Python socket编程之二：【struct.pack】&【struct.unpack】

import struct
"""通过 socket 的 send 和 recv 只能传输 str 格式的数据"""
"""struct.pack"""
a1 = 10
a2 = 100
str = struct.pack("ii", a1, a2)
print('str = ', str)
"""struct.unpack"""
a1, a2 = struct.unpack("ii", str)
print('a1 = ', a1)
print('a2 = ', a2)

args = ("H", "ello world ", 5)
struct.pack("c12si", *args)
# 等价于
struct.pack("c12si", "H", "ello world ", 5)

一个完整的实例

• 1.f1.py

# -*- coding: utf-8 -*-
"""f1.py"""
"""Python socket 编程实例"""
import socket
import struct
########################################################################
class sckt:
    """变量名缩写法，sckt 代表 socket"""
    #----------------------------------------------------------------------
    def __init__(self, host = '192.168.1.3', port = 12345):
        """地址与端口初始化"""
        self.host = host
        self.port = port
    #----------------------------------------------------------------------
    def run_server(self):
        """服务器"""
        sckt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        """声明 TCP/IP 报文"""
        sckt.bind((self.host, self.port))
        """绑定地址与端口"""
        sckt.listen(5)
        """启动监听"""
        connection, address = sckt.accept()
        """开启接收"""
        if connection.recv(1024) == b'Link':
            """对接信号，b'' 代表二进制形式的字符串，socket 的要求"""
            print('Linking server successed!')     
            ld = [1, 2, 3]
            """Listdata，数据格式 3i = [int，int，int]"""
            sd = struct.pack('3i', ld[0], ld[1], ld[2])
            """根据 ld 数据格式 pack 为 socket 传输格式 3i"""
            connection.send(sd)
            """向客户端发送数据"""            
        else:
            connection.send(b'Cut off the connection!')
            connection.close()
            """关闭链接"""
    #----------------------------------------------------------------------
    def run_client(self, message = b'Link'):
        """客户端"""
        sckt = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        """声明 TCP/IP 报文"""
        sckt.connect((self.host, self.port))
        """链接服务器"""
        sckt.send(message)
        """向服务器发送数据"""
        sd = sckt.recv(1024)
        """接收服务器数据"""
        ld = struct.unpack('3i', sd)
        """解包"""
        print(ld)
        sckt.close()
        """关闭连接"""

• 2.f2.py

# -*- coding: utf-8 -*-
"""f2.py"""
"""载入模块"""
import sys
sys.path.append('D:/360data/重要数据/桌面')
import f1
"""地址初始化"""
F1 = f1.sckt()
"""运行服务器"""
F1.run_server()
"""运行客户端"""
F1.run_client()