我正在使用我的python脚本从我的服务器下载xml文件并将数据并行写入sqlite3数据库。
我需要一些关于如何使用urllib2库从我的服务器取消连接的帮助。我希望数据库在连接被取消后立即停止写入数据。当用户点击“输入”时，系统会调用allchannels_timer。按钮，在连接到我的服务器之前等待一秒钟以下载xml文件。当我点击退格按钮时，我想下载停止但是目前，代码仍然没有发生任何事情。
这是我目前的代码：
import urllib2
import StringIO
import sqlite3
import threading
from sqlite3 import dbapi2 as database
from xml.etree import ElementTree
import xml.etree.ElementTree as ET
from UserDict import DictMixin
#get actioncodes from keyboard.xml
ACTION_ENTER = 7
ACTION_BACKSPACE = 110
def cSetVisible(WiNdOw,iD,V=True): WiNdOw.getControl(iD).setVisible(V)
class MyClass(xbmcgui.WindowXML):
def timer1_8percent(self):
for i in range(1):
time.sleep(1)
self.getControl(4202).setLabel("8%")
def timer1_12percent(self):
for i in range(1):
time.sleep(2)
self.getControl(4202).setLabel("12%")
def timer1_18percent(self):
for i in range(1):
time.sleep(3)
self.getControl(4202).setLabel("18%")
def allchannels_timer(self):
for i in range(1):
time.sleep(0.3)
self.getControl(4202).setLabel("0%")
#DOWNLOAD THE XML SOURCE HERE
url = ADDON.getSetting('allchannel.url')
req = urllib2.Request(url)
response = urllib2.urlopen(req)
data = response.read()
response.close()
profilePath = xbmc.translatePath(os.path.join('special://userdata/addon_data/script.tvguide', ''))
self.getControl(4202).setLabel("1%")
self.thread = threading.Thread(target=self.timer1_8percent)
self.thread.setDaemon(True)
self.thread.start()
self.thread = threading.Thread(target=self.timer1_12percent)
self.thread.setDaemon(True)
self.thread.start()
self.thread = threading.Thread(target=self.timer1_18percent)
self.thread.setDaemon(True)
self.thread.start()
if os.path.exists(profilePath):
profilePath = profilePath + 'source.db'
con = database.connect(profilePath)
cur = con.cursor()
cur.execute('CREATE TABLE programs(channel TEXT, title TEXT, start_date TIMESTAMP, stop_date TIMESTAMP, description TEXT)')
con.commit()
con.close
tv_elem = ElementTree.parse(StringIO.StringIO(data)).getroot()
profilePath = xbmc.translatePath(os.path.join('special://userdata/addon_data/script.tvguide', ''))
profilePath = profilePath + 'source.db'
con = sqlite3.connect(profilePath)
cur = con.cursor()
channels = OrderedDict()
# Get the loaded data
for channel in tv_elem.findall('channel'):
channel_name = channel.find('display-name').text
for program in channel.findall('programme'):
title = program.find('title').text
start_time = program.get("start")
stop_time = program.get("stop")
cur.execute("INSERT INTO programs(channel, title, start_date, stop_date)" + " VALUES(?, ?, ?, ?)", [channel_name, title, start_time, stop_time])
con.commit()
con.close
print 'Channels store into database are now successfully!'
program = None
now = datetime.datetime.now()
#strCh = '(\'' + '\',\''.join(channelMap.keys()) + '\')'
cur.execute('SELECT channel, title, start_date, stop_date FROM programs WHERE channel')
getprogram_info = cur.fetchall()
for row in getprogram_info:
programming = row[0], row[1], row[2], row[3]
print programming
#print row[0], row[1], row[2], row[3]
#programming = row[0], row[1], row[2], row[3]
#programming = row[0], row[1], row[2], row[3]
#cur.close()
def onAction(self, action):
img1_yellow = xbmc.getCondVisibility('Control.IsVisible(3)')
if action == ACTION_BACKSPACE:
if img1_yellow:
cSetVisible(self,3,True)
self.getControl(4202).setLabel("")
#cancel the connection and close the database
if action == ACTION_ENTER:
if img1_yellow:
cSetVisible(self,3,False)
self.thread = threading.Thread(target=self.allchannels_timer)
self.thread.setDaemon(True)
self.thread.start()
有人可以告诉我如何从服务器取消连接，以便xml文件停止下载。我还想知道一旦取消连接，我怎么能阻止数据写入我的数据库。
我非常感谢有关我的问题的任何帮助，一些示例代码将受到高度赞赏。
答案 0 :(得分：0)
要在后台下载文件，在前台处理事件时，使用Process要简单得多。他们有更好的Python支持，他们可以在I / O之外执行CPU，并且如果它们起作用，它们就可以运行。
以下开始后台进程。父主的循环做了自己的事情，简要检查下载是否偶尔完成。如果下载完成，则继续处理，然后退出。
玩得开心！
import logging, multiprocessing, time, urllib2
def download(url):
mylog = multiprocessing.get_logger()
mylog.info('downloading %s', url)
time.sleep(2)
req = urllib2.Request(url)
response = urllib2.urlopen(req)
data = response.read()
response.close()
# more here
time.sleep(3)
mylog.info('done')
def main():
mylog = multiprocessing.log_to_stderr(level=logging.INFO)
mylog.info('start')
download_proc = multiprocessing.Process(
target=download,
args=('http://example.com',),
)
download_proc.start()
while True:
mylog.info('ding')
if download_proc.join(timeout=0.1) is None:
mylog.info('download done!')
break
time.sleep(1)
mylog.info('done!')
if __name__=='__main__':
main()
[INFO/MainProcess] start
[INFO/MainProcess] ding
[INFO/Process-1] child process calling self.run()
[INFO/Process-1] downloading http://example.com
[INFO/MainProcess] download done!
[INFO/MainProcess] done!
[INFO/MainProcess] process shutting down
[INFO/MainProcess] calling join() for process Process-1
[INFO/Process-1] done
[INFO/Process-1] process shutting down
[INFO/Process-1] process exiting with exitcode 0