乐
乐子
Unregistered / Unconfirmed
GUEST, unregistred user!
请问怎样控制音量及左右声道??
有位仁兄贴了这样的回贴
转贴的:
但运行后却报错
Undeclared identifier: 'waveOutSetVolume'
应该怎样才对呢??请教大家了
//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;
有位仁兄贴了这样的回贴
转贴的:
但运行后却报错
Undeclared identifier: 'waveOutSetVolume'
应该怎样才对呢??请教大家了
//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;