PyQt5实现下载进度条效果

起因是因为公司要开发一款自动登录某网站的助手工具提供给客户使用，要使用到selenium，所以选择了pyqt5的方式来开发这个C/S架构的客户端

在过程中要用到自动更新的功能，所以自己写一个下载进度的插件给大家分享，本人编程水平有点菜，不要见怪。

界面文件UI_download.py

# -*- coding: utf-8 -*- 

from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.Qt import Qt 

class Ui_download(object):
  def setupUi(self, Dialog):
    Dialog.setWindowFlags(Qt.FramelessWindowHint)
    Dialog.setObjectName("Dialog")
    Dialog.resize(300, 56)
    Dialog.setFixedSize(Dialog.width(), Dialog.height())
    sizePolicy = QtWidgets.QSizePolicy(QtWidgets.QSizePolicy.Fixed, QtWidgets.QSizePolicy.Fixed)
    sizePolicy.setHorizontalStretch(0)
    sizePolicy.setVerticalStretch(0)
    sizePolicy.setHeightForWidth(Dialog.sizePolicy().hasHeightForWidth())
    Dialog.setSizePolicy(sizePolicy)
    Dialog.setSizeGripEnabled(True)
    self.gridLayout = QtWidgets.QGridLayout(Dialog)
    self.gridLayout.setSizeConstraint(QtWidgets.QLayout.SetDefaultConstraint)
    self.gridLayout.setObjectName("gridLayout")
    self.progressBar = QtWidgets.QProgressBar(Dialog)
    self.progressBar.setProperty("value", 0)
    self.progressBar.setAlignment(QtCore.Qt.AlignLeading|QtCore.Qt.AlignLeft|QtCore.Qt.AlignVCenter)
    self.progressBar.setObjectName("progressBar")
    self.gridLayout.addWidget(self.progressBar, 1, 0, 1, 1)
    self.label = QtWidgets.QLabel(Dialog)
    self.label.setObjectName("label")
    self.gridLayout.addWidget(self.label, 0, 0, 1, 1) 

    self.retranslateUi(Dialog)
    QtCore.QMetaObject.connectSlotsByName(Dialog) 

  def retranslateUi(self, Dialog):
    _translate = QtCore.QCoreApplication.translate
    Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
    self.label.setText(_translate("Dialog", "客户端更新下载中...")) 

if __name__ == "__main__":
  import sys
  app = QtWidgets.QApplication(sys.argv)
  Dialog = QtWidgets.QDialog()
  ui = Ui_download()
  ui.setupUi(Dialog)
  Dialog.show()
  sys.exit(app.exec_())

实现文件download.py

# -*- coding: utf-8 -*- 

"""
Module implementing Dialog.
""" 

from PyQt5.QtCore import QThread, pyqtSignal
from PyQt5.QtWidgets import QDialog
from PyQt5 import QtWidgets
from Ui_download import Ui_download
import os
import sys
import requests 

class downloadThread(QThread): 

  download_proess_signal = pyqtSignal(int) 

  def __init__(self, download_url, filesize, fileobj, buffer):
    super(downloadThread, self).__init__()
    self.download_url = download_url
    self.filesize = filesize
    self.fileobj = fileobj
    self.buffer = buffer 

  def run(self):
    try:
      f = requests.get(self.download_url, stream=True)
      offset = 0
      for chunk in f.iter_content(chunk_size=self.buffer):
        if not chunk:
          break
        self.fileobj.seek(offset)
        self.fileobj.write(chunk)
        offset = offset + len(chunk)
        proess = offset / int(self.filesize) * 100
        self.download_proess_signal.emit(int(proess))
      self.fileobj.close()
      self.exit(0)
    except Exception as e:
      print(e) 

class download(QDialog, Ui_download):
  """
  下载类实现
  """
  def __init__(self, download_url, auto_close=True, parent=None):
    """
    Constructor 

    @download_url:下载地址
    @auto_close:下载完成后时候是否需要自动关闭
    """
    super(download, self).__init__(parent)
    self.setupUi(self)
    self.progressBar.setValue(0)
    self.downloadThread = None
    self.download_url = download_url
    self.filesize = None
    self.fileobj = None
    self.auto_close = auto_close
    self.download() 

  def download(self):
    self.filesize = requests.get(self.download_url, stream=True).headers['Content-Length']
    path = os.path.join("update", os.path.basename(self.download_url))
    self.fileobj = open(path, 'wb')
    self.downloadThread = downloadThread(self.download_url, self.filesize, self.fileobj, buffer=10240)
    self.downloadThread.download_proess_signal.connect(self.change_progressbar_value)
    self.downloadThread.start() 

  def change_progressbar_value(self, value):
    self.progressBar.setValue(value)
    if self.auto_close and value == 100:
      self.close() 

if __name__ == '__main__':
  app = QtWidgets.QApplication(sys.argv)
  ui = download()
  ui.show()
  sys.exit(app.exec_())

比较通用的一个下载模块，初始化调用的时候只需要传入要下载的地址就行，下载操作采取异步，以防阻塞UI，确保程序目录下拥有update目录存在，默认我是将要更新的文件放在这个目录下面，还有优化的地方希望大家可以指出。

运行后效果：

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持我们。

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