Mobile上 DirectshowCamera
我利用DirectShowCamera

平常都能正常

但十次後，Camera始出全黑面，

在於Transform filter 跟Render filter接失

ConnectFilters( pGraphBuilder, m_pTransformFilter, m_pRender );

C/C++ code

HRESULT ConnectFilters(IGraphBuilder *pGraph,IBaseFilter *pSrc,IBaseFilter *pDest){    if(( !pGraph ) || ( !pSrc ) || ( !pDest )) return E_POINTER;     // Find an output pin on the first filter.    HRESULT hr = E_FAIL;     CComPtr<IPin> pOut = NULL;     CHK( GetUnconnectedPin( pSrc, PINDIR_OUTPUT, &pOut ));     CHK( ConnectFilters( pGraph, pOut, pDest )); Cleanup:    if( FAILED( hr ))        RETAILMSG( 1, ( L"CAMERA >>> Connect Filters Failed...\r\n" ));     if( pOut )        pOut.Release();     return hr;}//=============================================================================HRESULT ConnectFilters(IGraphBuilder *pGraph, IPin *pOut, IBaseFilter *pDest){    if( (!pGraph) || (!pOut) || (!pDest) ) return E_POINTER;     // Find an input pin on the downstream filter.    HRESULT hr = E_FAIL;     CComPtr<IPin> pIn = NULL;     CHK( GetUnconnectedPin( pDest, PINDIR_INPUT, &pIn ));     PIN_INFO pinInfo_OUT, pinInfo_IN;     memset( &pinInfo_OUT, 0, sizeof( PIN_INFO ));     memset( &pinInfo_IN, 0, sizeof( PIN_INFO ));     hr = pOut->QueryPinInfo( &pinInfo_OUT );     hr = pIn->QueryPinInfo( &pinInfo_IN );     // Try to connect them.    CHK( pGraph->Connect( pOut, pIn )); Cleanup:    if( FAILED( hr ))        RETAILMSG( 1, ( L"CAMERA >>> Connect Pins Failed...\r\n" ));     if( pIn )        pIn.Release();     return hr;}//=============================================================================HRESULT GetUnconnectedPin(IBaseFilter *pFilter,PIN_DIRECTION PinDir,IPin **ppPin){    HRESULT hr = E_FAIL;     *ppPin = 0;    CComPtr<IEnumPins> pEnum = NULL;     IPin *pPin = 0;         CHK( pFilter->EnumPins( &pEnum ));     while( pEnum->Next(1, &pPin, NULL) == S_OK )    {        PIN_DIRECTION ThisPinDir;         hr = pPin->QueryDirection( &ThisPinDir );         if( ThisPinDir == PinDir )        {            CComPtr<IPin> pTmp = NULL;             hr = pPin->ConnectedTo(&pTmp);             if( SUCCEEDED( hr ))  // Already connected, not the pin we want.            {                pTmp.Release();             }            else  // Unconnected, this is the pin we want.            {                *ppPin = pPin;                 hr = S_OK;                 break;             }        }        pPin->Release();     }Cleanup:    if( FAILED( hr ))        RETAILMSG( 1, ( L"CAMERA >>> Get Unconnected Pin Failed...\r\n" ));     if( pEnum )        pEnum.Release();     return hr; }

此function後，有正找出Transform filter的output pin及Render filter的Input pin

在接Pin失，

hr = pOut->QueryPinInfo( &pinInfo_OUT ); <====S_Ok
hr = pIn->QueryPinInfo( &pinInfo_IN ); <====S_Ok

// Try to connect them.
hr = pGraph->Connect( pOut, pIn ); <====出Error code0x80040217

有可能是什原因照成的情生呢??


[解决办法]
0x80040217
VFW_E_CANNOT_CONNECT
No combination of intermediate filters could be found to make the connection.

应该是上游Filter能接受的媒体类型发生改变造成的，查查Video Capture Filter？