Basics of socket programming for Python programming

Python socket programming, first requires the import socket module

First create a Socket object

The first of these parameters is usually the following

1, socket.af_inet usually refers to the IP address, 2, Socket.af_unix usually refers to the local domain socket communication.

A second parameter

1, socket. Sock_stream stream Socket (TCP), 2, socket. Sock_dgram datagram Sockets (UDP)

Binding the specified IP and port

Sock.bind (address);

Parameters:

The socket created earlier uses the Af_inet type, where address is a two-element tuple.

Address is in the format (host,port) and host Ip,port is the port.

Like what:

Sock.bind (("172.25.81.16", 33306));

To set the size of the listening queue:

Sock.listen (backlog);

Parameters:

The backlog is used to set the size of the connection queue, with a minimum value of 1.

Like what:

Sock.listen (10);

Receive client connections:

Connect,address = Sock.accept ();

return value:

Connect is the connection established with the client, and subsequent communication relies on it to complete, buf=connect.recv (len) or Connect.send (BUF), and so on.

Address is the location information for the client, in the format (host,port)

Receiving and sending messages:

Receive:

BUF = connect.recv (len);

return value:

The content of the message received;

Receive length len;

For example:

BUF = CONNECT.RECV (1024);

Send:

buf= "Hello World";

Connect.send (BUF);

Link to server:

Sock.connect (address);

Parameters:

Address on the server side, in the format (HOST,IP).

For example:

Sock.connect ((192.168.1.1,8080));

To close the connection:

Sock.close ();

Basics of socket programming for Python programming