WORD midiOutLongMsg(hMidiOut, lpMidiOutHdr, wSize)
This function sends a long MIDI message to the specified MIDI output device. Use this function to send system exclusive messages or to send a buffer filled with short messages.
HMIDIOUT hMidiOut
Specifies a handle to the MIDI output device.
LPMIDIHDR lpMidiOutHdr
Specifies a far pointer to a MIDIHDR structure that identifies the MIDI data buffer.
WORD wSize
Specifies the size of the MIDIHDR structure.
Returns zero if the function was successful. Otherwise, it returns an error number. Possible error returns are:
MMSYSERR_INVALHANDLE
Specified device handle is invalid.
MIDIERR_UNPREPARED
lpMidiOutHdr hasn't been prepared.
MIDIERR_NOTREADY
The hardware is busy with other data.
The data buffer must be prepared with midiOutPrepareHeader before it is passed to midiOutLongMsg. The MIDIHDR data structure and the data buffer pointed to by its lpData field must be allocated with GlobalAlloc using the GMEM_MOVEABLE and GMEM_SHARE flags, and locked with GlobalLock. This function may or may not return until the data block has been sent to the output device.
midiOutShortMsg, midiOutPrepareHeader