如何从客户端向服务器套接字发送消息

Question

hi i am trying to detect if usb connect to client side. what my logic is that to get the total number of disks if new disk added means new devices is added on client if usb remove from client means devices is remove from client so i keep checking in loop the client show total = 1 or total = 2 , 1 means only 1 disk is available 2 means new device is added and so on. It working fine but the sock.send("Device Added in " + username) sock.send("Device remove in " + username) these command not working i dont get these message on server side if i plug or plug out the usb from client side. i am not sure if my if else conditions are correct or not.

os linux

this is client side code

from socket import *
import os, string, time
import getpass

host = 'localhost'  
port = 52000
username = getpass.getuser()

sock = socket()
# Connecting to socket
sock.connect((host, port))  # Connect takes tuple of host and port

def detect_device(previous):
    
    total = os.system(' lsblk | grep disk | wc -l')
    time.sleep(3)
# if conditon if new device add
    if total<previous:
     sock.send("Device Added in " + username)
# if no new device add or remove
    elif total==previous:
     detect_device(previous)
# if device remove
    else:
     sock.send("Device Removed in " + username)
# Infinite loop to keep client running.
while True:
    data = sock.recv(1024)
    if (data == 'Hi'):
        while True:
            detect_device(os.system(' lsblk | grep disk | wc -l'))

sock.close()

output i get on client side is 1 1 1 2 2 2 2 1 1

1 means current number of total disks are 1 if i plug usb then total number of disks is 2 then 1 means i disconnect USB

Answer 1

好的，我修复了 os.system 在输出中返回 0，所以我用 subprocess.run 尝试它，它运行良好。