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 IltmmConvert_get_SourceVideoType_Example (IltmmConvert* pConvert) { char szVideoType[256]; BSTR bstr; IltmmConvert_get_SourceVideoType(pConvert, &bstr); strcpy(szVideoType, "Source video type GUID is "); strcat(szVideoType, OLE2T(bstr)); MessageBox(NULL, szVideoType, NULL, MB_OK); SysFreeString(bstr); }