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QProgressBar, progress bar control, is easy to use. But how to realize the download progress bar with the download function?

This article mainly refers to< PyQt5 Implementation of Download Progress Bar > Thank you for sharing this article.
One of the download threads, the basic seals of the copy, this download thread is the technical point.

Download thread

This download thread, in fact, contains a lot of knowledge points, you can learn more from it.

[The following code, complete replication, direct operation, you can use]

import sys
from PyQt5.QtWidgets import *
from PyQt5.QtGui import *
from PyQt5.QtCore import *

import queue     #If this template is not loaded, pyinstaller may not be able to run the requests template after packaging
import requests
################################################


################################################
class Widget(QWidget):
    def __init__(self, *args, **kwargs):
        super(Widget, self).__init__(*args, **kwargs)
        layout = QHBoxLayout(self)

        # Increase progress bar
        self.progressBar = QProgressBar(self, minimumWidth=400)
        self.progressBar.setValue(0)
        layout.addWidget(self.progressBar)

        # Add Download Button
        self.pushButton = QPushButton(self, minimumWidth=100)
        self.pushButton.setText("download")
        layout.addWidget(self.pushButton)

        # Binding Button Event
        self.pushButton.clicked.connect(self.on_pushButton_clicked)




    # Download button event
    def on_pushButton_clicked(self):
        the_url = 'http://cdn2.ime.sogou.com/b24a8eb9f06d6bfc08c26f0670a1feca/5c9de72d/dl/index/1553820076/sogou_pinyin_93e.exe'
        the_filesize = requests.get(the_url, stream=True).headers['Content-Length']
        the_filepath ="D:/sogou_pinyin_93e.exe"
        the_fileobj = open(the_filepath, 'wb')
        #### Create a download thread
        self.downloadThread = downloadThread(the_url, the_filesize, the_fileobj, buffer=10240)
        self.downloadThread.download_proess_signal.connect(self.set_progressbar_value)
        self.downloadThread.start()



    # Setting progress bar
    def set_progressbar_value(self, value):
        self.progressBar.setValue(value)
        if value == 100:
            QMessageBox.information(self, "Tips", "Download success!")
            return






##################################################################
#Download thread
##################################################################
class downloadThread(QThread):
    download_proess_signal = pyqtSignal(int)                        #Create signal

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


    def run(self):
        try:
            rsp = requests.get(self.url, stream=True)                #Streaming download mode
            offset = 0
            for chunk in rsp.iter_content(chunk_size=self.buffer):
                if not chunk: break
                self.fileobj.seek(offset)                            #Setting Pointer Position
                self.fileobj.write(chunk)                            #write file
                offset = offset + len(chunk)
                proess = offset / int(self.filesize) * 100
                self.download_proess_signal.emit(int(proess))        #Sending signal
            #######################################################################
            self.fileobj.close()    #Close file
            self.exit(0)            #Close thread


        except Exception as e:
            print(e)





####################################
#Program entry
####################################
if __name__ == "__main__":
    app = QApplication(sys.argv)
    w = Widget()
    w.show()
    sys.exit(app.exec_())

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