MCI_CLOSE

Releases access to a device or device element. All devices respond to this message. MMSYSTEM translates this message to the DRV_CLOSE and MCI_CLOSE_DRIVER messages sent to the device driver.

• Returns zero if successful. Otherwise, it returns an MCI error code.

DWORD lParam1

The following flags apply to all devices:

MCI_NOTIFY	Specifies that MCI should post the MM_MCINOTIFY message when this command completes. The window to receive this message is specified in the dwCallback member of the structure identified by lpDefault. Device drivers should send MM_MCINOTIFY just before returning from MCI_CLOSE_DRIVER.
MCI_WAIT	Specifies that the close operation should finish before MCI returns control to the application.

LPMCI_GENERIC_PARMS lParam2

Specifies a far pointer to the MCI_GENERIC_PARMS structure. (Devices with extended command sets might replace this structure with a device-specific structure.)

Exiting an application without closing any MCI devices it has opened can leave the device opened and unaccessible. Your application should explicitly close each device or device element when it is finished with it. MCI unloads the device when all instances of the device or all device elements are closed.

See Also

MCI_CLOSE_DRIVER, MCI_OPEN, MCI_OPEN_DRIVER