void GetConvertSourceVideoType(IltmmConvert *pConvert) { CString strVideoType; BSTR bstr = NULL; // get the source video type name pConvert->get_SourceVideoType(&bstr); // format display string strVideoType.Format(TEXT("Source video type GUID is %s"), bstr); // display the source video type MessageBox(NULL, strVideoType, TEXT("Source Video Type"), MB_OK); // free the bstr SysFreeString(bstr); }