UDPClient的用法代码,CSharp代码库,德仔网

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【CSharp】 UDPClient的用法
作者:Dezai.CN / 发布于2013/1/4/ 446
using System;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;
using System.Threading;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        //接收用        
        private UdpClient receiveUdpClient;
        //发送用
        private UdpClient sendUpdClient;
        //和本机绑定的端口号
        private const int port = 18001;
        //本机IP
        private IPAddress ip;
        //远程主机
        private IPAddress remoteIp;
        public Form1()
        {
            InitializeComponent();
            //获取本机可用IP地址
            IPAddress[] ips = Dns.GetHostAddresses(Dns.GetHostName());
            ip = ips[ips.Length-1];
            //为了在同一台机器上测试，此IP也作为默认远程IP
            //remoteIp = IPAddress.Parse("90.0.0.192");
            //textBoxRemoteIP.Text = remoteIp.ToString();
            textBoxMessage.Text = "hello";
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            //创建一个线程接收远程主机发来的信息
            Thread myThread = new Thread(ReceiveData);
            //将线程设为后台运行
            myThread.IsBackground = true;
            myThread.Start();
            textBoxMessage.Focus();
        }
        private void ReceiveData()
        {
            IPEndPoint local = new IPEndPoint(ip, port);
            receiveUdpClient = new UdpClient(local);
            IPEndPoint remote = new IPEndPoint(IPAddress.Any, 0);
            while (true)
            {
                try
                {
                    byte[] receiveBytes = receiveUdpClient.Receive(ref remote);
                    string receiveMessage = Encoding.Unicode.GetString(receiveBytes);
                    AddItem(listBoxReceive, string.Format("来自{0}：{1}", remote, receiveMessage));
                }
                catch
                {
                    break;
                }
            }
        }
        private void buttonSend_Click(object sender, EventArgs e)
        {
            remoteIp = IPAddress.Parse(textBoxRemoteIP.Text);
            Thread t = new Thread(SendMessage);
            t.IsBackground = true;
            t.Start(textBoxMessage.Text);
        }
        private void SendMessage(object obj)
        {
            string message = (string)obj;
            sendUpdClient = new UdpClient(0);
            byte[] bytes = System.Text.Encoding.Unicode.GetBytes(message);
            IPEndPoint iep = new IPEndPoint(remoteIp, port);
            try
            {
                sendUpdClient.Send(bytes, bytes.Length, iep);
                AddItem(listBoxState,string.Format("向{0}发送：{1}",iep,message));
                ClearTextBox();
            }
            catch (Exception ex)
            {
                AddItem(listBoxState, "发送出错：" + ex.Message);
            }
        }
        delegate void AddListBoxItemDelegate(ListBox listbox, string text);
        private void AddItem(ListBox listbox, string text)
        {
            if (listbox.InvokeRequired)
            {
                AddListBoxItemDelegate d = AddItem;
                listbox.Invoke(d, new object[] { listbox, text });
            }
            else
            {
                listbox.Items.Add(text);
                listbox.SelectedIndex = listbox.Items.Count - 1;
                listbox.ClearSelected();
            }
        }
        delegate void ClearTextBoxDelegate();
        private void ClearTextBox()
        {
            if (textBoxMessage.InvokeRequired)
            {
                ClearTextBoxDelegate d = ClearTextBox;
                textBoxMessage.Invoke(d);
            }
            else
            {
                textBoxMessage.Clear();
                textBoxMessage.Focus();
            }
        }
    }
}
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　UDPClient　
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