Send  Receive方式

概述

为了和某一个远程主机通讯，在创建套接字后，使用Connect方法先和远程主机建立连接，然后直接用Send方法和Receive方法发送和接收数据。

发送端示例

using System;
using System.Collections.Generic;
using System.Text;

using System.Net;
using System.Net.Sockets;

namespace SendExamples
{
    /// <summary>
    /// 发送数据
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            string HostIP = System.Configuration.ConfigurationManager.AppSettings["HostIP"];
            int Port = Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["Port"]);

            while (true)
            {
                Console.Write("输入发送的信息（bye退出)：");
                str = Console.ReadLine();
                //字符串转换为字节数组
                bytes = System.Text.Encoding.Unicode.GetBytes(str);
                //向远程终端发送信息
                socket.Send(bytes);

                if (str == "bye") break;
            }

            socket.Close();
        }
    }
}

接收端示例

using System;
using System.Collections.Generic;
using System.Text;

using System.Net;
using System.Net.Sockets;

namespace SendExamples
{
    /// <summary>
    /// 接收数据
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            int Port = Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["Port"]);

            int length;
            byte[] bytes = new byte[32768];
            string str = string.Empty;

            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
            //参数1指定本机IP地址（此处指所有可用的IP地址），参数2指定接收用的端口
            IPEndPoint myHost = new IPEndPoint(IPAddress.Any, Port);
            //将本机IP地址和端口与套接字绑定，为接收做准备
            socket.Bind(myHost);

            while (true)
            {
                Console.WriteLine("等待接收...");
                //从本地绑定的IP地址和端口接收远程终端的数据，返回接收的字节数
                length = socket.Receive(bytes);
                //字节数组转换为字符串
                str = System.Text.Encoding.Unicode.GetString(bytes, 0, length);
                if (str == "bye") break;
                Console.WriteLine("接收到信息：{0}", str);
            }

            socket.Close();
        }
    }
}

SendTo  ReceiveFrom方式

概述

SendTo和ReceiveFrom方法传送数据时，需要在参数中指定远程主机，这种方法适用于向多个远程主机发送数据的场合。比如动态生成远程主机的IP地址，达到向不同主机发送相同数据的目的。

发送端示例

 using System;
using System.Collections.Generic;
using System.Text;

using System.Net;
using System.Net.Sockets;

namespace SendToExamples
{
    /// <summary>
    /// 发送数据
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            string HostIP = System.Configuration.ConfigurationManager.AppSettings["HostIP"];
            int Port = Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["Port"]);

            string str = string.Empty;
            byte[] bytes = new byte[32768];
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            //定义远程IP地址和端口（实际使用时就为远程主机IP地址，为发送数据做准备
            IPEndPoint remote = new IPEndPoint(IPAddress.Parse(HostIP), Port);
            //从IPEndPoint得到EndPoint类型
            EndPoint remoteHost = (EndPoint)remote;

            while (true)
            {
                Console.Write("输入发送的信息：（bye退出）");
                str = Console.ReadLine();
                bytes = System.Text.Encoding.Unicode.GetBytes(str);
                socket.SendTo(bytes, remoteHost);
                if (str == "bye") break;
            }

            socket.Close();
        }
    }
}

接收端示例

 using System;
using System.Collections.Generic;
using System.Text;

using System.Net;
using System.Net.Sockets;

namespace ReceiveFromExamples
{
    /// <summary>
    /// 接收数据
    /// </summary>
    class Program
    {
        static void Main(string[] args)
        {
            int Port = Convert.ToInt32(System.Configuration.ConfigurationManager.AppSettings["Port"]);

            string str = string.Empty;
            int length;
            byte[] bytes = new byte[32768];
            Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);

            //参数1指定本机IP地址（此处指所有可用的IP地址），参数2指定接收用的端口
            IPEndPoint myHost = new IPEndPoint(IPAddress.Any, Port);
            //将本机IP地址和端口与套接字绑定，为接收做准备
            socket.Bind(myHost);
            //从IPEndPoint得到EndPoint类型
            EndPoint remoteHost = (EndPoint)myHost;

            while (true)
            {
                Console.WriteLine("等待接收...");
                //从本地绑定的IP地址和端口接收远程终端的数据，返回接收的字节数
                length = socket.ReceiveFrom(bytes, ref remoteHost);
                //字节数组转换为字符串
                str = System.Text.Encoding.Unicode.GetString(bytes, 0, length);
                if (str == "bye") break;
                Console.WriteLine("接收到信息：{0}", str);
            }

            socket.Close();
        }
    }
}