This structure contains fields for the MCI_PLAY message for digital video devices.
typedef struct _MCI_DGV_PLAY_PARMS {
HWND hwndCallback; /* Window handle. */
ULONG ulFrom; /* Starting play position. */
ULONG ulTo; /* Ending play position. */
ULONG ulSpeed; /* Frames per second play speed. */
} MCI_DGV_PLAY_PARMS;
typedef MCI _ DGV _ PLAY _ PARMS * PMCI _ DGV _ PLAY _ PARMS ;