函数可以连接任意两个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;}

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