Declare Function midiOutUnprepareHeader Lib "winmm.dll" (hMidiOut AS Intptr, lpMidiOutHdr AS IntPtr, cbMidiOutHdr) AS UInt32 ' LD83
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This function is complementary to the midiOutPrepareHeader function. You must call midiOutUnprepareHeader before freeing the buffer. After passing a buffer to the device driver with the midiOutLongMsg function, you must wait until the device driver is finished with the buffer before calling midiOutUnprepareHeader.
The midiOutPrepareHeader function prepares a MIDI system-exclusive or stream buffer for output. - LD83
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The midiOutUnprepareHeader function cleans up the preparation performed by the [midiOutPrepareHeader] function. - LD83
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The midiOutLongMsg function sends a system-exclusive MIDI message to the specified MIDI output device.
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The midiOutUnprepareHeader function cleans up the preparation performed by the [midiOutPrepareHeader] function. - LD83
