frmlogin.frm

这是一个用VB编写的用于外贸行业的供应商信息管理系统。

VERSION 5.00
Begin VB.Form frmLogin 
   BorderStyle     =   3  'Fixed Dialog
   Caption         =   "login"
   ClientHeight    =   3060
   ClientLeft      =   2835
   ClientTop       =   3480
   ClientWidth     =   5550
   LinkTopic       =   "Form1"
   MaxButton       =   0   'False
   MinButton       =   0   'False
   ScaleHeight     =   1807.949
   ScaleMode       =   0  'User
   ScaleWidth      =   5211.149
   ShowInTaskbar   =   0   'False
   StartUpPosition =   2  '屏幕中心
   Begin VB.TextBox txtUserName 
      Height          =   345
      Left            =   1920
      TabIndex        =   1
      Top             =   720
      Width           =   2325
   End
   Begin VB.CommandButton cmdOK 
      Caption         =   "&ok"
      Default         =   -1  'True
      Height          =   390
      Left            =   1320
      TabIndex        =   4
      Top             =   2280
      Width           =   1140
   End
   Begin VB.CommandButton cmdCancel 
      Cancel          =   -1  'True
      Caption         =   "&cancel"
      Height          =   390
      Left            =   3120
      TabIndex        =   5
      Top             =   2280
      Width           =   1140
   End
   Begin VB.TextBox txtPassword 
      Height          =   345
      IMEMode         =   3  'DISABLE
      Left            =   1920
      PasswordChar    =   "*"
      TabIndex        =   3
      Top             =   1440
      Width           =   2325
   End
   Begin VB.Label lblLabels 
      Caption         =   "&username:"
      Height          =   270
      Index           =   0
      Left            =   720
      TabIndex        =   0
      Top             =   840
      Width           =   1080
   End
   Begin VB.Label lblLabels 
      Caption         =   "&password:"
      Height          =   270
      Index           =   1
      Left            =   720
      TabIndex        =   2
      Top             =   1440
      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
Public cn As New ADODB.Connection
Public rs As New ADODB.Recordset


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
    Set rs = New ADODB.Recordset
    rs.Open "select * from users where username='" & txtUsername.Text & "' and password='" & txtPassword.Text & "'", cn, adOpenDynamic
    If rs.EOF <> True Then
        LoginSucceeded = True
        rs.Close
        cn.Close
        Unload Me
        frmMain.Show
    Else
        MsgBox "username or password is error，repeat it!", vbCritical, "Login"
        txtUsername.SetFocus
        SendKeys "{Home}+{End}"
        rs.Close
    End If
End Sub

Private Sub Form_Load()
    strCn = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=supplierDB.mdb;Persist Security Info=False"
    Set cn = New ADODB.Connection
    cn.Open strCn
End Sub

Private Sub txtPassword_gotfocus()
    txtPassword.SelStart = 0
    txtPassword.SelLength = Len(txtPassword.Text)
End Sub

Private Sub txtUsername_gotfocus()
    txtUsername.SelStart = 0
    txtUsername.SelLength = Len(txtUsername.Text)
End Sub