求高手帮我看下这个错误该怎么改
在下面红字部分显示的错误是：未处理 System.NullReferenceExceptionMessage=未将对象引用设置到对象的实例。
Source=掷易做图客户端
StackTrace:
在 掷易做图客户端.Form1.ListenMsg() 位置 E:\以前\掷易做图31\掷易做图31\掷易做图客户端\Form1.cs:行号 63
在 System.Threading.ThreadHelper.ThreadStart_Context(Object state)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
在 System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
在 System.Threading.ThreadHelper.ThreadStart()
InnerException:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
//add
using System.Net;
using System.Net.Sockets;
using System.Threading;
namespace 掷易做图客户端
{
public delegate void NewForm(string ip);
public partial class Form1 : Form
{
Communication communicate=new Communication();
ProgressBar pro = new ProgressBar();//状态条
/// <summary>
/// 判断是否连接上
/// </summary>
bool connected;
public Form1()
{
InitializeComponent();
}
#region 进行连接
private void button1_Click(object sender, EventArgs e)
{
if (this.textBox1.Text == "")
{
MessageBox.Show("昵称不能为空");
return;
}
//实现进度条
pro.Location = new Point(42,161);
pro.Size = new Size(181,27);
pro.Style = ProgressBarStyle.Marquee;
this.Controls.Add(pro);
//进行连接
if(!this.textBox2.Visible)
communicate.SendMsg("join|"+this.textBox1.Text+"|"+communicate.MyIp,"192.168.255.255",1500);
else if (CheckIP())
{
communicate.SendMsg("join|" + this.textBox1.Text + "|" + communicate.MyIp, this.textBox2.Text, 1500);
pro.Visible = true;
}
else
{
MessageBox.Show("IP格式不正确");
return;
}
Thread fail = new Thread(new ThreadStart(ConnectedCheck));
fail.Start();
}
#endregion
#region 监听服务器信息
private void ListenMsg()
{
////本指定端口
UdpClient udpclient = new UdpClient(3000);
IPEndPoint remote=null ;
MessageBox.Show(remote.Address.ToString()+"1");
while (true)
{
try
{
byte[] bytes = udpclient.Receive(ref remote);
MessageBox.Show(remote.Address.ToString() + "1");
string recieve = Encoding.UTF8.GetString(bytes, 0, bytes.Length);
string[] message = recieve.Split('|');
if (message[0] == "connect")
{
if (communicate.MyIp != message[3]) continue;
if (message[2]== "1")
{
this.Invoke(new NewForm(ProductForm), message[1]);
udpclient.Close();
break;
}
else
{
connected = true;
MessageBox.Show("已经存在同样的名字");
}
}
}
catch
{
}
}
}
#endregion
#region 检查是否已经连接上
private void ConnectedCheck()
{
Thread.Sleep(8000);
if (!connected)
{
this.Invoke(new MethodInvoker(SerachFail));
}
}
#endregion
#region 未连接上时所采取的反应
private void SerachFail()
{
DialogResult d;
d = MessageBox.Show("本网络不存在服务器，是否需要跨网络搜索？", "猜易做图", MessageBoxButtons.YesNoCancel, MessageBoxIcon.Exclamation);
if (d == DialogResult.Yes)
{
label4.Visible = true;
this.textBox2.Visible = true;
}
pro.Visible = false;
return;
}
#endregion
#region 检查IP
private bool CheckIP()
{
try
{
string[] bIP = this.textBox2.Text.Split('.');
for (int i = 0; i < 4; i++)
{
int a = Int32.Parse(bIP[i]);
if (a < 0 || a > 255)
return false;
}
return true;
}
catch
{
return false;
}
}
#endregion
#region 创建子窗体
private void ProductForm(string ip)
{
connected=true;
this.Hide();
HouseForm house=new HouseForm(ip,this.textBox1.Text);
house.Show(this);
}
#endregion
private void Form1_Load(object sender, EventArgs e)
{
Thread mythread = new Thread(new ThreadStart(ListenMsg));
//将线程设为后台运行
mythread.IsBackground = true;
mythread.Start();
}
}
}
--------------------编程问答-------------------- remote=null;
错误很明显没有实例化 --------------------编程问答--------------------
我刚学不久，这个应该怎么改呢？谢谢
--------------------编程问答--------------------
IPEndPoint remote = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 80);//两个参数，一个为IP地址，一个为端口号
--------------------编程问答--------------------
这一行抛出异常的时候，vs会进入调试器，你此时调试了吗？如果调试了，你贴出来 remote.Address 是什么值。
补充：.NET技术 , C#
