函数连接两个随机filter

HRESULT ConnectFilters( IBaseFilter *pSrc, IBaseFilter *pDest )

{

	IPin *pIn = 0;

	IPin *pOut = 0;

	IEnumPins *pOutEnum;

	IEnumPins *pInEnum;

	PIN_DIRECTION ThisPinDir;

	HRESULT hr = pSrc->EnumPins( &pOutEnum );

	hr = pDest->EnumPins( &pInEnum );

	while (pOutEnum->Next( 1, &pOut, NULL) == S_OK )

	{

		hr = pOut->QueryDirection( &ThisPinDir );

		while( ThisPinDir==PINDIR_OUTPUT && pInEnum->Next( 1, &pIn, 0 ) == S_OK )

		{

			hr = pIn->QueryDirection( &ThisPinDir );

			if( ThisPinDir==PINDIR_INPUT )

			{

				// Try to connect them.

				hr = pigb->Connect( pOut, pIn);

				if(SUCCEEDED(hr))

				{

					hr = pOutEnum->Release();

					hr = pInEnum->Release();

					hr = pIn->Release();

					hr = pOut->Release();

					return S_OK;

				}

			}

			hr = pIn->Release();

		}//end while

		hr = pInEnum->Reset();

		hr = pOut->Release();

    }//end while

	pOutEnum->Reset();

	hr = pOutEnum->Release();

	hr = pInEnum->Release();

    return E_FAIL;

}