This structure contains fields for the MCI_OPEN message.
typedef struct _MCI_OPEN_PARMS { HWND hwndCallback; /* Window handle. */ USHORT usDeviceID; /* Device ID. */ USHORT usReserved0; /* Reserved. */ PSZ pszDeviceType; /* Device type. */ PSZ pszElementName; /* Element name. */ PSZ pszAlias; /* Device alias. */ } MCI_OPEN_PARMS; typedef MCI _ OPEN _ PARMS * PMCI _ OPEN _ PARMS ;