调整Mic音量

uses
  MMSystem;

function GetLineInHandle(AudioType : integer) : integer;
var
  i : integer;
  AudioCaps : TAuxCaps;
begin
  result := 0;
  for i := 0 to auxGetNumDevs - 1 do begin
    auxGetDevCaps(i, @AudioCaps, sizeof(AudioCaps));
    if AudioCaps.wTechnology = AudioType then begin
      Result := i;
      Break;
    end;
  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  v : DWORD;
begin
  AuxGetVolume(GetLineInHandle(AUXCAPS_CDAUDIO), @v);
  Edit1.Text := IntToStr(LoWord(v));
  Edit2.Text := IntToStr(HiWord(v));
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  v : DWORD;
begin
  v := MakeLong(Word(StrToInt(Edit1.Text)),
                Word(StrToInt(Edit2.Text)));
  AuxSetVolume(GetLineInHandle(AUXCAPS_CDAUDIO), v);
end;

procedure TForm1.Button3Click(Sender: TObject);
var
  v : DWORD;
begin
  AuxGetVolume(GetLineInHandle(AUXCAPS_AUXIN), @v);
  Edit3.Text := IntToStr(LoWord(v));
  Edit4.Text := IntToStr(HiWord(v));
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  v : DWORD;
begin
  v := MakeLong(Word(StrToInt(Edit3.Text)),
                Word(StrToInt(Edit4.Text)));
  AuxSetVolume(GetLineInHandle(AUXCAPS_AUXIN), v);
end;