vb.net 怎样用UDP 协议 写一个聊天程序啊？如图

'xiansr.2014/2/7 vb.net2010 调试通过

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Imports System.Net

Imports System.Net.Sockets

Imports System.Text

Public Class Form1

Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click

Dim udpClient As New UdpClient(11000)

Try

udpClient.Connect("127.0.0.1", 11000)

Dim sendBytes As [Byte]() = Encoding.ASCII.GetBytes(RichTextBox1.Text)

udpClient.Send(sendBytes, sendBytes.Length)

Dim RemoteIpEndPoint As New IPEndPoint(IPAddress.Any, 0)

Dim receiveBytes As [Byte]() = udpClient.Receive(RemoteIpEndPoint)

Dim returnData As String = Encoding.ASCII.GetString(receiveBytes)

RichTextBox2.Text = "接收到： " + returnData.ToString()

'Debug.Print(("This message was sent from " + RemoteIpEndPoint.Address.ToString() + " on their port number " + RemoteIpEndPoint.Port.ToString()))

udpClient.Close()

Catch ex As Exception

stop

End Try

End Sub

End Class

vb.net问题

你是在哪一句出错？

错误“未将对象引用设置到对象的实例。”一般都是一些Object类型的变量没有初始化（New）导致的

vb.net编写的聊天程序怎么不能传送汉字

‘客户端向这样写：在窗体说放两个文本框、两个标签、两个按钮、一个列表框

Imports System.Net

Imports System.Net.Sockets

Imports System.IO

Imports System.Threading

Public Class Form1

'网络基础数据流

Private ns As NetworkStream

Private swriter As StreamWriter

Private nsread As StreamReader

Private tcpclient As TcpClient

Private tcpconnected As Boolean = False

Private clisocket As Socket

Private mythread As Thread

'发送

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

If Me.TextBox2.Text "" Then

swriter.WriteLine(Me.TextBox2.Text)

swriter.Flush()

Me.TextBox2.Text = ""

Else

MessageBox.Show("发送信息不能为空！", "错误提示")

End If

End Sub

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

'建立连连接

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

Dim ipremote As IPAddress

Dim tcpclient As TcpClient

Try

ipremote = IPAddress.Parse(Me.TextBox1.Text)

Catch ex As Exception

MessageBox.Show("IP地址不合法！", "错误提示")

End Try

Try

tcpclient = New TcpClient(Me.TextBox1.Text, 8000)

ns = tcpclient.GetStream

swriter = New StreamWriter(ns)

Me.StatusBar1.Text = "已经连接上"

Me.Button2.Enabled = False

Me.Button1.Enabled = True

tcpconnected = True

Catch ex As Exception

MessageBox.Show("无法与远程8000端口建立连接！", "错误提示")

End Try

End Sub

Private Sub listen()

Try

Dim tcplistener As New TcpListener(IPAddress.Parse("127.0.0.1"), 8000)

tcplistener.Start()

tcpclient = tcplistener.AcceptTcpClient

ns = tcpclient.GetStream()

nsread = New StreamReader(ns)

While True

Dim msg As String = nsread.ReadLine

If msg = "stop" Then

tcplistener.Stop()

ns.Close()

nsread.Close()

mythread.Abort()

Else

Dim mytime As String = DateTime.Now.ToShortTimeString

Me.ListBox1.Items.Add(mytime + " " + msg)

End If

End While

Catch ex As System.Security.SecurityException

MessageBox.Show("侦听失败！", "错误")

End Try

End Sub

End Class

VB.NET中能否做一个像QQ那样的聊天框，可以输入文字和图片？

第一个问题 qq聊天室 必须能 用vb都可以做

第二个问题 vb.net插入数学公式 可以把这些公式封装到一个类中，调用就是了