LPTSTR OLE2T(LPCOLESTR lpw) { static TCHAR lpt[512]; if(!lpw) return NULL; lpt[0] = _T('\0'); WideCharToMultiByte(CP_ACP, 0, lpw, -1, lpt, 512, NULL, NULL); return lpt; } void IltmmPlay_get_SourceVideoType_Example (IltmmPlay* pPlay) { BSTR bstrSourceVideoType; char szSourceVideoType[256]; IltmmPlay_get_SourceVideoType(pPlay, &bstrSourceVideoType); strcpy(szSourceVideoType, "Source Video Type GUID is "); strcat(szSourceVideoType, OLE2T(bstrSourceVideoType)); MessageBox(NULL, szSourceVideoType, NULL, MB_OK); SysFreeString(bstrSourceVideoType); }