Python使用Socket的UDP通信，检查收到的数据

Question

我对Python很陌生，试图编写一个代码来接收来自UDP连接的字符串，现在的问题是我需要从2个源接收数据，我如果没有来自其中一方或两方的数据，程序将继续循环，但现在如果没有来自源2的数据，它将停在那里等待数据，如何解决它？ 我正在考虑使用if语句，但我不知道如何检查传入数据是否为空，任何想法将不胜感激！

import socket 

UDP_IP1 = socket.gethostname() 
UDP_PORT1 = 48901 
UDP_IP2 = socket.gethostname() 
UDP_PORT2 = 48902 

sock1 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
sock1.bind((UDP_IP1, UDP_PORT1)) 
sock2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
sock2.bind((UDP_IP2, UDP_PORT2)) 

while True: 
    if sock1.recv != None: 
     data1, addr = sock1.recvfrom(1024) 
     data1_int = int(data1) 
     print "SensorTag[1] RSSI:", data1_int 

    if sock2.recv != None: 
     data2, addr = sock2.recvfrom(1024) 
     data2_int = int(data2) 
     print "SensorTag[2] RSSI:", data2_int 

Answer 1

如果select不适合你，你可以随时把它们扔进一个线程。你只需要小心共享数据并在他们周围放置好的互斥体。请参阅threading.Lock寻求帮助。

import socket 
import threading 
import time 

UDP_IP1 = socket.gethostname() 
UDP_PORT1 = 48901 
UDP_IP2 = socket.gethostname() 
UDP_PORT2 = 48902 

sock1 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
sock1.bind((UDP_IP1, UDP_PORT1)) 
sock2 = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) 
sock2.bind((UDP_IP2, UDP_PORT2)) 

def monitor_socket(name, sock): 
    while True: 
     sock.recv != None: 
      data, addr = sock.recvfrom(1024) 
      data_int = int(data) 
      print name, data_int 

t1 = threading.Thread(target=monitor_socket, args=["SensorTag[1] RSSI:", sock1]) 
t1.daemon = True 
t1.start() 

t2 = threading.Thread(target=monitor_socket, args=["SensorTag[2] RSSI:", sock2]) 
t2.daemon = True 
t2.start() 

while True: 
    # We don't want to while 1 the entire time we're waiting on other threads 
    time.sleep(1) 

注意这并不是由于没有运行两个UPD源进行测试。