Устройство полуавтоматического поиска

unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Memo1: TMemo;
    Button1: TButton;
    procedure Memo1Change(Sender: TObject);
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  i:integer;Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Memo1Change(Sender: TObject);
var j:integer;
begin

i:= Memo1.Lines.Count;

If ((Memo1.Lines.Strings[i-1]) = (Edit1.Text)) and (memo1.CaretPos.X=0)  then
begin
j:=0;
repeat
j:=j+1;
Windows.Beep(800,200);
Windows.Beep(1000,200);

until j=5;
Showmessage('Ваш диск НАЙДЕН !!!!');
end;


end;

procedure TForm1.Button1Click(Sender: TObject);
begin
Memo1.SetFocus;
Memo1.Clear;
Memo1.SelStart:=0;
Memo1.SelLength:=0;
end;

end.