unit1.pas

Delphi6编程大师_多媒体

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.