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midiOutOpen
The midiOutOpen function opens a MIDI output device for playback.
UINT midiOutOpen(
LPHMIDIOUT lphmo,
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| UINT uDeviceID,
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| DWORD dwCallback,
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| DWORD dwCallbackInstance,
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| DWORD dwFlags
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| );
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Parameters
lphmo
Address of an HMIDIOUT handle. This location is filled with a handle identifying the opened MIDI
output device. The handle is used to identify the device in calls to other MIDI
output functions.
uDeviceID
Identifier of the MIDI output device that is to be opened.
dwCallback
Address of a callback function, an event handle, a thread identifier, or a
handle of a window or thread called during MIDI playback to process messages
related to the progress of the playback. If no callback is desired, specify NULL for
this parameter. For more information on the callback function, see MidiOutProc.
dwCallbackInstance
User instance data passed to the callback. This parameter is not used with
window callbacks or threads.
dwFlags
Callback flag for opening the device. It can be the following values:
CALLBACK_EVENT
The dwCallback parameter is an event handle. This callback mechanism is for output only.
CALLBACK_FUNCTION
The dwCallback parameter is a callback function address.
CALLBACK_NULL
There is no callback mechanism. This value is the default setting.
CALLBACK_THREAD
The dwCallback parameter is a thread identifier.
CALLBACK_WINDOW
The dwCallback parameter is a window handle.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MIDIERR_NODEVICE
| No MIDI port was found. This error occurs only when the mapper is opened.
| MMSYSERR_ALLOCATED
| The specified resource is already allocated.
| MMSYSERR_BADDEVICEID
| The specified device identifier is out of range.
| MMSYSERR_INVALPARAM
| The specified pointer or structure is invalid.
| MMSYSERR_NOMEM
| The system is unable to allocate or lock memory.
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Remarks
To determine the number of MIDI output devices present in the system, use the midiOutGetNumDevs function. The device identifier specified by wDeviceID varies from zero to one less than the number of devices present. MIDI_MAPPER
can also be used as the device identifier.
If a window or thread is chosen to receive callback information, the following
messages are sent to the window procedure or thread to indicate the progress
of MIDI output: MM_MOM_OPEN, MM_MOM_CLOSE, and MM_MOM_DONE.
If a function is chosen to receive callback information, the following
messages are sent to the function to indicate the progress of MIDI output: MOM_OPEN,
MOM_CLOSE, and MOM_DONE.
See Also
midiOutGetNumDevs, MidiOutProc, MM_MOM_OPEN, MM_MOM_CLOSE, MM_MOM_DONE
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