Progressbar in PYQT5 with Python

[monamour]

Dear All,

I have created a desktop application by PYQT5 and python 3.7, to download  a video by clicking the download button and save it locally in the PC. 

 The code will fetch the video link from **(lineEdit.text())** which is labeled "URL" and save it in the local directory in **(lineEdit_2.text)** which is labeled "SAVE AS". If the download stops for any reason, it will be resumed again by press the start  download button.

The  question is, I want to connect the start button with a Progressbar and displaying the loading in percentage, from start downloading 1% to finish 100%. Please see the code below and the picture.

The code

 def curl_progress(self,total, existing,upload_t,upload_d):

        try:
            frac = float(existing)/float(total)


        except ZeroDivisionError:
            frac =0

        print("Downloaded %d/%d (%0.2f%%)" % (existing, total, frac))

        if frac ==1.0:
            self.textBrowser.append("Done")
            exit()
        else:
            self.textBrowser.append(("Downloaded %d/%d (%0.2f%%)" % (existing, total, frac)))





    def curl_limit_rate(self,rate_limit):
        url= self.lineEdit.text()
        save_location = self.lineEdit_2.text()

        c = pycurl.Curl()
        #For SSL certification
        c.setopt(pycurl.CAINFO, certifi.where())
        c.setopt(c.URL, url)
        c.setopt(c.MAX_RECV_SPEED_LARGE, rate_limit)
        if os.path.exists(save_location):
            file_id = open(save_location, "ab")
            c.setopt(c.RESUME_FROM, os.path.getsize(save_location))
        else:
            file_id = open(save_location, "wb")

        c.setopt(c.WRITEDATA, file_id)
        c.setopt(c.NOPROGRESS, 0)
        c.setopt(c.PROGRESSFUNCTION, self.curl_progress)
        c.perform()

The picture

Many thanks in advance,

[JonB]

@monamour
So in outline:

self.pb = QProgressBar(self)
self.pb.setRange(0, 100)
# self.pb.show()
....
frac = float(existing)/float(total)
self.pb.setValue(frac * 100)

That's the principle. I cannot recall whether QProgressBar is one which updates itself without needing to go into an event loop, if not then you'll need a QCoreApplication.processEvents() somewhere, but I suspect your "video download curl progress update" already has that so you won't need your own?

[monamour]

@JonB Thanks so much, it solved.