C#socket通信

2021-07-14 21:16

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关于C#socket通信,分为同步和异步通信,本文简单介绍一下同步通信。

通信两端分别为客户端(Client)和服务器(Server):

(1)Cient:

1:建立一个Socket对像;

2:用socket对像的Connect()方法以上面建立的EndPoint对像做为参数,向服务器发出连接请求;

3:如果连接成功,就用socket对像的Send()方法向服务器发送信息;

4:用socket对像的Receive()方法接受服务器发来的信息 ;

5:通信结束后一定记得关闭socket;

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Net;
 
namespace Client
{
    class Program
    {
       static Socket ClientSocket;
        static void Main(string[] args)
        {
            String IP = "127.0.0.1";
            int port =8885 ;
 
            IPAddress ip = IPAddress.Parse(IP);  //将IP地址字符串转换成IPAddress实例
            ClientSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);//使用指定的地址簇协议、套接字类型和通信协议
            IPEndPoint endPoint = new IPEndPoint(ip, port); // 用指定的ip和端口号初始化IPEndPoint实例
            ClientSocket.Connect(endPoint);  //与远程主机建立连接
 
 
            Console.WriteLine("开始发送消息");
            byte[] message = Encoding.ASCII.GetBytes("Connect the Server");  //通信时实际发送的是字节数组,所以要将发送消息转换字节
            ClientSocket.Send(message);
            Console.WriteLine("发送消息为:" + Encoding.ASCII.GetString(message));
            byte[] receive = new byte[1024];
            int length = ClientSocket.Receive(receive);  // length 接收字节数组长度
            Console.WriteLine("接收消息为:" + Encoding.ASCII.GetString(receive));
            ClientSocket.Close();  //关闭连接
        }
    }
}

  

客户端返回结果:

技术分享图片

(2)Server: 

1:建立一个Socket对像;

2:用socket对像的Bind()方法绑定EndPoint;

3:用socket对像的Listen()方法开始监听;

4:接受到客户端的连接,用socket对像的Accept()方法创建新的socket对像用于和请求的客户端进行通信;

5:用新的socket对象接收(Receive)和发送(Send)消息。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Net;
using System.Threading;
 
namespace Server
{
    class Program
    {
        static Socket ReceiveSocket;
        static void Main(string[] args)
        {
            int port = 8885;
            IPAddress ip = IPAddress.Any;  // 侦听所有网络客户接口的客活动
            ReceiveSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);//使用指定的地址簇协议、套接字类型和通信协议   
ReceiveSocket.SetSocketOption(SocketOptionLevel.Socket,SocketOptionName.ReuseAddress,true); //有关套接字设置 IPEndPoint endPoint = new IPEndPoint(ip,port); ReceiveSocket.Bind(new IPEndPoint(ip, port)); //绑定IP地址和端口号 ReceiveSocket.Listen(10); //设定最多有10个排队连接请求 Console.WriteLine("建立连接"); Socket socket = ReceiveSocket.Accept(); byte[] receive = new byte[1024]; socket.Receive(receive); Console.WriteLine("接收到消息:" + Encoding.ASCII.GetString(receive)); byte[] send = Encoding.ASCII.GetBytes("Success receive the message,send the back the message"); socket.Send(send); Console.WriteLine("发送消息为:"+Encoding.ASCII.GetString(send)); } } }

  

服务器返回结果:

技术分享图片


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