unit11.pas

学生管理系统(delphi7.0+sql2000) 对学生基本信息,学生成绩,课程进行插,删,改功能

unit Unit11;

interface

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

type
  TForm11 = class(TForm)
    Panel1: TPanel;
    Label1: TLabel;
    Edit1: TEdit;
    BitBtn1: TBitBtn;
    BitBtn2: TBitBtn;
    Label2: TLabel;
    ComboBox1: TComboBox;
    procedure FormCreate(Sender: TObject);
    procedure BitBtn1Click(Sender: TObject);
    procedure BitBtn2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form11: TForm11;
   entertime:integer;

implementation

{$R *.dfm}

procedure TForm11.FormCreate(Sender: TObject);
begin
entertime:=0;
end;

procedure TForm11.BitBtn1Click(Sender: TObject);
var
pwfile1:textfile;
password1:string;
pwfile2:textfile;
password2:string;
begin
 if ComboBox1.text='教师' then
      begin
            assignfile(pwfile1,'教师登录密码.txt');
             reset(pwfile1);
            readln(pwfile1,password1);
             closefile(pwfile1);
            inc(entertime);
             if edit1.text=Password1 then
            close

            else
begin
label1.Caption:='密码输入错误，请重新输入：';
if entertime>=3 then
begin
messagebox(handle,'输入密码错误超过三次，程序退出!','信息',MB_ok);
close;
application.terminate;
end else
begin
edit1.Text:='';
edit1.SetFocus;
end;
end;
end
else
 begin
assignfile(pwfile2,'学生登录密码.txt');
reset(pwfile2);
readln(pwfile2,password2);
closefile(pwfile2);
inc(entertime);
if edit1.text=Password2 then
close

else
begin
label1.Caption:='密码输入错误，请重新输入：';
if entertime>=3 then
begin
messagebox(handle,'输入密码错误超过三次，程序退出!','信息',MB_ok);
close;
application.terminate;
end else
begin
edit1.Text:='';
edit1.SetFocus;
end;
end;
end;

end;

procedure TForm11.BitBtn2Click(Sender: TObject);
begin
close;
application.terminate;
end;

end.