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midiStreamOut function

The midiStreamOut function plays or queues a stream (buffer) of MIDI data to a MIDI output device.

Syntax


MMRESULT midiStreamOut(
  HMIDISTRM hMidiStream,
  LPMIDIHDR lpMidiHdr,
  UINT cbMidiHdr
);

Parameters

hMidiStream

Handle to a MIDI stream. This handle must have been returned by a call to the midiStreamOpen function. This handle identifies the output device.

lpMidiHdr

Pointer to a MIDIHDR structure that identifies the MIDI buffer.

cbMidiHdr

Size, in bytes, of the MIDIHDR structure.

Return value

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

Return codeDescription
MMSYSERR_NOMEM

The system is unable to allocate or lock memory.

MIDIERR_STILLPLAYING

The output buffer pointed to by lpMidiHdr is still playing or is queued from a previous call to midiStreamOut.

MIDIERR_UNPREPARED

The header pointed to by lpMidiHdr has not been prepared.

MMSYSERR_INVALHANDLE

The specified device handle is invalid.

MMSYSERR_INVALPARAM

The pointer specified by lpMidiHdr is invalid.

 

Remarks

Before the buffer is passed to midiStreamOpen, it must be prepared by using the midiOutPrepareHeader function.

Because the midiStreamOpen function opens the output device in paused mode, you must call the midiStreamRestart function before you can use midiStreamOut to start the playback.

For the current implementation of this function, the buffer must be smaller than 64K.

The buffer pointed to by the MIDIHDR structure contains one or more MIDI events, each of which is defined by a MIDIEVENT structure.

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

See also

MIDI Functions

 

 

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