//音量控制 procedure TForm1.TrackBar1Change(Sender: TObject); var t,v:Longint; begin // if a=0 then Exit; t:=TrackBar1.Position; v:=(t shl 8)or(t shl 24); waveOutSetVolume(0,v); end; //左声道控制 procedure TForm1.TrackBar2Change(Sender: TObject); var t,v:Longint; begin t:=TrackBar2.Position; waveOutGetVolume(0,@v); v:=v and $ffff0000 or (t shl 8); waveOutSetVolume(0,v); end; //右声道控制 procedure TForm1.TrackBar3Change(Sender: TObject); var t,v:Longint; begin t:=TrackBar3.Position; waveOutGetVolume(0,@v); v:=v and $0000ffff or (t shl 24); waveOutSetVolume(0,v); end; //获得当前音量值 procedure TForm1.FormCreate(Sender: TObject); var v:longint; begin waveOutGetVolume(0,@v); TrackBar2.Position:=hi(v); TrackBar3.Position:=hi(v shr 16); if hi(v)>hi(v shr 16) then TrackBar1.Position:=hi(v) else TrackBar1.Position:=hi(v shr 16); end;
关闭声道 uses MMSystem; procedure SetMediaAudioOff(DeviceID : word); var SetParm : TMCI_SET_PARMS; begin SetParm.dwAudio := MCI_SET_AUDIO_ALL; mciSendCommand(DeviceID, MCI_SET, MCI_SET_AUDIO or MCI_SET_OFF, Longint(@SetParm)); end; Procedure SetMediaAudioOn(DeviceID : word); var SetParm : TMCI_SET_PARMS; begin SetParm.dwAudio := MCI_SET_AUDIO_ALL; mciSendCommand(DeviceID, MCI_SET, MCI_SET_AUDIO or MCI_SET_ON, Longint(@SetParm)); end; procedure TForm1.Button1Click(Sender: TObject); begin {Play AVI file silently} MediaPlayer1.FileName := 'C:\TheWall\DELCAR2.AVI'; MediaPlayer1.Display := Panel1; MediaPlayer1.Open; MediaPlayer1.Play; SetMediaAudioOff(MediaPlayer1.DeviceId); end; procedure TForm1.Button2Click(Sender: TObject); begin {Play AVI with sound} MediaPlayer1.FileName := 'C:\TheWall\DELCAR2.AVI'; MediaPlayer1.Display := Panel1; MediaPlayer1.Open; MediaPlayer1.Play; SetMediaAudioOn(MediaPlayer1.DeviceId); end;
procedure TForm1.TrackBar1Change(Sender: TObject);
var
t,v:Longint;
begin
// if a=0 then Exit;
t:=TrackBar1.Position;
v:=(t shl 8)or(t shl 24);
waveOutSetVolume(0,v);
end; //左声道控制
procedure TForm1.TrackBar2Change(Sender: TObject);
var
t,v:Longint;
begin
t:=TrackBar2.Position;
waveOutGetVolume(0,@v);
v:=v and $ffff0000 or (t shl 8);
waveOutSetVolume(0,v);
end; //右声道控制
procedure TForm1.TrackBar3Change(Sender: TObject);
var
t,v:Longint;
begin
t:=TrackBar3.Position;
waveOutGetVolume(0,@v);
v:=v and $0000ffff or (t shl 24);
waveOutSetVolume(0,v);
end; //获得当前音量值
procedure TForm1.FormCreate(Sender: TObject);
var
v:longint;
begin
waveOutGetVolume(0,@v);
TrackBar2.Position:=hi(v);
TrackBar3.Position:=hi(v shr 16);
if hi(v)>hi(v shr 16) then
TrackBar1.Position:=hi(v)
else
TrackBar1.Position:=hi(v shr 16);
end;
uses MMSystem; procedure SetMediaAudioOff(DeviceID : word);
var
SetParm : TMCI_SET_PARMS;
begin
SetParm.dwAudio := MCI_SET_AUDIO_ALL;
mciSendCommand(DeviceID,
MCI_SET,
MCI_SET_AUDIO or MCI_SET_OFF,
Longint(@SetParm));
end; Procedure SetMediaAudioOn(DeviceID : word);
var
SetParm : TMCI_SET_PARMS;
begin
SetParm.dwAudio := MCI_SET_AUDIO_ALL;
mciSendCommand(DeviceID,
MCI_SET,
MCI_SET_AUDIO or MCI_SET_ON,
Longint(@SetParm));
end; procedure TForm1.Button1Click(Sender: TObject);
begin
{Play AVI file silently}
MediaPlayer1.FileName := 'C:\TheWall\DELCAR2.AVI';
MediaPlayer1.Display := Panel1;
MediaPlayer1.Open;
MediaPlayer1.Play;
SetMediaAudioOff(MediaPlayer1.DeviceId);
end; procedure TForm1.Button2Click(Sender: TObject);
begin
{Play AVI with sound}
MediaPlayer1.FileName := 'C:\TheWall\DELCAR2.AVI';
MediaPlayer1.Display := Panel1;
MediaPlayer1.Open;
MediaPlayer1.Play;
SetMediaAudioOn(MediaPlayer1.DeviceId);
end;