midiConnect

The midiConnect function connects a MIDI input device to a MIDI thru or output device, or connects a MIDI thru device to a MIDI output device. 

MMRESULT midiConnect(
  HMIDI hMidi,      
  HMIDIOUT hmo,     
  LPVOID pReserved  
);

Parameters

hMidi
Handle of a MIDI input device or a MIDI thru device. (For thru devices, this handle must have been returned by a call to the midiOutOpen function.)
hmo
Handle of the MIDI output or thru device.
pReserved
Reserved; must be NULL.

Return Values

Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following:

Value Description
MIDIERR_NOTREADY Specified input device is already connected to an output device.
MMSYSERR_INVALHANDLE Specified device handle is invalid.

Remarks

After calling this function, the MIDI input device receives event data in an MIM_DATA message whenever a message with the same event data is sent to the output device driver.

A thru driver is a special form of MIDI output driver. The system will allow only one MIDI output device to be connected to a MIDI input device, but multiple MIDI output devices can be connected to a MIDI thru device. Whenever the given MIDI input device receives event data in an MIM_DATA message, a message with the same event data is sent to the given output device driver (or through the thru driver to the output drivers).

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.
  Import Library: Use winmm.lib.

See Also

Musical Instrument Digital Interface (MIDI) Overview, MIDI Functions, midiOutOpen, MIM_DATA