frmlogin.frm

是一个 学生管理系统

VERSION 5.00
Begin VB.Form Frmlogin 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "学籍管理系统登陆"
   ClientHeight    =   1500
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   3630
   Icon            =   "Frmlogin.frx":0000
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   1500
   ScaleWidth      =   3630
   StartUpPosition =   1  '所有者中心
   Begin VB.CommandButton cmdOKCancel 
      Caption         =   "取消（&C）"
      Height          =   330
      Index           =   1
      Left            =   2160
      Style           =   1  'Graphical
      TabIndex        =   3
      Top             =   1080
      Width           =   930
   End
   Begin VB.CommandButton cmdOKCancel 
      Caption         =   "确定（&O）"
      Default         =   -1  'True
      Height          =   330
      Index           =   0
      Left            =   600
      Style           =   1  'Graphical
      TabIndex        =   2
      Top             =   1080
      Width           =   930
   End
   Begin VB.TextBox txtPassword 
      BackColor       =   &H00FFFFFF&
      ForeColor       =   &H00000000&
      Height          =   300
      IMEMode         =   3  'DISABLE
      Left            =   1080
      PasswordChar    =   "*"
      TabIndex        =   1
      ToolTipText     =   "请输入登陆密码！"
      Top             =   540
      Width           =   2205
   End
   Begin VB.TextBox txtuser 
      Height          =   300
      IMEMode         =   3  'DISABLE
      Left            =   1080
      TabIndex        =   0
      ToolTipText     =   "请输入登陆的用户名"
      Top             =   120
      Width           =   2205
   End
   Begin VB.Label lblLabels 
      AutoSize        =   -1  'True
      BackStyle       =   0  'Transparent
      Caption         =   "密  码："
      ForeColor       =   &H00000000&
      Height          =   180
      Index           =   1
      Left            =   360
      TabIndex        =   5
      Top             =   600
      Width           =   720
   End
   Begin VB.Line Line1 
      X1              =   0
      X2              =   3600
      Y1              =   960
      Y2              =   960
   End
   Begin VB.Line Line2 
      BorderColor     =   &H80000005&
      X1              =   120
      X2              =   2880
      Y1              =   960
      Y2              =   960
   End
   Begin VB.Label lblLabels 
      AutoSize        =   -1  'True
      BackStyle       =   0  'Transparent
      Caption         =   "用户名："
      ForeColor       =   &H00000000&
      Height          =   180
      Index           =   0
      Left            =   360
      TabIndex        =   4
      Top             =   180
      Width           =   720
   End
End
Attribute VB_Name = "Frmlogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Dim loginno As Integer
Private Sub cmdOkCancel_Click(Index As Integer)
   
   Select Case Index
      Case 0
        'On Error Resume Next

       '检测txtuser控件
       If Trim(txtuser.Text) = "" Then
          MsgBox "用户名不能为空！", vbQuestion
          txtuser.Text = ""
          txtuser.SetFocus
          Exit Sub
       End If

       If InStr(1, Trim(txtuser.Text), "'", 1) Then
           MsgBox "用户名中不能包含'号！", vbQuestion
           txtuser.Text = ""
           txtuser.SetFocus
           Exit Sub
        End If
        
        Userid = Trim(txtuser.Text)
        Userpwd = MD5(Trim(txtPassword.Text))
    
        sqlstr = "select * from UserInfo where UserID='" & Userid & "'"
        rs.Open sqlstr, con, 1, 1
    
    If Not rs.EOF Then
        If rs("UserPWD") <> Userpwd Then
           '密码错误时
            MsgBox "您输入的密码不正确！", vbQuestion
            Me.Caption = "请输入用户名和密码："

            loginno = loginno + 1
            
            '当错误的密码次数达到3次时，不能登陆，退出！
            If loginno = 3 Then
                MsgBox "对不起，您不能使用该系统！请与管理员联系。", vbInformation
                Unload Me
                Exit Sub
            End If
            txtPassword.SelStart = 0
            txtPassword.SelLength = Len(txtPassword.Text)
            txtPassword.SetFocus
         Else
           LoginUser = Userid
           LoginPower = rs.Fields(3)
           Unload Me
           Frmmain.Show
         End If
    Else
        MsgBox "没有您输入的用户名！", 32
        txtuser.SelStart = 0
        txtuser.SelLength = Len(txtuser.Text)
        txtuser.SetFocus
    End If

    
    rs.Close: Set rs = Nothing
     Case 1
        Unload Me
   End Select
End Sub

Private Sub Form_Load()
   loginno = 0
   Me.Show
   txtuser.SetFocus
   txtuser.Text = "Administrator"
   txtPassword.Text = "Administrator"
End Sub