midiOutShortMsg function

项目
06/06/2016

The midiOutShortMsg function sends a short MIDI message to the specified MIDI output device.

Syntax

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.

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.

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 value

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

Return code	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

Minimum supported client	Windows 2000 Professional [desktop apps only]
Minimum supported server	Windows 2000 Server [desktop apps only]
Header	Mmsystem.h (include Windows.h)
Library	Winmm.lib
DLL	Winmm.dll

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