login.vb

档案管理系统

Public Class frmLogin
    Inherits System.Windows.Forms.Form

#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。
    Friend WithEvents btnLogin As System.Windows.Forms.Button
    Friend WithEvents btnCancel As System.Windows.Forms.Button
    Friend WithEvents btnDefault As System.Windows.Forms.Button
    Friend WithEvents GroupBox1 As System.Windows.Forms.GroupBox
    Friend WithEvents txtUsername As System.Windows.Forms.TextBox
    Friend WithEvents Label1 As System.Windows.Forms.Label
    Friend WithEvents txtPassword As System.Windows.Forms.TextBox
    Friend WithEvents Label2 As System.Windows.Forms.Label
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.btnLogin = New System.Windows.Forms.Button
        Me.btnCancel = New System.Windows.Forms.Button
        Me.btnDefault = New System.Windows.Forms.Button
        Me.GroupBox1 = New System.Windows.Forms.GroupBox
        Me.txtUsername = New System.Windows.Forms.TextBox
        Me.Label1 = New System.Windows.Forms.Label
        Me.txtPassword = New System.Windows.Forms.TextBox
        Me.Label2 = New System.Windows.Forms.Label
        Me.GroupBox1.SuspendLayout()
        Me.SuspendLayout()
        '
        'btnLogin
        '
        Me.btnLogin.Location = New System.Drawing.Point(16, 112)
        Me.btnLogin.Name = "btnLogin"
        Me.btnLogin.Size = New System.Drawing.Size(48, 23)
        Me.btnLogin.TabIndex = 1
        Me.btnLogin.Text = "登录"
        '
        'btnCancel
        '
        Me.btnCancel.DialogResult = System.Windows.Forms.DialogResult.Cancel
        Me.btnCancel.Location = New System.Drawing.Point(88, 112)
        Me.btnCancel.Name = "btnCancel"
        Me.btnCancel.Size = New System.Drawing.Size(48, 23)
        Me.btnCancel.TabIndex = 2
        Me.btnCancel.Text = "取消"
        '
        'btnDefault
        '
        Me.btnDefault.DialogResult = System.Windows.Forms.DialogResult.OK
        Me.btnDefault.Location = New System.Drawing.Point(88, 112)
        Me.btnDefault.Name = "btnDefault"
        Me.btnDefault.Size = New System.Drawing.Size(48, 23)
        Me.btnDefault.TabIndex = 1
        '
        'GroupBox1
        '
        Me.GroupBox1.Controls.Add(Me.txtUsername)
        Me.GroupBox1.Controls.Add(Me.Label1)
        Me.GroupBox1.Controls.Add(Me.txtPassword)
        Me.GroupBox1.Controls.Add(Me.Label2)
        Me.GroupBox1.Location = New System.Drawing.Point(16, 8)
        Me.GroupBox1.Name = "GroupBox1"
        Me.GroupBox1.Size = New System.Drawing.Size(192, 96)
        Me.GroupBox1.TabIndex = 0
        Me.GroupBox1.TabStop = False
        Me.GroupBox1.Text = "登录信息"
        '
        'txtUsername
        '
        Me.txtUsername.Location = New System.Drawing.Point(72, 24)
        Me.txtUsername.Name = "txtUsername"
        Me.txtUsername.TabIndex = 0
        Me.txtUsername.Text = ""
        '
        'Label1
        '
        Me.Label1.Location = New System.Drawing.Point(8, 24)
        Me.Label1.Name = "Label1"
        Me.Label1.Size = New System.Drawing.Size(48, 23)
        Me.Label1.TabIndex = 4
        Me.Label1.Text = "用户名"
        Me.Label1.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'txtPassword
        '
        Me.txtPassword.Location = New System.Drawing.Point(72, 64)
        Me.txtPassword.Name = "txtPassword"
        Me.txtPassword.TabIndex = 1
        Me.txtPassword.Text = ""
        '
        'Label2
        '
        Me.Label2.Location = New System.Drawing.Point(16, 64)
        Me.Label2.Name = "Label2"
        Me.Label2.Size = New System.Drawing.Size(40, 23)
        Me.Label2.TabIndex = 3
        Me.Label2.Text = "密码"
        Me.Label2.TextAlign = System.Drawing.ContentAlignment.MiddleRight
        '
        'frmLogin
        '
        Me.AcceptButton = Me.btnLogin
        Me.AutoScaleBaseSize = New System.Drawing.Size(6, 14)
        Me.CancelButton = Me.btnCancel
        Me.ClientSize = New System.Drawing.Size(224, 149)
        Me.Controls.Add(Me.GroupBox1)
        Me.Controls.Add(Me.btnLogin)
        Me.Controls.Add(Me.btnCancel)
        Me.Controls.Add(Me.btnDefault)
        Me.MaximizeBox = False
        Me.Name = "frmLogin"
        Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
        Me.Text = "用户登录"
        Me.GroupBox1.ResumeLayout(False)
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private DataReader As System.Data.OleDb.OleDbDataReader

    Private Sub btnLogin_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnLogin.Click
        If OleConn.SelectQuery("select * from 用户信息 where 用户名='" & txtUsername.Text & "'", DataReader) Then
            If DataReader.Read Then
                If Trim(DataReader.Item("用户密码")) = txtPassword.Text Then
                    btnDefault.PerformClick()
                Else
                    MsgBox("密码错误")
                    txtPassword.Focus()
                End If
            Else
                MsgBox("不存在此用户")
                txtUsername.Text = ""
                txtPassword.Text = ""
            End If

            DataReader.Close()
        Else
            MsgBox("验证用户信息失败")
        End If
    End Sub
End Class