Basic socket Communication Flow

Server Common Model

1. Initialize the socket (for listening)

1) Initialization

SOCKET s;

s = Socket (...)

2) Binding

Bind (S, ... ）;

3) Monitoring

Listen (S, ... ）;

2. Establish a connection

1) Check the status

int ret = SELECT (...);

if (Ret > 0) {

New Connection

}

2) Establish a new connection (if a client requests a connection)

temp = accept (...); Note that you do not use the original socket at this time, but instead create a new socket (temp) to communicate with the client

3. Send and receive data

1) Detection of read-in data

int ret = SELECT (...)

if (Ret > 0) {

Have new data

}

2) Receive data

ret = recv (...);

3) Check sending data

int ret = SELECT (...);

4) Send data

ret = Send (...);

Client Common model

1. Initialization

1) Create socket

s = Socket (...)

2) Binding port

Bind (S, ...)   ; The client's IP address and port do not need to be fixed and can be automatically assigned by the system. So you can bind ports and protocols without using BIND.

2. Establish a connection

Connect (...)

3. Send and receive data

With the service side

4. Close the connection

From for notes (Wiz)

Basic socket Communication Flow