正则表达式-如何告诉服务器忽略不需要的字符

Question

I need your help with my code. I'm building client + server which will execute my raspi camera MJPG-Stream.

import socket
import subprocess
import re

comms_socket = socket.socket()
comms_socket.bind(('', 4244))
comms_socket.listen(20)


reg_vyraz = "Start(\d+)x(\d+)x(\d+)"


try:
 while True:
    print("Waiting for connection... (Ctrl+C to exit)")
    connection, adress = comms_socket.accept()

    print("Connected")
    try:
        while True:
            received = connection.recv(4096).decode('UTF-8') 
            if (len(received) == 0):
                break;

            m = re.match(reg_vyraz, received)

            hodnoty = m.groups()

            for cislo in hodnoty: 
                    print (cislo)                   

            print ('Received ', hodnoty, ' from the client')

        sys.stdout.write("\n")
       except KeyboardInterrupt:
        print("Closing connection")
        connection.close()


except KeyboardInterrupt:
 print("Closing server")
 comms_socket.close()

What is it doing? When client sends to the server this: Start640x450x20, server will run the stream with: Width-640 Height-450 Fps-20

All I need is, to execute this only when I put this "Start640x450x20" into client, when I write something like "gfjlshgslsd" I need server to ignore it, not to turn down.

Thanks for help.

Answer 1

The entire code is correct. You have just missed 1 check.

Just check if m is None or not before calling m.groups()

if m:
    hodnoty = m.groups()
    for cislo in hodnoty: 
        print (cislo)