IltmmPlay::SetPreferredFilter Example for C++
// This function does the following: // 1) Sets all filters to LEAD Default filters // 2) Then resets all preferred filters to NULL, or does not use any preferred filter. // 3) Then sets LEAD H264 Decoder (3.0) as LEAD H264 Preferred Decompressor using its Friendly Name // 4) Gets the preferred H.264 Decompressor display name void TestSetPreferredFilter(IltmmPlay *pPlay) { HRESULT hr = S_OK; BSTR bstr = NULL; // Setting all filters to LEAD Default filters bstr = SysAllocString(ltmmFilter_LEADDefault); hr = pPlay->SetPreferredFilter(ltmmPlay_PreferredFilter_Generic, bstr); SysFreeString(bstr); // Resets all the preferred filters to NULL, or don't use any preferred filter. bstr = SysAllocString(ltmmFilter_DontCare); hr = pPlay->SetPreferredFilter(ltmmPlay_PreferredFilter_Generic, bstr); SysFreeString(bstr); // Setting H.264 Decompressor to LEAD H264 Decoder (3.0), using the Friendly Name bstr = SysAllocString(L"LEAD H264 Decoder (3.0)"); hr = pPlay->SetPreferredFilter(ltmmPlay_PreferredFilter_H264Decompressor, bstr); SysFreeString(bstr); // Gets the preferred H.264 Decompressor bstr = NULL; hr = pPlay->GetPreferredFilter(ltmmPlay_PreferredFilter_H264Decompressor, &bstr); // check that the preferred filter is the LEAD H264 decoder if(bstr != NULL && !_wcsicmp(bstr, ltmmFilter_LEAD_H264Decompressor)) MessageBox(NULL, TEXT("The preferred filter was set properly!"), TEXT("SUCCESS"), MB_OK); else MessageBox(NULL, TEXT("The preferred filter was not set properly!"), TEXT("FAILURE"), MB_OK); SysFreeString(bstr); }