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 ;