python脚本设置超时机制系统时间的方法

本文为大家介绍了python脚本设置系统时间的方法，一共有两种，其一是调用socket直接发送udp包到国家授时中心，其二是调用ntplib包。我在本地电脑ping 国家授时中心地址cn.pool.ntp.org有时出现丢包，然而，二者都没有检查udp是否丢包的机制，方法一在udp丢包后一直处于阻塞状态无法退出，方法二虽然会提示超时，但是不再做其它尝试，比如重新发包，或者向同一个域名的不同IP地址发包。于是，尝试在方法一的代码基础上，增加了超时机制，并且尝试向同一个域名的不同IP地址发包。

具体修改后的完整代码如下：

    #-*- coding:utf-8 -*-

    import socket
    import struct
    import time
    import win32api
    import os
    import re


    def getTime(TimeServerAddresses):
      TIME_1970 = 2208988800L
      client = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
      client.settimeout(3)
      data = '\x1b' + 47 * '\0'
      #TimeServer_ip=socket.gethostbyname('cn.pool.ntp.org')
      #TimeServer_ip='202.118.1.130'
      Port=123
      for address in TimeServerAddresses:
        success=False
        count=0
        while not success and count<3:
          print address,count
          try:
            client.sendto(data, (address, Port))
            data, address = client.recvfrom(1024)
            success=True
          except socket.timeout:
            print 'Request timed out!'
            count=count+1
        if success==True:a
          break
      data_result = struct.unpack('!12I', data)[10]
      data_result -= TIME_1970
      return data_result

    def setSystemTime(now_time):
      tm_year, tm_mon, tm_mday, tm_hour, tm_min, tm_sec, tm_wday, tm_yday, tm_isdst = time.gmtime(now_time)
      win32api.SetSystemTime(tm_year, tm_mon, tm_wday, tm_mday, tm_hour, tm_min, tm_sec, 0)
      print "Set System OK!"

    def getServerIP():
      res1=os.popen('nslookup cn.pool.ntp.org')
      result1=res1.read()
      addresses=result1.split('\n\n')[1].split('\n')[1][12:].split(',')
      return addresses
      #for address in addresses:
      #  res=os.popen('ping -n 2 '+address)
      #  result=res.read()
      #  received_num=int(re.findall('Received = [0-9]',result)[0].split('=')[1])
      #  if received_num > 1:
      #    break
      #TimeServer=address


    if __name__ == '__main__':
      addresses=getServerIP()
      now_time=getTime(addresses)
      setSystemTime(now_time)
      print "%d-%d-%d %d:%d:%d" % time.localtime(now_time)[:6]

以上就是本文的全部内容，希望对大家的学习有所帮助。