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The midiDisconnect function disconnects a MIDI input device from a MIDI thru or output device, or disconnects a MIDI thru device from a MIDI output device.
MMRESULT midiDisconnect(
  HMIDI hMidi,      
  HMIDIOUT hmo,     
  LPVOID pReserved  
);
Parameters
hMidi
Handle to a MIDI input device or a MIDI thru device.
hmo
Handle to the MIDI output device to be disconnected.
pReserved
Reserved; must be NULL.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following:.
| Value | Description | 
| MMSYSERR_INVALHANDLE | Specified device handle is invalid. | 
Remarks
MIDI input, output, and thru devices can be connected by using the midiConnect function. Thereafter, whenever the MIDI input device receives event data in an MIM_DATA message, a message with the same event data is sent to the output device driver (or through the thru driver to the output drivers).
Requirements
**  Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
**  Windows 95/98/Me:** Included in Windows 95 and later.
**  Header:** Declared in Mmsystem.h; include Windows.h.
**  Library:** Use Winmm.lib.
See Also
Musical Instrument Digital Interface (MIDI), MIDI Functions, midiConnect, MIM_DATA