midiOutShortMsg
The midiOutShortMsg function sends a short MIDI message to the specified MIDI output device.
MMRESULT midiOutShortMsg(
HMIDIOUT hmo,
DWORD dwMsg
);
Parameters
hmo
Handle to the MIDI output device. This parameter can also be the handle of a MIDI stream cast to HMIDIOUT.
dwMsg
MIDI message. The message is packed into a DWORD value with the first byte of the message in the low-order byte. The message is packed into this parameter as follows.
| Word | Byte | Usage |
| High | High-order | Not used. |
| Low-order | The second byte of MIDI data (when needed). | |
| Low | High-order | The first byte of MIDI data (when needed). |
| Low-order | The MIDI status. |
The two MIDI data bytes are optional, depending on the MIDI status byte. When a series of messages have the same status byte, the status byte can be omitted from messages after the first one in the series, creating a running status. Pack a message for running status as follows:
| Word | Byte | Usage |
| High | High-order | Not used. |
| Low-order | Not used. | |
| Low | High-order | The second byte of MIDI data (when needed). |
| Low-order | The first byte of MIDI data. |
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error values include the following:
| Value | Description |
| MIDIERR_BADOPENMODE | The application sent a message without a status byte to a stream handle. |
| MIDIERR_NOTREADY | The hardware is busy with other data. |
| MMSYSERR_INVALHANDLE | The specified device handle is invalid. |
Remarks
This function is used to send any MIDI message except for system-exclusive or stream messages.
This function might not return until the message has been sent to the output device. You can send short messages while streams are playing on the same device (although you cannot use a running status in this case).
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