捕捉 midi 输入消息的基本程序

uses MMSystem;

var hMidiIn: Integer;

procedure midiCallBack(hdrvr: HDRVR; uMsg: UINT; dwUser: DWORD; dw1, dw2: DWORD) stdcall;
begin
  case uMsg of
    MIM_OPEN: ;
    MIM_CLOSE: ;
    MIM_DATA: Form1.Memo1.Lines.Add(IntToStr(dw1));
    MIM_LONGDATA: ;
    MIM_ERROR: ;
    MIM_LONGERROR: ;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  midiInOpen(@hMidiIn, 0, Cardinal(@midiCallBack), 0, CALLBACK_FUNCTION);
  midiInStart(hMidiIn);
  Caption := IntToStr(hMidiIn);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  midiInStop(hMidiIn);
  midiInClose(hMidiIn);
  Caption := '0'
end;

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参考: http://msdn.microsoft.com/en-us/library/ms709430(VS.85).aspx

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