📄 unit1.pas
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unit Unit1;
interface
uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
Mmsystem, StdCtrls, ExtCtrls;
type
TForm1 = class(TForm)
RadioGroup1: TRadioGroup;
Button1: TButton;
procedure Button1Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
function waveOutGetNumDevs: longint; stdcall;
external 'winmm.dll' name 'waveOutGetNumDevs';
{$R *.DFM}
procedure TForm1.Button1Click(Sender: TObject);
begin
if waveOutGetNumDevs=0 then
RadioGroup1.ItemIndex:=1
else
RadioGroup1.ItemIndex:=0;
end;
end.
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