frmlogin.frm

一个小型管理系统.~!!不同的用户拥有不同的权限

VERSION 5.00
Begin VB.Form FrmLogin 
   BorderStyle     =   1  'Fixed Single
   Caption         =   "欢迎登陆!"
   ClientHeight    =   3090
   ClientLeft      =   45
   ClientTop       =   435
   ClientWidth     =   4680
   ControlBox      =   0   'False
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   3090
   ScaleWidth      =   4680
   StartUpPosition =   2  '屏幕中心
   Begin VB.Frame Frame1 
      BackColor       =   &H8000000B&
      Height          =   2535
      Left            =   360
      TabIndex        =   0
      Top             =   240
      Width           =   3975
      Begin VB.TextBox TxtPwd 
         Height          =   375
         IMEMode         =   3  'DISABLE
         Left            =   1560
         PasswordChar    =   "*"
         TabIndex        =   6
         Text            =   "Admin"
         Top             =   1200
         Width           =   2055
      End
      Begin VB.CommandButton Cmd_Cancel 
         BackColor       =   &H80000010&
         Caption         =   "取 消"
         Height          =   495
         Left            =   2400
         TabIndex        =   5
         Top             =   1920
         Width           =   1215
      End
      Begin VB.CommandButton Cmd_OK 
         BackColor       =   &H8000000C&
         Caption         =   "确 定"
         Height          =   495
         Left            =   360
         MaskColor       =   &H000000C0&
         TabIndex        =   4
         Top             =   1920
         Width           =   1215
      End
      Begin VB.TextBox TxtUser 
         Height          =   375
         Left            =   1560
         TabIndex        =   3
         Text            =   "Admin"
         Top             =   360
         Width           =   2055
      End
      Begin VB.Label Label2 
         BackStyle       =   0  'Transparent
         Caption         =   "密  码："
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   14.25
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   495
         Left            =   240
         TabIndex        =   2
         Top             =   1320
         Width           =   1455
      End
      Begin VB.Label Label1 
         BackStyle       =   0  'Transparent
         Caption         =   "用户名："
         BeginProperty Font 
            Name            =   "楷体_GB2312"
            Size            =   14.25
            Charset         =   134
            Weight          =   700
            Underline       =   0   'False
            Italic          =   0   'False
            Strikethrough   =   0   'False
         EndProperty
         Height          =   375
         Left            =   240
         TabIndex        =   1
         Top             =   360
         Width           =   1335
      End
   End
End
Attribute VB_Name = "FrmLogin"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public PasswordKey As String
Public NameKey As String
Public Try_times As Integer

Private Sub Cmd_Cancel_Click()
  End
End Sub

Private Sub Cmd_OK_Click()
 Dim j As Single

  '数据有效性检查
  If TxtUser = "" Then
    MsgBox "请输入用户名"
    TxtUser.SetFocus
    Exit Sub
  End If
  If TxtPwd = "" Then
    MsgBox "请输入密码"
    TxtPwd.SetFocus
    Exit Sub
  End If
 
  NameKey = MakeStr(TxtUser)
  PasswordKey = MakeStr(TxtPwd)
   
'判断用户是否存在
  If MyUser.In_DB(NameKey) = False Then
    MsgBox "用户名不存在"
    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.UserPwd <> 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.GetInfo (NameKey)
'关闭自己
  Unload Me
End Sub