frmlogin.frm

小弟变动过的经典图书管理系统

VERSION 5.00
Begin VB.Form 身份验证 
   AutoRedraw      =   -1  'True
   BackColor       =   &H00C0C0C0&
   Caption         =   "欢迎进入图书馆管理系统"
   ClientHeight    =   1755
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   3270
   LinkTopic       =   "Form1"
   ScaleHeight     =   1755
   ScaleWidth      =   3270
   StartUpPosition =   1  '所有者中心
   Begin VB.Timer Timer1 
      Interval        =   500
      Left            =   1440
      Top             =   1320
   End
   Begin VB.TextBox text1 
      BackColor       =   &H00FFFFFF&
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      Left            =   1320
      TabIndex        =   2
      Top             =   120
      Width           =   1815
   End
   Begin VB.TextBox text2 
      BackColor       =   &H00FFFFFF&
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   12
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   1320
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   720
      Width           =   1815
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "确 定"
      Default         =   -1  'True
      Height          =   375
      Left            =   120
      TabIndex        =   4
      Top             =   1320
      Width           =   1215
   End
   Begin VB.CommandButton cmdCancle 
      Caption         =   "取消"
      Height          =   375
      Left            =   1920
      TabIndex        =   5
      Top             =   1320
      Width           =   1215
   End
   Begin VB.Label Label1 
      BackColor       =   &H00C0C0C0&
      Caption         =   "用户名："
      Height          =   255
      Left            =   240
      TabIndex        =   0
      Top             =   240
      Width           =   735
   End
   Begin VB.Label Label2 
      BackColor       =   &H00C0C0C0&
      Caption         =   "密码："
      Height          =   255
      Left            =   240
      TabIndex        =   1
      Top             =   840
      Width           =   615
   End
End
Attribute VB_Name = "身份验证"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim cnt As Integer '记录确定次数
Private Declare Function FlashWindow Lib "user32" (ByVal hwnd As Long, ByVal bInvert As Long) As Long
Private Sub cmdCancle_Click()
 Unload Me
End Sub

Private Sub cmdOK_Click()

Dim sql As String

Dim rs_login As New ADODB.Recordset
Dim conn As New ADODB.Connection

conn.Open "provider=Microsoft.Jet.OLEDB.4.0; data source=" & App.Path & "\database.mdb"
 
'判断用户名是否为空
 If Trim(Text1.Text) = "" Then
   MsgBox "用户名不能为空，请重新输入！"
   Text1.SetFocus
 '用户名不空
 Else
   '打开数据库
   sql = "select * from 用户表 where user_ID='" & Trim(Text1.Text) & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   '没有输入的用户
   If rs_login.EOF = True Then
     MsgBox "没有这个用户,请重输入！", vbOKOnly + vbExclamation, ""
     Text1.Text = ""
     Text1.SetFocus
   '有用户
   Else
     username = Text1.Text
     If Trim(rs_login.Fields(1)) = Trim(Text2.Text) Then '密码验证OK
          
        '记录登陆用户及其时间
        Open "E:\案例\经典图书管理系统\登陆日志.txt" For Append As #1
        Write #1, username & "  " & "于" & "  " & Now & "  " & "登陆！"
        Close #1
        
        Unload Me
        图书管理系统.Show
     Else
        MsgBox "密码不正确,请重输入！", vbOKOnly + vbExclamation, ""
        Text2.SetFocus
        Text2.Text = ""
     End If
   End If
 End If
 cnt = cnt + 1
 If cnt = 3 Then
  Unload Me
 End If
End Sub

Private Sub Form_Load()
cnt = 0
End Sub
Private Sub Timer1_Timer()
Call FlashWindow(Me.hwnd, True)
End Sub