The MCI_OVLY_LOAD_PARMS structure contains parameters for the MCI_LOAD message for video overlay devices. When assigning data to the fields in this data structure, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the fields.
typedef struct {
DWORD dwCallback;
DWORD lpfilename;
RECT rc;
} MCI_OVLY_LOAD_PARMS;
The MCI_OVLY_LOAD_PARMS structure has the following fields:
dwCallback
The low-order word specifies a window handle used for the MCI_NOTIFY flag.
lpfilename
Specifies a far pointer to the buffer containing a null-terminated string.
rc
Specifies a rectangle.