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midiInUnprepareHeader
The midiInUnprepareHeader function cleans up the preparation performed by the midiInPrepareHeader function.
MMRESULT midiInUnprepareHeader(
HMIDIIN hMidiIn,
|
| LPMIDIHDR lpMidiInHdr,
|
| UINT cbMidiInHdr
|
| );
|
|
Parameters
hMidiIn
Handle of the MIDI input device.
lpMidiInHdr
Address of a MIDIHDR structure identifying the buffer to be cleaned up.
cbMidiInHdr
Size of the MIDIHDR structure.
Return Values
Returns MMSYSERR_NOERROR if successful or an error otherwise. Possible error
values include the following:
MIDIERR_STILLPLAYING
| The buffer pointed to by lpMidiInHdr is still in the queue.
| MMSYSERR_INVALPARAM
| The specified pointer or structure is invalid.
| MMSYSERR_INVALHANDLE
| The specified device handle is invalid.
|
Remarks
This function is complementary to midiInPrepareHeader. You must use this function before freeing the buffer. After passing a buffer
to the device driver by using the midiInAddBuffer function, you must wait until the driver is finished with the buffer before
using midiInUnprepareHeader. Unpreparing a buffer that has not been prepared has no effect, and the
function returns MMSYSERR_NOERROR.
See Also
midiInPrepareHeader, MIDIHDR, midiInAddBuffer
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