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python脚本设置超时机制系统时间的方法

yipeiwu_com7年前 (2020-03-06)Python基础

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。