本文整理自网络，侵删。
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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