login.pas

采用delphi软件对学生选课系统进行设计与制作

unit login;

interface

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

type
  Tlogfrm = class(TForm)
    Label1: TLabel;
    Label2: TLabel;
    Label3: TLabel;
    Edit1: TEdit;
    Edit2: TEdit;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    Table1: TTable;
    procedure FormCreate(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
    procedure Edit2KeyPress(Sender: TObject; var Key: Char);
    procedure BitBtn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  logfrm: Tlogfrm;
  count:integer;
  results:variant;
implementation

{$R *.dfm}

procedure Tlogfrm.FormCreate(Sender: TObject);
begin
  table1.Active:=true;
  count:=0 ;
end;

procedure Tlogfrm.BitBtn1Click(Sender: TObject);
begin
  count:=count+1;{计数加1}
  results:=table1.Lookup('name',edit1.text,'password');
  if results=edit2.Text then
    showmessage('密码确认，即将进入学生信息系统。')
  else
  begin
    showmessage('错误的用户名或密码！');
    if (count=3) then
      close;
  end;

end;

procedure Tlogfrm.Edit2KeyPress(Sender: TObject; var Key: Char);
begin

if (key=#13) then
  BitBtn1.Click
  else
end;
procedure Tlogfrm.BitBtn2Click(Sender: TObject);
begin
close;
end;

end.