frmlogin.frm

图书馆管理

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   2160
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   3855
   LinkTopic       =   "Form1"
   MinButton       =   0   'False
   Picture         =   "frmLogin.frx":0000
   ScaleHeight     =   1276.198
   ScaleMode       =   0  'User
   ScaleWidth      =   3619.636
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.TextBox txtUser 
      Height          =   345
      Left            =   1290
      TabIndex        =   1
      Top             =   135
      Width           =   2325
   End
   Begin VB.TextBox txtPassword 
      Height          =   345
      IMEMode         =   3  'DISABLE
      Left            =   1290
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   525
      Width           =   2325
   End
   Begin VB.Label Label1 
      BackStyle       =   0  'Transparent
      Caption         =   "确定"
      ForeColor       =   &H80000018&
      Height          =   255
      Left            =   840
      TabIndex        =   4
      Top             =   1680
      Width           =   495
   End
   Begin VB.Image ImageCancel 
      Height          =   855
      Left            =   2280
      Picture         =   "frmLogin.frx":15603
      Top             =   1200
      Width           =   810
   End
   Begin VB.Image ImageOK 
      Height          =   345
      Left            =   600
      Picture         =   "frmLogin.frx":17AC9
      Top             =   1200
      Width           =   945
   End
   Begin VB.Label lblLabels 
      BackColor       =   &H80000005&
      BackStyle       =   0  'Transparent
      Caption         =   "管理员ID(&U):"
      ForeColor       =   &H8000000E&
      Height          =   270
      Index           =   0
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      BackStyle       =   0  'Transparent
      Caption         =   "密码(&P):"
      ForeColor       =   &H8000000E&
      Height          =   270
      Index           =   1
      Left            =   120
      TabIndex        =   2
      Top             =   540
      Width           =   1080
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Dim cnt As Integer
Public LoginSucceeded As Boolean
Private Sub Form_Load()
Dim connectionstring As String
connectionstring = "provider=Microsoft.Jet.oledb.4.0;" & _
                   "data source=图书馆查询管理系统.mdb"
conn.Open connectionstring
cnt = 0
End Sub
Private Sub ImageCancel_Click()
'设置全局变量为 false
    '不提示失败的登录
    LoginSucceeded = False
    Me.Hide
    If MsgBox("确定退出本系统吗？", vbQuestion + vbYesNo, "退出系统") = vbYes Then
    Me.Hide
    Else
    Me.Show
    End If
    
End Sub
Private Sub ImageOK_Click()
Dim sql As String
Dim rs_login As New ADODB.Recordset
If Trim(txtUser.Text) = "" Then            '判断输入的用户名是否为空
   MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
   txtUser.SetFocus
Else
   sql = "select * from pass where 名称='" & txtUser.Text & "'"
   rs_login.Open sql, conn, adOpenKeyset, adLockPessimistic
   If rs_login.EOF = True Then
      MsgBox "没有这个用户", vbOKOnly + vbExclamation, ""
      txtUser.SetFocus
   Else                                  '检验密码是否正确
      If Trim(rs_login.Fields("密码")) = Trim(txtPassword.Text) Then
          userID = txtUser.Text
          userpow = rs_login.Fields("权限")
          strstatus = rs_login.Fields("权限")
          rs_login.Close
          Unload Me
          Form1.Show
      Else
         MsgBox "密码不正确", vbOKOnly + vbExclamation, ""
         txtPassword.SetFocus
      End If
   End If
End If
cnt = cnt + 1
If cnt = 3 Then
   Unload Me
End If
Exit Sub
Me.Hide
Form1.Show
End Sub

Private Sub txtuser_Change()
txtPassword = ""
End Sub