frmlogin.vb

<Visual Basic 数据库开发实例精粹（第二版）>一书首先介绍了Visual Basic(简称VB)开发的技巧和重点技术

Public Class frmLogin
  Inherits System.Windows.Forms.Form

  Public m_bLoginSuccess As Boolean   '是否登录成功

#Region " Windows 窗体设计器生成的代码 "

  Public Sub New()
    MyBase.New()

    '该调用是 Windows 窗体设计器所必需的。
    InitializeComponent()

    '在 InitializeComponent() 调用之后添加任何初始化

  End Sub

  '窗体重写 dispose 以清理组件列表。
  Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
    If disposing Then
      If Not (components Is Nothing) Then
        components.Dispose()
      End If
    End If
    MyBase.Dispose(disposing)
  End Sub

  'Windows 窗体设计器所必需的
  Private components As System.ComponentModel.IContainer

  '注意: 以下过程是 Windows 窗体设计器所必需的
  '可以使用 Windows 窗体设计器修改此过程。
  '不要使用代码编辑器修改它。
  Public WithEvents ToolTip1 As System.Windows.Forms.ToolTip
  Public WithEvents cmdOK As System.Windows.Forms.Button
  Public WithEvents cmdExit As System.Windows.Forms.Button
  Public WithEvents picBG As System.Windows.Forms.Panel
  Public WithEvents _lblLogin_1 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_2 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_3 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_0 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_4 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_5 As System.Windows.Forms.Label
  Public WithEvents _lblLogin_6 As System.Windows.Forms.Label
  Public WithEvents fraLogin As System.Windows.Forms.GroupBox
  Public WithEvents imgloginLogo As System.Windows.Forms.PictureBox
  Public WithEvents txtUser As System.Windows.Forms.TextBox
  Public WithEvents txtPwd As System.Windows.Forms.TextBox
  <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
    Me.components = New System.ComponentModel.Container
    Dim resources As System.Resources.ResourceManager = New System.Resources.ResourceManager(GetType(frmLogin))
    Me.ToolTip1 = New System.Windows.Forms.ToolTip(Me.components)
    Me.txtPwd = New System.Windows.Forms.TextBox
    Me.cmdOK = New System.Windows.Forms.Button
    Me.fraLogin = New System.Windows.Forms.GroupBox
    Me.txtUser = New System.Windows.Forms.TextBox
    Me.cmdExit = New System.Windows.Forms.Button
    Me.picBG = New System.Windows.Forms.Panel
    Me._lblLogin_3 = New System.Windows.Forms.Label
    Me._lblLogin_1 = New System.Windows.Forms.Label
    Me._lblLogin_2 = New System.Windows.Forms.Label
    Me._lblLogin_0 = New System.Windows.Forms.Label
    Me._lblLogin_4 = New System.Windows.Forms.Label
    Me._lblLogin_5 = New System.Windows.Forms.Label
    Me.imgloginLogo = New System.Windows.Forms.PictureBox
    Me._lblLogin_6 = New System.Windows.Forms.Label
    Me.fraLogin.SuspendLayout()
    Me.picBG.SuspendLayout()
    Me.SuspendLayout()
    '
    'txtPwd
    '
    Me.txtPwd.AcceptsReturn = True
    Me.txtPwd.AutoSize = False
    Me.txtPwd.BackColor = System.Drawing.SystemColors.Window
    Me.txtPwd.Cursor = System.Windows.Forms.Cursors.IBeam
    Me.txtPwd.ForeColor = System.Drawing.SystemColors.WindowText
    Me.txtPwd.Location = New System.Drawing.Point(124, 152)
    Me.txtPwd.MaxLength = 0
    Me.txtPwd.Name = "txtPwd"
    Me.txtPwd.PasswordChar = Microsoft.VisualBasic.ChrW(42)
    Me.txtPwd.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.txtPwd.Size = New System.Drawing.Size(174, 22)
    Me.txtPwd.TabIndex = 3
    Me.txtPwd.Text = "Admin"
    Me.ToolTip1.SetToolTip(Me.txtPwd, "请输入密码")
    '
    'cmdOK
    '
    Me.cmdOK.BackColor = System.Drawing.SystemColors.Control
    Me.cmdOK.Cursor = System.Windows.Forms.Cursors.Default
    Me.cmdOK.ForeColor = System.Drawing.SystemColors.ControlText
    Me.cmdOK.Location = New System.Drawing.Point(96, 184)
    Me.cmdOK.Name = "cmdOK"
    Me.cmdOK.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.cmdOK.Size = New System.Drawing.Size(84, 25)
    Me.cmdOK.TabIndex = 0
    Me.cmdOK.Text = "登录(&O)"
    Me.ToolTip1.SetToolTip(Me.cmdOK, "登录")
    '
    'fraLogin
    '
    Me.fraLogin.BackColor = System.Drawing.SystemColors.Control
    Me.fraLogin.Controls.Add(Me.txtUser)
    Me.fraLogin.Controls.Add(Me.txtPwd)
    Me.fraLogin.Controls.Add(Me.cmdOK)
    Me.fraLogin.Controls.Add(Me.cmdExit)
    Me.fraLogin.Controls.Add(Me.picBG)
    Me.fraLogin.Controls.Add(Me._lblLogin_4)
    Me.fraLogin.Controls.Add(Me._lblLogin_5)
    Me.fraLogin.Controls.Add(Me.imgloginLogo)
    Me.fraLogin.Controls.Add(Me._lblLogin_6)
    Me.fraLogin.FlatStyle = System.Windows.Forms.FlatStyle.Popup
    Me.fraLogin.ForeColor = System.Drawing.SystemColors.ControlText
    Me.fraLogin.Location = New System.Drawing.Point(0, -8)
    Me.fraLogin.Name = "fraLogin"
    Me.fraLogin.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.fraLogin.Size = New System.Drawing.Size(421, 264)
    Me.fraLogin.TabIndex = 5
    Me.fraLogin.TabStop = False
    '
    'txtUser
    '
    Me.txtUser.AcceptsReturn = True
    Me.txtUser.AutoSize = False
    Me.txtUser.BackColor = System.Drawing.SystemColors.Window
    Me.txtUser.Cursor = System.Windows.Forms.Cursors.IBeam
    Me.txtUser.ForeColor = System.Drawing.SystemColors.WindowText
    Me.txtUser.Location = New System.Drawing.Point(124, 120)
    Me.txtUser.MaxLength = 0
    Me.txtUser.Name = "txtUser"
    Me.txtUser.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.txtUser.Size = New System.Drawing.Size(174, 22)
    Me.txtUser.TabIndex = 2
    Me.txtUser.Text = "Admin"
    '
    'cmdExit
    '
    Me.cmdExit.BackColor = System.Drawing.SystemColors.Control
    Me.cmdExit.Cursor = System.Windows.Forms.Cursors.Default
    Me.cmdExit.DialogResult = System.Windows.Forms.DialogResult.Cancel
    Me.cmdExit.ForeColor = System.Drawing.SystemColors.ControlText
    Me.cmdExit.Location = New System.Drawing.Point(196, 184)
    Me.cmdExit.Name = "cmdExit"
    Me.cmdExit.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.cmdExit.Size = New System.Drawing.Size(84, 25)
    Me.cmdExit.TabIndex = 4
    Me.cmdExit.Text = "退出(&E)"
    '
    'picBG
    '
    Me.picBG.BackColor = System.Drawing.Color.FromArgb(CType(128, Byte), CType(128, Byte), CType(128, Byte))
    Me.picBG.Controls.Add(Me._lblLogin_3)
    Me.picBG.Controls.Add(Me._lblLogin_1)
    Me.picBG.Controls.Add(Me._lblLogin_2)
    Me.picBG.Controls.Add(Me._lblLogin_0)
    Me.picBG.Cursor = System.Windows.Forms.Cursors.Default
    Me.picBG.ForeColor = System.Drawing.SystemColors.WindowText
    Me.picBG.Location = New System.Drawing.Point(2, 9)
    Me.picBG.Name = "picBG"
    Me.picBG.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me.picBG.Size = New System.Drawing.Size(417, 95)
    Me.picBG.TabIndex = 5
    '
    '_lblLogin_3
    '
    Me._lblLogin_3.AutoSize = True
    Me._lblLogin_3.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_3.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_3.Font = New System.Drawing.Font("宋体", 14.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
    Me._lblLogin_3.ForeColor = System.Drawing.Color.White
    Me._lblLogin_3.Location = New System.Drawing.Point(50, 38)
    Me._lblLogin_3.Name = "_lblLogin_3"
    Me._lblLogin_3.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_3.Size = New System.Drawing.Size(252, 25)
    Me._lblLogin_3.TabIndex = 6
    Me._lblLogin_3.Text = "企业内部办公联系系统 V2.0"
    '
    '_lblLogin_1
    '
    Me._lblLogin_1.AutoSize = True
    Me._lblLogin_1.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_1.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_1.Font = New System.Drawing.Font("宋体", 10.5!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
    Me._lblLogin_1.ForeColor = System.Drawing.SystemColors.ControlText
    Me._lblLogin_1.Location = New System.Drawing.Point(14, 12)
    Me._lblLogin_1.Name = "_lblLogin_1"
    Me._lblLogin_1.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_1.Size = New System.Drawing.Size(63, 19)
    Me._lblLogin_1.TabIndex = 9
    Me._lblLogin_1.Text = "欢迎使用"
    '
    '_lblLogin_2
    '
    Me._lblLogin_2.AutoSize = True
    Me._lblLogin_2.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_2.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_2.ForeColor = System.Drawing.SystemColors.ControlText
    Me._lblLogin_2.Location = New System.Drawing.Point(167, 74)
    Me._lblLogin_2.Name = "_lblLogin_2"
    Me._lblLogin_2.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_2.Size = New System.Drawing.Size(208, 17)
    Me._lblLogin_2.TabIndex = 8
    Me._lblLogin_2.Text = "版权所有 (C) 2005-2008 特瑞飞软件"
    '
    '_lblLogin_0
    '
    Me._lblLogin_0.AutoSize = True
    Me._lblLogin_0.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_0.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_0.Font = New System.Drawing.Font("宋体", 14.25!, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, CType(134, Byte))
    Me._lblLogin_0.ForeColor = System.Drawing.Color.Black
    Me._lblLogin_0.Location = New System.Drawing.Point(52, 40)
    Me._lblLogin_0.Name = "_lblLogin_0"
    Me._lblLogin_0.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_0.Size = New System.Drawing.Size(203, 25)
    Me._lblLogin_0.TabIndex = 7
    Me._lblLogin_0.Text = "企业内部信息管理系统"
    '
    '_lblLogin_4
    '
    Me._lblLogin_4.AutoSize = True
    Me._lblLogin_4.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_4.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_4.ForeColor = System.Drawing.SystemColors.ControlText
    Me._lblLogin_4.Location = New System.Drawing.Point(64, 120)
    Me._lblLogin_4.Name = "_lblLogin_4"
    Me._lblLogin_4.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_4.Size = New System.Drawing.Size(42, 17)
    Me._lblLogin_4.TabIndex = 12
    Me._lblLogin_4.Text = "用户名"
    '
    '_lblLogin_5
    '
    Me._lblLogin_5.AutoSize = True
    Me._lblLogin_5.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_5.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_5.ForeColor = System.Drawing.SystemColors.ControlText
    Me._lblLogin_5.Location = New System.Drawing.Point(52, 152)
    Me._lblLogin_5.Name = "_lblLogin_5"
    Me._lblLogin_5.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_5.Size = New System.Drawing.Size(54, 17)
    Me._lblLogin_5.TabIndex = 11
    Me._lblLogin_5.Text = "登录密码"
    '
    'imgloginLogo
    '
    Me.imgloginLogo.Cursor = System.Windows.Forms.Cursors.Default
    Me.imgloginLogo.Image = CType(resources.GetObject("imgloginLogo.Image"), System.Drawing.Image)
    Me.imgloginLogo.Location = New System.Drawing.Point(320, 120)
    Me.imgloginLogo.Name = "imgloginLogo"
    Me.imgloginLogo.Size = New System.Drawing.Size(84, 93)
    Me.imgloginLogo.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage
    Me.imgloginLogo.TabIndex = 13
    Me.imgloginLogo.TabStop = False
    '
    '_lblLogin_6
    '
    Me._lblLogin_6.AutoSize = True
    Me._lblLogin_6.BackColor = System.Drawing.Color.Transparent
    Me._lblLogin_6.Cursor = System.Windows.Forms.Cursors.Default
    Me._lblLogin_6.ForeColor = System.Drawing.Color.FromArgb(CType(0, Byte), CType(0, Byte), CType(192, Byte))
    Me._lblLogin_6.Location = New System.Drawing.Point(72, 224)
    Me._lblLogin_6.Name = "_lblLogin_6"
    Me._lblLogin_6.RightToLeft = System.Windows.Forms.RightToLeft.No
    Me._lblLogin_6.Size = New System.Drawing.Size(227, 17)
    Me._lblLogin_6.TabIndex = 10
    Me._lblLogin_6.Text = "注：默认登录用户:密码 是 Admin:Admin"
    '
    'frmLogin
    '
    Me.AcceptButton = Me.cmdOK
    Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
    Me.CancelButton = Me.cmdExit
    Me.ClientSize = New System.Drawing.Size(421, 255)
    Me.Controls.Add(Me.fraLogin)
    Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedSingle
    Me.MaximizeBox = False
    Me.MinimizeBox = False
    Me.Name = "frmLogin"
    Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
    Me.Text = "登录"
    Me.fraLogin.ResumeLayout(False)
    Me.picBG.ResumeLayout(False)
    Me.ResumeLayout(False)

  End Sub

#End Region

  Private Sub frmLogin_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Load
    m_bLoginSuccess = False
    Me.Activate()
  End Sub

  Private Sub frmLogin_Closing(ByVal sender As Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles MyBase.Closing
    '用户非正常退出时才提示
    If Not m_bLoginSuccess Then
      If MsgBox("您确定要退出本系统吗？", MsgBoxStyle.Information + MsgBoxStyle.YesNo, "退出系统") = MsgBoxResult.Yes Then
        Application.Exit()
      Else
        e.Cancel = True   '取消卸载窗体
      End If
    End If
  End Sub

  '用户首次登录和重新登录
  Private Sub cmdOK_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdOK.Click
    Dim userObj As New InfoProSysBusiness.User
    Dim ErrMsg As String

    ErrMsg = userObj.Login(txtUser.Text, txtPwd.Text)
    If ErrMsg <> "" Then
      MsgBox(ErrMsg, MsgBoxStyle.Exclamation + MsgBoxStyle.OKOnly)
    Else
      '记录当前登录用户信息
      userObj.getUserInfo(txtUser.Text, LoginedUserInfo)
      m_bLoginSuccess = True
      Me.Close()
    End If

  End Sub

  Private Sub cmdExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdExit.Click
    Me.Close()
  End Sub
End Class