frmlogin.frm

这是个学生信息管理系统

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   3225
   ClientLeft      =   30
   ClientTop       =   330
   ClientWidth     =   5100
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3225
   ScaleWidth      =   5100
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  'CenterScreen
   Tag             =   "Login"
   Begin VB.CommandButton cmdCancel 
      Cancel          =   -1  'True
      Caption         =   "取消"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   360
      Left            =   2580
      TabIndex        =   4
      Tag             =   "Cancel"
      Top             =   1980
      Width           =   1140
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "确定"
      Default         =   -1  'True
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   360
      Left            =   960
      TabIndex        =   3
      Tag             =   "OK"
      Top             =   1980
      Width           =   1140
   End
   Begin VB.TextBox txtPassword 
      Height          =   288
      IMEMode         =   3  'DISABLE
      Left            =   1788
      PasswordChar    =   "*"
      TabIndex        =   2
      Top             =   1488
      Width           =   2325
   End
   Begin VB.TextBox txtUserName 
      Height          =   288
      Left            =   1788
      TabIndex        =   1
      Top             =   1092
      Width           =   2325
   End
   Begin VB.Label Label2 
      Caption         =   "江汉大学 计算机科学系 2002级"
      BeginProperty Font 
         Name            =   "仿宋_GB2312"
         Size            =   15
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   372
      Left            =   240
      TabIndex        =   7
      Top             =   2640
      Width           =   4812
   End
   Begin VB.Label Label1 
      Caption         =   "学生信息管理系统"
      BeginProperty Font 
         Name            =   "华文中宋"
         Size            =   23.25
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      ForeColor       =   &H80000006&
      Height          =   735
      Left            =   600
      TabIndex        =   6
      Top             =   240
      Width           =   4215
   End
   Begin VB.Label lblLabels 
      Caption         =   "用户密码"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   0
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   252
      Index           =   1
      Left            =   588
      TabIndex        =   0
      Top             =   1500
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      Caption         =   "用户名"
      BeginProperty Font 
         Name            =   "宋体"
         Size            =   10.5
         Charset         =   134
         Weight          =   700
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   252
      Index           =   0
      Left            =   720
      TabIndex        =   5
      Tag             =   "&User Name:"
      Top             =   1116
      Width           =   840
   End
End
Attribute VB_Name = "frmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit
Private Declare Function GetUserName Lib "advapi32.dll" Alias "GetUserNameA" (ByVal lpbuffer As String, nSize As Long) As Long
Public PasswordKey As String
Public NameKey As String
Public Try_times As Integer


Public OK As Boolean
'记录确定次数
Dim miCount As Integer

Private Sub form_load()
    Dim sBuffer As String
    Dim lSize As Long


    sBuffer = Space$(255)
    lSize = Len(sBuffer)
    Call GetUserName(sBuffer, lSize)
    If lSize > 0 Then
        txtUserName.text = ""
   
    Else
        txtUserName.text = vbNullString
    End If
    

    OK = False
    miCount = 0
End Sub



Private Sub cmdCancel_Click()
    OK = False
    Me.Hide
End Sub
Private Sub cmdOK_Click()
   If txtUserName = "" Then
   MsgBox "请输入用户名"
   txtUserName.SetFocus
   Exit Sub
   End If
   If txtPassword = "" Then
   txtPassword.SetFocus
   Exit Sub
   End If
   NameKey = MakeStr(txtUserName)
   PasswordKey = MakeStr(txtPassword)
   If MyUser.In_DB(NameKey) = False Then
   MsgBox "用户不存在"
   Try_times = Try_times + 1
   If Try_times >= 3 Then
    MsgBox "您已经三次尝试进入本系统，均不成功，系统将关闭"
      DBapi_Disconnect
      End
    Else
      Exit Sub
    End If
  End If
  
  '判断密码是否正确

  MyUser.GetInfo (NameKey)
  If MyUser.user_PWD <> PasswordKey Then
    MsgBox "密码错误"
    Try_times = Try_times + 1
    If Try_times >= 3 Then
      MsgBox "您已经三次尝试进入本系统，均不成功，系统将关闭"
      DBapi_Disconnect
      End
    Else
      Exit Sub
    End If
  End If
  
'登录成功，将当前用户的信息保存在CurUser中
  CurUser.user_ID = MyUser.user_ID
  OK = True

'关闭自己
  Me.Hide
  
End Sub