Jake Code

# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtCore, QtGui
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtNetwork import QHttp

class QDownloader(QWidget):
  def __init__(self, parent=None):
    QTabWidget.__init__(self, parent)
    self.parent = parent
    self.url = ""
    self.downloadPath = ""
    self.qhttp = QHttp(self)
    self.progressbar = QProgressBar(self)
    self.cancel = QPushButton("Cancel", self)
    self.layout = QHBoxLayout(self)
    self.layout.addWidget(self.progressbar)
    self.layout.addWidget(self.cancel)
    self.show()
    self.resize(self.size().width()*2, self.size().height())
    self.connect(self.cancel, QtCore.SIGNAL("clicked()"), self.cancelDownload)
    self.connect(self.qhttp, QtCore.SIGNAL("requestFinished(int, bool)"), self.httpRequestFinished)
    self.connect(self.qhttp, QtCore.SIGNAL("dataReadProgress(int, int)"), self.updateDataReadProgress)

  def download(self):
    url = QUrl(self.url)
    self.qhttp.setHost(url.host())
    url = QUrl.toPercentEncoding(url.path(), "!$&'()*+,;=:@/")
    self.downloadPathName = QFile(self.downloadPath)
    self.downloadPathName.open(QIODevice.WriteOnly)
    self.downloadID = self.qhttp.get(QString(url), self.downloadPathName)

  def httpRequestFinished(self, requestID, error):
    if not requestID == self.downloadID:
      return
    self.downloadPathName.close()
    self.close()

  def updateDataReadProgress(self, done, total):
    self.progressbar.setMaximum(total)
    self.progressbar.setValue(done)

  def cancelDownload(self):
    self.qhttp.abort()
    self.downloadPathName.close()
    self.downloadPathName.remove()
    self.close()