midiOutUnprepareHeader function winmm
Cleans up the preparation performed by the midiOutPrepareHeader function.
To learn more, see learn.microsoft.com/windows/win32/api/mmeapi/nf-mmeapi-midioutunprepareheader.
Implementation
@pragma('vm:prefer-inline')
int midiOutUnprepareHeader(HMIDIOUT hmo, Pointer<MIDIHDR> pmh, int cbmh) =>
_midiOutUnprepareHeader(hmo, pmh, cbmh);