python - 使用 pycurl 暂停和恢复下载

Question

我正在编写代码来使用pycurl下载文件。所以我想知道是否有可能暂停我的下载，然后从暂停的地方恢复下载？ pycurl 是否支持这些功能，或者是否有其他库支持暂停和恢复？

Answer 1

import os
import pycurl
import sys


def progress(total, existing, upload_t, upload_d):
    existing = existing + os.path.getsize(filename)
    try:
        frac = float(existing)/float(total)
    except:
        frac = 0
    sys.stdout.write("\r%s %3i%%" % ("File downloaded - ", frac*100))

url = raw_input('Enter URL to download folder/file: ')
filename = url.split("/")[-1].strip()


def test(debug_type, debug_msg):
    print "debug(%d): %s" % (debug_type, debug_msg)

c = pycurl.Curl()
c.setopt(pycurl.URL, url)
c.setopt(pycurl.FOLLOWLOCATION, 1)
c.setopt(pycurl.MAXREDIRS, 5)

# Setup writing
if os.path.exists(filename):
    f = open(filename, "ab")
    c.setopt(pycurl.RESUME_FROM, os.path.getsize(filename))
else:
    f = open(filename, "wb")

c.setopt(pycurl.WRITEDATA, f)

#c.setopt(pycurl.VERBOSE, 1) 
c.setopt(pycurl.DEBUGFUNCTION, test)
c.setopt(pycurl.NOPROGRESS, 0)
c.setopt(pycurl.PROGRESSFUNCTION, progress)
try:
    c.perform()
except:
    pass

可以下载文件，例如 - *.tar、.dmg、.exe、jpg 等。

使用pycurl进行简历下载。

测试此代码为:

• 在终端上运行此文件，例如:

这是登录终端，

anupam@anupampc:~/Documents$ python resume_download.py 

Enter URL to download folder/file: http://nightly.openerp.com/6.0/6.0/openerp-allinone-setup-6.0-20110625-r3451.exe 

File downloaded - 199%

如果您通过按 Ctrl + C 停止此下载并启动下载文件/文件夹的过程，它将从停止的位置开始。