usNotifycode (USHORT)

Specifies the following notification message code:

MCI_NOTIFY_SUCCESSFUL

The command was completed successfully.
MCI_NOTIFY_SUPERSEDED
Another notification request (same type of command) was received.
MCI_NOTIFY_ABORTED
The command was interrupted and is unable to be completed. For example, the first command was a PLAY with notify, and the second command was STOP with or without notify.

Any other value indicates an error, and that value is the error number. mciGetErrorString can be used to convert the number into a textual description of the error.

usUserParameter (USHORT)

Specifies a usUserParameter notification message code.

Contains the user parameter specified on mciSendCommand or mciSendString for this command.

usDeviceID (USHORT)

The media control interface device ID included in the notification.

usMessage (USHORT)

Specifies the message ID which generated the notification.

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