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MIDM_UNPREPARE
 
        This message is sent to a MIDI input device to clean up the
        preparation performed by the MIDM_PREPARE message.
 
Parameters
        DWORD dwParam1
            Specifies a far pointer to MIDIHDR structure identifying the
            data buffer.
 
        DWORD dwParam2
            Specifies the size of the MIDIHDR structure.
 
Return value
        The return value is an error code, or zero (MMSYSERR_NOERROR) if
        the operation is successful. Possible error codes are:
 
        MMSYSERR_NOTENABLED
            The driver failed to load or initialize.
 
        MIDIERR_STILLPLAYING
            The specified data buffer is still in the input queue.
 
Comments
        Driver support for this message is optional. If a driver
        supports the MIDM_PREPARE message, then it must also support
        MIDM_UNPREPARE.
 
        The default response for this message is to return
        MMSYSERR_NOTSUPPORTED. In this case, MMSYSTEM will clean
        up the preparation previously done on the memory buffer. If a
        driver performs the preparation itself, it must clean up the
        preparation and reset the MHDR_PREPARED flag in the dwFlags
        field of the MIDIHDR structure. If a data buffer has not been
        prepared, MMSYSERR_NOERROR should be returned.
 
See also
        MIDM_PREPARE
 
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