INFO: The RenderFile Method Does Not Work for GraphEdit (.grf) Files (313844)

MORE INFORMATION

Starting with Microsoft DirectX version 8.1, programs cannot use the IGraphBuilder::RenderFile method to open .grf files. This change was made because of program interoperability issues.

You can open GraphEdit files by using the GraphEdit utility, or by using the IStream interface. The following sample code demonstrates how to use the IStream interface:

HRESULT LoadGraphFile(IGraphBuilder *pGraph, const WCHAR* wszName)
{
    IStorage *pStorage = 0;

    if (S_OK != StgIsStorageFile(wszName))
    {
        return E_FAIL;
    }

    HRESULT hr = StgOpenStorage(wszName, 0, 
        STGM_TRANSACTED | STGM_READ | STGM_SHARE_DENY_WRITE, 0, 0, &pStorage);

    if (FAILED(hr))
    {
        return hr;
    }

    IPersistStream *pPersistStream = 0;
    hr = pGraph->QueryInterface(IID_IPersistStream, reinterpret_cast<void**>(&pPersistStream));

    if (SUCCEEDED(hr))
    {
        IStream *pStream = 0;
        pStorage->OpenStream(L"ActiveMovieGraph", 0, 
            STGM_READ | STGM_SHARE_EXCLUSIVE, 0, &pStream);

        if(SUCCEEDED(hr))
        {
            hr = pPersistStream->Load(pStream);
            pStream->Release();
        }
        pPersistStream->Release();
    }
    pStorage->Release();
    return hr;
}
				

Note that .grf files are meant for testing and debugging. They are not meant for end-user programs.