midiOutLongMsg

The midiOutLongMsg function sends a system-exclusive MIDI message to the specified MIDI output device.

MMRESULT midiOutLongMsg(

HMIDIOUT hmo,
LPMIDIHDR lpMidiOutHdr,
UINT cbMidiOutHdr
);

Parameters

hmo

Handle of the MIDI output device. This parameter can also be the handle of a MIDI stream cast to HMIDIOUT.

lpMidiOutHdr

Address of a MIDIHDR structure that identifies the MIDI buffer.

cbMidiOutHdr

Size, in bytes, of the MIDIHDR structure.

Return Values

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

MIDIERR_NOTREADY	The hardware is busy with other data.
MIDIERR_UNPREPARED	The buffer pointed to by lpMidiOutHdr has not been prepared.
MMSYSERR_INVALHANDLE	The specified device handle is invalid.
MMSYSERR_INVALPARAM	The specified pointer or structure is invalid.

Remarks

Before the buffer is passed to midiOutLongMsg, it must be prepared by using the midiOutPrepareHeader function. The MIDI output device driver determines whether the data is sent synchronously or asynchronously.

See Also

MIDIHDR, midiOutPrepareHeader

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