See also DRVM_ADD_THRU, DRVM_IOCTL
Sent to a MIDI input device driver to remove a given device from the list of output devices that receive MIDI throughput data. This message is sent to a device driver when an application calls the midiDisconnect function.
MMSYSERR_NOTENABLED | The driver failed to load or initialize. |
MIDIERR_NOTREADY | The MIDI hardware is busy with other data. |
DWORD dwParam1
Specifies the handle of the MIDI output device to be removed from the throughput list.
DWORD dwParam2
Address of user-instance data. This parameter can be NULL.