This structure contains fields for the MCI_SET_POSITION_ADVISE message.
typedef struct _MCI_POSITION_PARMS { HWND hwndCallback; /* Window handle. */ ULONG ulUnits; /* Position change granularity. */ USHORT usUserParm; /* User parameter. */ USHORT usReserved0; /* Reserved. */ ULONG ulReserved1; /* Reserved. */ } MCI_POSITION_PARMS; typedef MCI _ POSITION _ PARMS * PMCI _ POSITION _ PARMS ;