MCI_UPDATE command

The MCI_UPDATE command updates the display rectangle. Digital-video devices recognize this command.

To send this command, call the mciSendCommand function with the following parameters.

MCIERROR mciSendCommand(
  MCIDEVICEID wDeviceID, 
  MCI_UPDATE, 
  DWORD dwFlags, 
  (DWORD) (LPMCI_GENERIC_PARMS) lpDest
);

Parameters

wDeviceID: Device identifier of the MCI device that is to receive the command message.
dwFlags: MCI_NOTIFY, MCI_WAIT, or, for digital-video devices, MCI_TEST. For information about these flags, see The Wait, Notify, and Test Flags.
lpDest: Pointer to an MCI_GENERIC_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)

Returns zero if successful or an error otherwise.

The following additional flags are used with the "digitalvideo" device type:

MCI_DGV_UPDATE_HDC: The hDC member of the structure identified by lpDest contains a valid window of the DC to paint. This flag is required.
MCI_DGV_RECT: The rc member of the structure identified by lpUnfreeze contains a valid display rectangle. The rectangle specifies the clipping rectangle relative to the client rectangle.
MCI_DGV_UPDATE_PAINT: An application uses this flag when it receives a WM_PAINT message that is intended for a display DC. A frame-buffer device usually paints the key color. If the display device does not have a frame buffer, it might ignore the MCI_UPDATE command when the MCI_DGV_UPDATE_PAINT flag is used because the display will be repainted during the playback operation.

For digital-video devices, the lpDest parameter points to an MCI_DGV_UPDATE_PARMS structure.

Requirement	Value
Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Mmsystem.h (include Windows.h)