delphi MediaPlayer1 设置音量

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uses

  MPlayer, MMSystem;

 

const

  MCI_SETAUDIO = $0873;

  MCI_DGV_SETAUDIO_VOLUME = $4002;

  MCI_DGV_SETAUDIO_ITEM = $00800000;

  MCI_DGV_SETAUDIO_VALUE = $01000000;

  MCI_DGV_STATUS_VOLUME = $4019;

 

type

  MCI_DGV_SETAUDIO_PARMS = record

    dwCallback: DWORD;

    dwItem: DWORD;

    dwValue: DWORD;

    dwOver: DWORD;

    lpstrAlgorithm: PChar;

    lpstrQuality: PChar;

  end;

 

type

  MCI_STATUS_PARMS = record

    dwCallback: DWORD;

    dwReturn: DWORD;

    dwItem: DWORD;

    dwTrack: DWORD;

  end;

 

procedure SetMPVolume(MP: TMediaPlayer; Volume: Integer);

  { Volume: 0 - 1000 }

var

  p: MCI_DGV_SETAUDIO_PARMS;

begin

  { Volume: 0 - 1000 }

  p.dwCallback := 0;

  p.dwItem := MCI_DGV_SETAUDIO_VOLUME;

  p.dwValue := Volume;

  p.dwOver := 0;

  p.lpstrAlgorithm := nil;

  p.lpstrQuality := nil;

  mciSendCommand(MP.DeviceID, MCI_SETAUDIO,

    MCI_DGV_SETAUDIO_VALUE or MCI_DGV_SETAUDIO_ITEM, Cardinal(@p));

end;

 

function GetMPVolume(MP: TMediaPlayer): Integer;

var

   p: MCI_STATUS_PARMS;

begin

  p.dwCallback := 0;

  p.dwItem := MCI_DGV_STATUS_VOLUME;

  mciSendCommand(MP.DeviceID, MCI_STATUS, MCI_STATUS_ITEM, Cardinal(@p));

  Result := p.dwReturn;

  { Volume: 0 - 1000 }

end;

 

// Example, Beispiel: 

 

procedure TForm1.Button1Click(Sender: TObject);

begin

  SetMPVolume(MediaPlayer1, 500);

end;

 

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