我需要在wxPython应用程序中下载一个url列表，但我对线程很新，有没有人能给我看一个如何下载链接并将输出放在wx控件中的工作示例。
答案 0 :(得分：3)
看到你做了什么至少试图实现这一目标会很高兴。无论如何，有一些很好的资源可以学习如何在wxPython中做线程。他们在这里：
我写了一篇关于使用urllib / urllib2下载文件的教程，请求：
如果将这三篇文章合并在一起，就可以得出答案。但是，我继续编写了一个超级简单的下载程序：
import requests
import os
import wx
import wx.lib.scrolledpanel as scrolled
from threading import Thread
from wx.lib.pubsub import pub
########################################################################
class DownloadThread(Thread):
"""Downloading thread"""
#----------------------------------------------------------------------
def __init__(self, gnum, url, fsize):
"""Constructor"""
Thread.__init__(self)
self.fsize = fsize
self.gnum = gnum
self.url = url
self.start()
#----------------------------------------------------------------------
def run(self):
"""
Run the worker thread
"""
local_fname = os.path.basename(self.url)
count = 1
while True:
if os.path.exists(local_fname):
tmp, ext = os.path.splitext(local_fname)
cnt = "(%s)" % count
local_fname = tmp + cnt + ext
count += 1
else:
break
req = requests.get(self.url, stream=True)
total_size = 0
print local_fname
with open(local_fname, "wb") as fh:
for byte in req.iter_content(chunk_size=1024):
if byte:
fh.write(byte)
fh.flush()
total_size += 1024
if total_size < self.fsize:
wx.CallAfter(pub.sendMessage,
"update_%s" % self.gnum,
msg=total_size)
print "DONE!"
wx.CallAfter(pub.sendMessage,
"update_%s" % self.gnum,
msg=self.fsize)
########################################################################
class MyGauge(wx.Gauge):
""""""
#----------------------------------------------------------------------
def __init__(self, parent, range, num):
"""Constructor"""
wx.Gauge.__init__(self, parent, range=range)
pub.subscribe(self.updateProgress, "update_%s" % num)
#----------------------------------------------------------------------
def updateProgress(self, msg):
""""""
self.SetValue(msg)
########################################################################
class MyPanel(scrolled.ScrolledPanel):
""""""
#----------------------------------------------------------------------
def __init__(self, parent):
"""Constructor"""
scrolled.ScrolledPanel.__init__(self, parent)
self.data = []
self.download_number = 1
# create the sizers
self.main_sizer = wx.BoxSizer(wx.VERTICAL)
dl_sizer = wx.BoxSizer(wx.HORIZONTAL)
# create the widgets
lbl = wx.StaticText(self, label="Download URL:")
self.dl_txt = wx.TextCtrl(self)
btn = wx.Button(self, label="Download")
btn.Bind(wx.EVT_BUTTON, self.onDownload)
# layout the widgets
dl_sizer.Add(lbl, 0, wx.ALL|wx.CENTER, 5)
dl_sizer.Add(self.dl_txt, 1, wx.EXPAND|wx.ALL, 5)
dl_sizer.Add(btn, 0, wx.ALL, 5)
self.main_sizer.Add(dl_sizer, 0, wx.EXPAND)
self.SetSizer(self.main_sizer)
self.SetAutoLayout(1)
self.SetupScrolling()
#----------------------------------------------------------------------
def onDownload(self, event):
"""
Update display with downloading gauges
"""
url = self.dl_txt.GetValue()
try:
header = requests.head(url)
fsize = int(header.headers["content-length"]) / 1024
sizer = wx.BoxSizer(wx.HORIZONTAL)
fname = os.path.basename(url)
lbl = wx.StaticText(self, label="Downloading %s" % fname)
gauge = MyGauge(self, fsize, self.download_number)
sizer.Add(lbl, 0, wx.ALL|wx.CENTER, 5)
sizer.Add(gauge, 0, wx.ALL|wx.EXPAND, 5)
self.main_sizer.Add(sizer, 0, wx.EXPAND)
self.Layout()
# start thread
DownloadThread(self.download_number, url, fsize)
self.download_number += 1
except Exception, e:
print "Error: ", e
########################################################################
class DownloaderFrame(wx.Frame):
""""""
#----------------------------------------------------------------------
def __init__(self):
"""Constructor"""
wx.Frame.__init__(self, None, title="Downloader", size=(800, 400))
panel = MyPanel(self)
self.Show()
#----------------------------------------------------------------------
if __name__ == "__main__":
app = wx.App(False)
frame = DownloaderFrame()
app.MainLoop()
注意：您需要requests才能使用此脚本。