在本地网络上进行服务公告/发现的一种简单方法是广播 UDP 数据包。
常数:
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, ('<broadcast>', PORT))
print "sent service announcement"
sleep(5)
发现:
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):]
此代码改编自python.org 上的演示