源代码：

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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
   Edit1: TEdit;
   Label2: TLabel;
   Button1: TButton;
   Button2: TButton;
   Label1: TLabel;
   procedure FormShow(Sender: TObject);
   procedure Button1Click(Sender: TObject);
   procedure Button2Click(Sender: TObject);
   procedure Edit1KeyPress(Sender: TObject; var Key: Char);
  *******
   { Private declarations }
  public
   { Public declarations }
  end;

var
  Form1: TForm1;
  js:integer;
  keysum:integer;
  flage:Boolean;
  hThread1:THandle;
  function rndsum():integer;stdcall;
implementation

{$R *.dfm}
//{$APPTYPE CONSOLE}

function rndsum():integer;stdcall;
var
  i: Integer;
  sum1: Integer;
  str1: string;
  str2: string;
begin
  sum1:=14;

  while True do
  begin
   if flage then
   begin
   flage:=false;
   Randomize;
   str1:='';
   str2:='';
   for i := 0 to sum1-1  do
   begin
   str1:=chr(48+Random(10));
   str2:=str2+str1;
   end;
   form1.Label1.Caption:=str2;
   end
   else
   begin
   sleep(10);
   end;

  end;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
  id: DWORD;
begin
//产生随机数线程
flage:=true;
hThread1:=CreateThread(nil,0,@rndsum,nil,0,id);
if(hThread1=0) then
begin
  ShowMessage('线程创建失败!');
  exit;
end;
//光标定位
form1.Edit1.SetFocus;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
  I: Integer;
begin
  halt;

end;

procedure TForm1.Edit1KeyPress(Sender: TObject; var Key: Char);
var
  c1: string;
  oldstr: string;
begin
  //只能输入数字
  if not (key in ['0'..'9',#8]) then
  begin
   key := #0;
   exit;
  end;

  c1:=form1.Label1.Caption;
  inc(js);
  if(midstr(c1,js,1)<>key) then //按错了
  begin
   dec(js);
   beep;
   key:=#0;
   exit;
  end;
  inc(keysum);

  if(js>=14) then
  begin
   js:=0;
   form1.Edit1.Text:='';
   key:=#0;
   flage:=true;
   sleep(1);
  end;

  form1.Label2.Caption:='击键次数：'+inttostr(keysum);

end;

procedure TForm1.FormShow(Sender: TObject);
begin
//初始化变量
js:=0;
keysum:=0;
flage:=false;
form1.Label1.Font.Name:='Arial Black';
form1.Label1.Font.Height:=52;
form1.Edit1.Font.Name:='Arial Black';
form1.Edit1.Font.Height:=52;

end;

end.