unit Unit2;

interface

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

type
  TForm2 = class(TForm)
    Label1: TLabel;
    Edit1: TEdit;
    Label2: TLabel;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form2: TForm2;
  var1,var2:STRING;
implementation
    uses unit3;
{$R *.dfm}

procedure TForm2.Button1Click(Sender: TObject);
begin
var1:=Edit1.Text;
var2:=Edit2.Text;
if(var1='')and (var2='')then
ShowMessage('請(qǐng)輸入用戶名和密碼')
else if(var1<>'')and(var2='')then
ShowMessage('請(qǐng)輸入密碼')
else if(var1='')and(var2='')then
ShowMessage('請(qǐng)輸入用戶名')
else if(var1='qqq')and(var2='qqq')then
begin
ShowMessage('登陸成功');
form3.Show;
end
else
ShowMessage('對(duì)不起，您無權(quán)訪問');
end;


procedure TForm2.Button2Click(Sender: TObject);
begin
close;
end;

end.