[Python] Saving a website screenshot with pyqt6 / QtWebEngineView is always empty

I'm trying to save a screenshot of a website with QtWebEngineView, but the resulting image always ends up being empty.


import sys
import time
from PyQt6.QtCore import *
from PyQt6.QtGui import *
from PyQt6.QtWidgets import QApplication, QWidget
from PyQt6.QtWebEngineWidgets import QWebEngineView

class Screenshot(QWebEngineView):
def __init__(self):
self.app = QApplication(sys.argv)
QWebEngineView.__init__(self)
self._loaded = False
self.loadFinished.connect(self._loadFinished)

def capture(self, url, output_file):
self.resize(QSize(1024, 768))
self.load(QUrl(url))
self.wait_load()

image = QImage(self.size(), QImage.Format.Format_ARGB32)
painter = QPainter(image)
self.render(painter)
painter.end()
image.save(output_file)

def wait_load(self, delay=0):
# process app events until page loaded
while not self._loaded:
self.app.processEvents()
time.sleep(delay)
self._loaded = False

def _loadFinished(self, result):
self._loaded = True

s = Screenshot()
s.capture("https://www.google.com", "screenshot.png")


I've tried variations of the code where the QTWebEngineView is rendered in an application window and that part works. The wait_load also ensures the website is loaded before proceeding to paint. Yet somehow the rendered image is always a full white png instead of the website.

Edit: Voting to reopen because the solution in the "duplicate" does not seem to resolve this case.

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