下面的代码为什么不能进行视频扑捉与播放,还缺什么.编程能成功.

[fengge888]

如题!

CoCreateInstance(CLSID_FilterGraph, NULL, CLSCTX_INPROC,IID_IGraphBuilder, (void **)&pGraph);

// Create the Capture Graph Builder.
CoCreateInstance(CLSID_CaptureGraphBuilder2, NULL, CLSCTX_INPROC, IID_ICaptureGraphBuilder2, (void **)&pBuilder);

// Associate the graph with the builder.
pBuilder->SetFiltergraph(pGraph);
// Create the system device enumerator.
ICreateDevEnum *pDevEnum = NULL;
CoCreateInstance(CLSID_SystemDeviceEnum, NULL, CLSCTX_INPROC, IID_ICreateDevEnum, (void **)&pDevEnum);

// Create an enumerator for video capture devices.
IEnumMoniker *pClassEnum = NULL;
pDevEnum->CreateClassEnumerator(CLSID_VideoInputDeviceCategory, &pClassEnum, 0);

ULONG cFetched;
IMoniker *pMoniker = NULL;
IBaseFilter *pSrc = NULL;
if (pClassEnum->Next(1, &pMoniker, &cFetched) == S_OK)
{
// Bind the first moniker to a filter object.
pMoniker->BindToObject(0, 0, IID_IBaseFilter, (void**)&pSrc);
pMoniker->Release();
}
pClassEnum->Release();
pDevEnum->Release();
pBuilder->RenderStream(
&PIN_CATEGORY_CAPTURE, // Pin category
&MEDIATYPE_Video, // Media type
pSrc, // Capture filter
NULL, // Compression filter (optional)
ppf // Multiplexer or renderer filter
);
pBuilder->SetOutputFileName(&MEDIASUBTYPE_Avi, L"C:\\Example.avi", &ppf, &pSink);

[fengge8ylf]

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[hxy1982]

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[fengge888]

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[fengge888]

IGraphBuilder *pGraph = NULL;
ICaptureGraphBuilder2 *pBuilder = NULL;
IBaseFilter *ppf = NULL;
IFileSinkFilter *pSink = NULL;
以上是变量的定义

[fengge888]

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[FlyOverSea]

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