MCI_DGV_STOP_PARMS
The MCI_DGV_STOP_PARMS structure contains the information for MCI_STOP command message for digital-video devices. When assigning data to its fields, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the fields.
typedef struct {
DWORD dwCallback;
} MCI_DGV_STOP_PARMS;
The low-order word specifies a window handle used for the MCI_NOTIFY flag.