import subprocess
sub_obj = subprocess.Popen('ipconfig',  #系统指令shell=True,  #固定stdout=subprocess.PIPE, #标准输出  PIPE 管道,保存着指令的执行结果stderr=subprocess.PIPE )#标准错误输出a = sub_obj.stdout.read()  #执行"ipconfig"命令的结果,且a为字节类型
b = sub_obj.stderr.read()  #错误输出,但"ipconfig"命令可执行,所以b为空print('正确输出',a.decode('gbk'))  #因为操作系统的编码为"gbk",所以a字节应该用"gbk"来解码
print('错误输出',b.decode('gbk'))  #如果命令不可以被执行,b.decode('gbk')会打印 不是内部或外部命令...

import socket
import subprocess
server = socket.socket()
ip_port = ("127.0.0.1",8001)
server.bind(ip_port)
server.listen()
conn,add = server.accept()
while 1 :from_client = conn.recv(1024).decode("utf-8")print(from_client)sub_obj = subprocess.Popen(from_client,shell = True,stdout = subprocess.PIPE,stderr = subprocess.PIPE)std_msg = sub_obj.stdout.read()print("执行指令的长度:",len(std_msg))conn.send(std_msg)

import socketclient = socket.socket()
client.connect(('127.0.0.1',8001))while 1:cmd = input('请输入指令:')client.send(cmd.encode('utf-8'))server_cmd_result = client.recv(1024)print(server_cmd_result.decode('gbk'))

import socket
import subprocess
import struct
server = socket.socket()
ip_port = ("127.0.0.1",8003)
server.bind(ip_port)
server.listen()
conn,add = server.accept()
while 1 :# 收到客户端发来的消息,并进行解码from_client = conn.recv(1024).decode("utf-8")print(from_client)# 把收到的消息,放在"subprocess"模块中执行"Popen"方法(执行这条消息的指令)sub_obj = subprocess.Popen(from_client,shell = True,stdout = subprocess.PIPE,stderr = subprocess.PIPE)# 得到执行命令的结果,该结果为字节std_msg = sub_obj.stdout.read()#打印这个结果(字节)的长度print("执行指令的长度:",len(std_msg))# 把这个长度在"struct"模块中执行"pack"方法,"i"参数是把数字编译成4位字节(打包)dabao = struct.pack("i",len(std_msg))# 把执行指令的结果,前面加上这个结果的长度(4位字节),(把打包"dabao"嵌在真实结果的包头)发送到客户端conn.send(dabao+std_msg)

import socket
import struct
client = socket.socket()
client.connect(('127.0.0.1',8003))
while 1:cmd = input('请输入指令:')# 把输入的指令进行编码,传到服务端端client.send(cmd.encode('utf-8'))# 收到服务端发过来的消息(4个字节),其实就是服务端打包的执行命令的真实内容的长度.server_len_a = client.recv(4)# 在"struct"模块中执行"unpack"方法,把收到的4个字节解包# 取出该解包之后的元组中的索引为0的元素,该元素就是执行命令的(字节的)长度#  重点:解包出来的是元组,且只有一个元素server_len = struct.unpack('i',server_len_a)[0]# 再次收到服务端发过来的消息,"recv"后面的参数为执行命令的(字节的)长度server_msg = client.recv(server_len)# 因为操作系统编码为"gbk",所以执行命令的(字节类型)解码为"gbk"print(server_msg.decode('gbk'))