The MCI_DGV_UPDATE_PARMS structure contains parameters for the MCI_UPDATE command.
typedef struct {
    DWORD dwCallback; 
    RECT  rc; 
    HDC   hDC; 
} MCI_DGV_UPDATE_PARMS; 
 When assigning data to the members of this structure, set the corresponding flags in the fdwCommand parameter of the mciSendCommand function to validate the members.
  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in digitalv.h.
MCI Overview, MCI Structures, MCI_UPDATE, mciSendCommand, RECT