C# Signature:

[DllImport("winmm.dll", SetLastError=true)]
static extern UInt32 midiOutPrepareHeader(IntPtr hMidiOut, IntPtr lpMidiOutHdr, UInt32 cbMidiOutHdr); // LD83

VB Signature:

Declare Function midiOutPrepareHeader Lib "winmm.dll" (hMidiOut AS Intptr, lpMidiOutHdr AS IntPtr, cbMidiOutHdr) AS UInt32 ' LD83

User-Defined Types:

hMidiOut - Handle to the MIDI output device. This parameter can also be the handle of a MIDI stream cast to HMIDIOUT.

lpMidiOutHdr - Pointer to a MIDIHDR structure that identifies the buffer to be prepared.

cbMidiOutHdr - Size, in bytes, of the MIDIHDR structure.

Returns

Returns MMRESULT. Possible values are:

MMSYSERR_NOERROR - Successful

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.

Alternative Managed API:

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Notes:

None.

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Sample Code:

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