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midiOutPrepareHeader
The midiOutPrepareHeader function prepares a MIDI system-exclusive or stream buffer for output.
MMRESULT midiOutPrepareHeader(
HMIDIOUT hmo,
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| LPMIDIHDR lpMidiOutHdr,
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| UINT cbMidiOutHdr
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| );
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Parameters
hmo
Handle of the MIDI output device. This parameter can also be the handle of a
MIDI stream cast to HMIDIOUT.
lpMidiOutHdr
Address of a MIDIHDR structure that identifies the buffer to be prepared.
cbMidiOutHdr
Size, in bytes, of the MIDIHDR structure.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MMSYSERR_INVALHANDLE
| The specified device handle is invalid.
| MMSYSERR_INVALPARAM
| The specified address is invalid or the given stream buffer is greater than
64K.
| MMSYSERR_NOMEM
| The system is unable to allocate or lock memory.
|
Remarks
A stream buffer cannot be larger than 64K.
Preparing a header that has already been prepared has no effect, and the
function returns MMSYSERR_NOERROR.
Before using this function, you must set the lpData, dwBufferLength, and dwFlags members of the MIDIHDR structure. The dwFlags member must be set to zero.
See Also
MIDIHDR
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