frmlogin.frm

一个自己做的电力管理系统,主要用于电力电业行业的管理

VERSION 5.00
Begin VB.Form frmLogin 
   BackColor       =   &H80000014&
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   3495
   ClientLeft      =   45
   ClientTop       =   330
   ClientWidth     =   6330
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3495
   ScaleWidth      =   6330
   ShowInTaskbar   =   0   'False
   StartUpPosition =   3  '窗口缺省
   Begin VB.PictureBox Picture1 
      AutoSize        =   -1  'True
      Height          =   285
      Left            =   600
      Picture         =   "frmLogin.frx":0000
      ScaleHeight     =   225
      ScaleWidth      =   225
      TabIndex        =   8
      Top             =   240
      Width           =   285
   End
   Begin VB.TextBox txtPassword 
      BackColor       =   &H00C0FFFF&
      Height          =   375
      IMEMode         =   3  'DISABLE
      Left            =   2520
      PasswordChar    =   "*"
      TabIndex        =   6
      Text            =   "123"
      Top             =   2160
      Width           =   1935
   End
   Begin VB.TextBox txtUser 
      BackColor       =   &H00C0FFFF&
      Height          =   375
      Left            =   2520
      TabIndex        =   5
      Text            =   "wangxiaoliang"
      Top             =   1440
      Width           =   1935
   End
   Begin VB.CommandButton cmdExit 
      Height          =   300
      Left            =   3720
      Picture         =   "frmLogin.frx":00A4
      Style           =   1  'Graphical
      TabIndex        =   2
      Top             =   2880
      Width           =   1095
   End
   Begin VB.CommandButton cmdOK 
      Height          =   300
      Left            =   1560
      Picture         =   "frmLogin.frx":05FF
      Style           =   1  'Graphical
      TabIndex        =   1
      Top             =   2880
      Width           =   1095
   End
   Begin VB.Label Label4 
      BackColor       =   &H8000000E&
      Caption         =   "郑州大学教师管理系统"
      BeginProperty Font 
         Name            =   "MS Sans Serif"
         Size            =   24
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H0000FF00&
      Height          =   615
      Left            =   840
      TabIndex        =   7
      Top             =   600
      Width           =   5655
   End
   Begin VB.Label Label3 
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      Caption         =   "密码："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   11.25
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FF0000&
      Height          =   255
      Left            =   1080
      TabIndex        =   4
      Top             =   2160
      Width           =   855
   End
   Begin VB.Label Label2 
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      Caption         =   "用户名："
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   11.25
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H00FF0000&
      Height          =   255
      Left            =   1080
      TabIndex        =   3
      Top             =   1560
      Width           =   975
   End
   Begin VB.Label Label1 
      Appearance      =   0  'Flat
      BackColor       =   &H80000005&
      Caption         =   "  欢迎进入"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   18
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   -1  'True
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H0000FF00&
      Height          =   375
      Left            =   480
      TabIndex        =   0
      Top             =   120
      Width           =   5295
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Public LoginSucceeded As Boolean
'退出窗体
Private Sub cmdExit_Click()
  LoginSucceeded = False
  Unload Me
End Sub
'检验数据
Private Sub cmdOK_Click()
   Set rs = New ADODB.Recordset
   Set rs = CN.Execute("select  * From 系统用户")
   If rs.EOF Then           '若数据库中没有用户时，允许进入
       rs.Close
       Set rs = Nothing
       Unload Me
       Load frmMain
       Exit Sub
   End If
   rs.MoveFirst
   Do
     If rs.Fields("username") = txtUser.Text Then
         If rs.Fields("password") = txtPassword.Text Then
              LoginSucceeded = True
              rs.Close
              Unload Me
              Load frmMain
              frmMain.Show
              Exit Sub
              Exit Do
          End If
      End If
      rs.MoveNext
    Loop Until rs.EOF
    If rs.EOF Then         '用户名或者密码不对时
       MsgBox "无效密码或用户名请重试!", , "Login"
       txtUser.SetFocus
    End If
    Exit Sub
errh:                              '错误处理
    MsgBox Err.Description
End Sub

Private Sub Form_Load()
    
    Dim s As String
    MakeCenter frmLogin      '窗体位于屏幕中间
    
    s = MakeConnection()     '创建全局ADO连接
    If s <> "OK" Then
        MsgBox s, , "错误！"
        Unload Me
        LoginSucceeded = False
        End If
        
End Sub

Private Sub Form_Unload(Cancel As Integer)
    If Not LoginSucceeded Then '如果登陆失败
        CN.Close '释放连接
        Set CN = Nothing
    End If
End Sub