python-广播

  #!/usr/bin/python
 #coding=utf-8
 #广播端
 import sys,socket
 import time

 s=socket.socket(socket.AF_INET,socket.SOCK_DGRAM) #创建数据报套接字
 s.setsockopt(socket.SOL_SOCKET,socket.SO_BROADCAST,1) #设置套接字选项可以发送广播
 dest=('broadcast',5455)  #广播地址默认的.255
 #不用绑定,不用监听,不用accept
 print "waiting for ..."
 while 1:
     time.sleep(1)
     s.sendto("hello",dest)  #发送
     buf,addr=s.recvfrom(1024) #接收
     if not len(buf):break
     print "REcv from:",addr   #打印

 #!/usr/bin/python
 #coding=utf-8
 #接收端
 import socket,traceback

 HOST = ''
 PORT = 9999

 s = socket.socket(socket.AF_INET,socket.SOCK_DGRAM)
 s.setsockopt(socket.SOL_SOCKET,socket.SO_REUSEADDR,1)
 s.setsockopt(socket.SOL_SOCKET,socket.SO_BROADCAST,1)
 s.bind((HOST,PORT))

 while True:
     try:
         message,address = s.recvfrom(4096)
         print "Got data from",address
         s.sendto("I am here",address)
     except (KeyboardInterrupt,SystemExit):
         raise
     except:
         traceback.print_exc()