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  ±è¿µ´ë(2003-03-06 21:54:53, Hit : 4752, Vote : 1296
 ¸¶ÀÌÅ© º¼·ý Á¶ÀýÇϱâ

> Q) How can I change the volume of the CD Audio and LineIn device?
>
> A) The following example demonstrates getting and setting the volume
>    for the first CDAudio and LineIn device found. Note that both left and right
>    channels are supported. The volume range is from 0 to 65535.
>
> Example:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, MMSystem;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    Edit1: TEdit;
    Edit2: TEdit;
    Edit3: TEdit;
    Edit4: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation
{$R *.DFM}

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;

end.





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