form1.vb

Visual Basic.NET精彩编程百例 第七章源码

Imports System
Imports System.Net
Imports System.Net.Sockets
Imports System.Text
Public Class Form1
    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 TextBox1 As System.Windows.Forms.TextBox
    Friend WithEvents Button1 As System.Windows.Forms.Button
    <System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
        Me.TextBox1 = New System.Windows.Forms.TextBox
        Me.Button1 = New System.Windows.Forms.Button
        Me.SuspendLayout()
        '
        'TextBox1
        '
        Me.TextBox1.AutoSize = False
        Me.TextBox1.Location = New System.Drawing.Point(16, 8)
        Me.TextBox1.Name = "TextBox1"
        Me.TextBox1.Size = New System.Drawing.Size(264, 168)
        Me.TextBox1.TabIndex = 0
        Me.TextBox1.Text = ""
        '
        'Button1
        '
        Me.Button1.Location = New System.Drawing.Point(104, 192)
        Me.Button1.Name = "Button1"
        Me.Button1.Size = New System.Drawing.Size(80, 32)
        Me.Button1.TabIndex = 1
        Me.Button1.Text = "发送广播"
        '
        'Form1
        '
        Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
        Me.ClientSize = New System.Drawing.Size(292, 238)
        Me.Controls.Add(Me.Button1)
        Me.Controls.Add(Me.TextBox1)
        Me.Name = "Form1"
        Me.Text = "发送广播"
        Me.ResumeLayout(False)

    End Sub

#End Region

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Dim MyIP As IPAddress
        Dim bytes(200) As Byte
        Dim Port1 As Integer = 8080
        Dim port2 As Integer = 3128
        MyIP = IPAddress.Parse("166.111.175.81")
        Dim myLocal As New IPEndPoint(MyIP, Port1)
        Dim myRemote As New IPEndPoint(MyIP, port2)
        Dim receive1 As New UdpClient(myRemote)
        Dim send1 As New UdpClient(myLocal)

        Try
            bytes = System.Text.Encoding.ASCII.GetBytes(TextBox1.Text.ToUpper)
            send1.Send(bytes, bytes.Length, myRemote)
            receive1.Receive(myLocal)
            MsgBox("发送成功！消息：" & vbCrLf & TextBox1.Text)
        Catch ex As Exception
            MsgBox("发送错误!")
        End Try
        send1.Close()
        receive1.Close()
    End Sub
End Class