在本地網絡上執行服務通告/發現的一個簡單方法是廣播UDP包。

常數：PORT = 50000

MAGIC = "fna349fn" #to make sure we don't confuse or get confused by other programs

公告：from time import sleep

from socket import socket, AF_INET, SOCK_DGRAM, SOL_SOCKET, SO_BROADCAST, gethostbyname, gethostname

s = socket(AF_INET, SOCK_DGRAM) #create UDP socket

s.bind(('', 0))

s.setsockopt(SOL_SOCKET, SO_BROADCAST, 1) #this is a broadcast socket

my_ip= gethostbyname(gethostname()) #get our IP. Be careful if you have multiple network interfaces or IPs

while 1:

data = MAGIC+my_ip

s.sendto(data, ('', PORT))

print "sent service announcement"

sleep(5)

發現：from socket import socket, AF_INET, SOCK_DGRAM

s = socket(AF_INET, SOCK_DGRAM) #create UDP socket

s.bind(('', PORT))

while 1:

data, addr = s.recvfrom(1024) #wait for a packet

if data.startswith(MAGIC):

print "got service announcement from", data[len(MAGIC):]

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