NULL, NULL, pPin, NULL, pMux);
            pPin->Release();
        }
    }

    // Run the graph.
    hr = pGraph->QueryInterface(IID_IMediaControl, (void **)&pControl);
    hr = pGraph->QueryInterface(IID_IMediaEvent, (void **)&pEvent);
    hr = pControl->Run();

    long evCode;
    hr = pEvent->WaitForCompletion(INFINITE, &evCode);
    hr = pControl->Stop();

    // Clean up.
    if (pMux)
    {
        pMux->Release();
    }

    pEvent->Release();
    pControl->Release();
    pGraph->Release();
    pBuilder->Release();