C#socket Communication

About C#socket communication, which is divided into synchronous and asynchronous communication, this paper briefly introduces the synchronous communication.

The two ends of the communication are client and server, respectively:

(1) Cient:

1: Create a socket pair image;

2: Connect () using the socket to the image of the endpoint as a parameter, to the server to make a connection request;

3: If the connection is successful, send a message to the server using the Send () method of the socket for the image;

4: Accept the message sent by the server using the receive () method of the socket image;

5: Remember to close the socket after the communication is over;

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); Converts an IP address string into a ipaddress instance clientsocket = new Socket (addressfamily.internetwork,sockettype.stream,protocoltype.tc p);//Use the specified address cluster protocol, socket type, and communication protocol IPEndPoint EndPoint = new IPEndPoint (IP, port);  Initializes the IPEndPoint instance Clientsocket.connect (endPoint) with the specified IP and port number;            Establish a connection with the remote host Console.WriteLine ("Start sending message");  byte[] message = Encoding.ASCII.GetBytes ("Connect the Server");            A byte array is actually sent when communicating, so the sending message is converted to byte clientsocket.send (message);            Console.WriteLine ("Send message:" + Encoding.ASCII.GetString (message));            Byte[] receive = new byte[1024]; int LEngth = Clientsocket.receive (Receive);            The length of the received byte array is Console.WriteLine ("Receive message:" + Encoding.ASCII.GetString (receive));  Clientsocket.close (); Close Connection}}}

The client returns the result:

(2) Server:

1: Create a socket pair image;

2: Bind the endpoint with the bind () method of the socket to the image;

3: Use the socket to the image of the Listen () method to start monitoring;

4: Accept the connection to the client, and use the socket to create a new socket for the image to communicate with the client such as the request;

5: Receives (receive) and sends (send) messages with the new socket object.

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 SOC        Ket Receivesocket;            static void Main (string[] args) {int port = 8885;  IPAddress IP = ipaddress.any; Guest activity for listening on all network client interfaces Receivesocket = new Socket (AddressFamily.InterNetwork, SocketType.Stream, protocoltype.tcp); /using the specified address cluster protocol, socket type, and communication protocol
Receivesocket.setsocketoption (socketoptionlevel.socket,socketoptionname.reuseaddress,true);            About socket settings IPEndPoint endPoint = new IPEndPoint (ip,port); Receivesocket.bind (New IPEndPoint (IP, port));  Bind IP address and port number Receivesocket.listen (10);            Set up to 10 queued connection requests Console.WriteLine ("Establish connection");                     Socket socket = receivesocket.accept ();             Byte[] receive = new byte[1024]; Socket.            Receive (receive);            Console.WriteLine ("Received message:" + Encoding.ASCII.GetString (receive));            byte[] Send = Encoding.ASCII.GetBytes ("Success receive the Message,send the back of the message"); Socket.            Send (send);        Console.WriteLine ("Send Message:" +encoding.ascii.getstring (send)); }      }}

The server returns the result:

　

C#socket Communication