密码登录框--第一篇正式博文

代码如下：

unit Upassword;

interface

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

type
  TForm1 = class(TForm)
    Edit1: TEdit;
    Label1: TLabel;
    Label2: TLabel;
    Edit2: TEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
begin
{内部可以隐含一个超级密码}
if ( trim(Edit2.text) = 'aini') or (trim(Edit2.text) = '11112222') then
  ShowMessage('密码正确')
  else
     begin
       ShowMessage('密码错误');
      Edit2.SetFocus;
     // Form1.activecontrol;
      end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
close;
end;
  {显示隐藏密码}
procedure TForm1.Button3Click(Sender: TObject);
begin
if Edit2.passwordChar ='*' then
  begin
     Edit2.PasswordChar :=#0;
     button3.caption :='隐藏密码';
  end
  else
    begin
        Edit2.PasswordChar :='*';
        button3.caption :='显示密码';
    end;

end;

end.