frmlogin.frm

基于VB语言编写的热力学性质计算的应用软件（数据库操作）

VERSION 5.00
Begin VB.Form frmLogin 
   BackColor       =   &H00C0C0C0&
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "登录"
   ClientHeight    =   1545
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   3750
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   912.837
   ScaleMode       =   0  'User
   ScaleWidth      =   3521.047
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  'CenterScreen
   Begin VB.CommandButton Command1 
      BackColor       =   &H00FFC0C0&
      Caption         =   "密码更改"
      Height          =   339
      Left            =   1440
      Style           =   1  'Graphical
      TabIndex        =   6
      Top             =   1080
      Width           =   905
   End
   Begin VB.TextBox Text1 
      Height          =   345
      Left            =   1290
      TabIndex        =   1
      Top             =   135
      Width           =   2325
   End
   Begin VB.CommandButton cmdOK 
      BackColor       =   &H00FFC0C0&
      Caption         =   "确定"
      Default         =   -1  'True
      Height          =   339
      Left            =   240
      Style           =   1  'Graphical
      TabIndex        =   4
      Top             =   1080
      Width           =   905
   End
   Begin VB.CommandButton cmdCancel 
      BackColor       =   &H00FFC0C0&
      Cancel          =   -1  'True
      Caption         =   "取消"
      Height          =   339
      Left            =   2640
      Style           =   1  'Graphical
      TabIndex        =   5
      Top             =   1080
      Width           =   905
   End
   Begin VB.TextBox Text2 
      Height          =   345
      IMEMode         =   3  'DISABLE
      Left            =   1290
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   525
      Width           =   2325
   End
   Begin VB.Label lblLabels 
      BackColor       =   &H00C0C0C0&
      Caption         =   "用户名称(&U):"
      Height          =   270
      Index           =   0
      Left            =   105
      TabIndex        =   0
      Top             =   150
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      BackColor       =   &H00C0C0C0&
      Caption         =   "密码(&P):"
      Height          =   270
      Index           =   1
      Left            =   105
      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

Public LoginSucceeded As Boolean

Private Sub cmdCancel_Click()
    '设置全局变量为 false
    '不提示失败的登录
    LoginSucceeded = False
    Unload Me
End Sub

Private Sub cmdOK_Click()
    '检查正确的密码
Dim Username As String, Password As String, t As Integer
Static denglu
On Error GoTo a0
     myRecord.Index = "Username"
     myRecord.Seek "=", Text1.Text
     If myRecord.NoMatch Then
           MsgBox "用户名不存在！", vbOKCancel + 48, "登录"
           End
     End If
     Password = myRecord.Fields("Password").Value
     If Text2.Text = Password Then
         '将代码放在这里传递
        '成功到 calling 函数
        '设置全局变量时最容易的
        LoginSucceeded = True
        Unload Me
        Form1.Show
     Else
        denglu = denglu + 1
        MsgBox "无效的密码，请重试!", , "登录"
        Text2.SetFocus
        SendKeys "{Home}+{End}"
        If denglu >= 3 Then
           MsgBox "登陆超过三次请退出！", vbOKCancel + 48, "登录"
           Unload Me
        End If
     End If
Exit Sub
a0:
MsgBox "对不起!你无权登录!", vbOKCancel + 48, "登录"
Unload Me
End Sub

Private Sub Form_Load()
Set myWork = DBEngine.Workspaces(0)
Set myData = myWork.OpenDatabase(App.Path & "\物质参数.mdb", , ";")
Set myRecord = myData.OpenRecordset("登录名")

End Sub