IOS Socket 02-socket Basics

1. Introduction

A socket is a mechanism for network services

Both ends of the communication are sockets

Network communication is actually the communication between sockets

Data is transmitted via IO between two sockets

2. Socket Communication flowchart

3. Simulated QQ Chat Map

First of all, Zhang San QQ first issued a word ' Have you eaten? ' to server servers. After the server receives the message, send it to John Doe.

Then, John Doe received this sentence, make the corresponding reply ' not yet, together eat not ' to Zhang San QQ. This sentence return operation is the same process, first sent to the server, and finally sent to Zhang San QQ. Such as:

Before reading this article, you can learn the basics of networking:

IOS Socket 01-Network Protocol Basics

IOS Socket 02-socket Basics