MCI_UNDO Return Value - rc

rc (ULONG)

Return codes indicating success or type of failure:

MCIERR_SUCCESS

The UNDO was successful.
MCIERR_INVALID_DEVICE_ID
The device ID is not valid.
MCIERR_INVALID_FLAG
Flag (ulParam1) is invalid.
MCIERR_INSTANCE_INACTIVE
The device is currently inactive. Issue MCI_ACQUIREDEVICE to make the device context active.
MCIERR_INVALID_CALLBACK_HANDLE
Given callback handle is invalid.
MCIERR_CANNOT_UNDO
Undo is not possible in the current state.

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