主页 / coding / 问题 / 79323979
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kontur
Asked: 2025-01-02 22:13:41 +0800 CST

使用 pyqt6 / QtWebEngineView 保存网站截图始终为空

  • 772

我正在尝试使用 QtWebEngineView 保存网站的屏幕截图，但生成的图像总是空的。


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")

我尝试过各种代码，其中 QTWebEngineView 在应用程序窗口中呈现，并且该部分可以正常工作。它还wait_load确保在继续绘制之前加载网站。但不知何故，渲染的图像始终是全白 png，而不是网站。

编辑：投票重新开庭，因为“重复”中的解决方案似乎无法解决此案。

python

1 个回答

  1. Best Answer

    问题是由于未调用 show() 方法导致 QWebengineView 未被渲染。如其他帖子中所述，您还应该使用Qt.WidgetAttribute.WA_DontShowOnScreen。这是一个避免使用time.sleep和 的版本QXApplication.processEvents。

    import sys
from PyQt6.QtCore import Qt, QEventLoop, QSize, QUrl
from PyQt6.QtGui import QImage, QPainter
from PyQt6.QtWidgets import QApplication
from PyQt6.QtWebEngineWidgets import QWebEngineView


class Screenshot(QWebEngineView):
    def __init__(self):
        self.app = QApplication(sys.argv)
        QWebEngineView.__init__(self)
        self.setAttribute(Qt.WidgetAttribute.WA_DontShowOnScreen)
        self.show()
        self._output_file = ""
        self._loop = QEventLoop()
        self.loadFinished.connect(self._loop.quit)

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

    def wait_load(self):
        self._loop.exec()
        image = QImage(self.size(), QImage.Format.Format_ARGB32)
        painter = QPainter(image)
        self.render(painter)
        painter.end()
        image.save(self._output_file)


s = Screenshot()
for i in range(10):
    s.capture("https://www.google.com", f"screenshot{i}.png")
    • 2

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