PyQt5 渲染与 QWebEngineView [英] PyQt5 render with QWebEngineView

问题描述

我想将网页渲染到屏幕外的图像，但是当我使用以下代码时，输​​出图像是空白的，我无法解决问题

I want render the webpage to an image offscreen, however when I use following code, the output image is blank, I can't solve the problem

class PageShotter(QWidget):
    def __init__(self,url,parent=None):
        QWidget.__init__(self,parent)
        self.url = url
    def shot(self):
        self.webview = QtWebEngineWidgets.QWebEngineView(self)
        self.webview.load(QtCore.QUrl(self.url))
        webpage = self.webview.page()
        self.webview.setVisible(True)
        self.webview.loadFinished.connect(self.save)
    def save(self,finished):
        if finished:
            size = self.webview.contentsRect()
            print(u"width：%d，hight：%d" % (size.width(), size.height()))            
            img = QtGui.QImage(size.width(), size.height(), QtGui.QImage.Format_ARGB32)
            painter = QtGui.QPainter(img)            
            self.webview.render(painter,QtCore.QPoint())
            painter.end()
            filename = 'page.png'
            if img.save(filename):
                filepath = os.path.join(os.path.dirname(__file__), filename)
                print(u"success：%s" % filepath)
            else:
                print(u"fail")
        else:
            print("Error")


if __name__ == '__main__':
    import sys
    app = QApplication(sys.argv)
    shotter = PageShotter(web_site.base_url)
    shotter.shot()
    app.exec()

推荐答案

您必须启用 ScreenCaptureEnabled 属性，为此您必须先启用 PluginsEnabled 属性.此外，内容是在使用 show 后呈现的，但由于您不想显示小部件，我们启用了 WA_DontShowOnScreen 属性.

You must enable the ScreenCaptureEnabled attribute, for this you must first enable the PluginsEnabled attribute. In addition, the content is rendered after using show, but as you do not want to show the widget, we enable the WA_DontShowOnScreen attribute.

import os
from PyQt5 import QtCore, QtGui, QtWidgets, QtWebEngineWidgets

class PageShotter(QtWebEngineWidgets.QWebEngineView):
    def __init__(self, url, parent=None):
        super(PageShotter, self).__init__(parent)
        self.loadFinished.connect(self.save)
        self.url = url
        self.setAttribute(QtCore.Qt.WA_DontShowOnScreen, True)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose, True)
        self.show()
        settings = QtWebEngineWidgets.QWebEngineSettings.globalSettings()
        for attr in (QtWebEngineWidgets.QWebEngineSettings.PluginsEnabled, 
                     QtWebEngineWidgets.QWebEngineSettings.ScreenCaptureEnabled,):
            settings.setAttribute(attr, True)

    def shot(self):
        if self.size().isNull():
            self.resize(640, 480)
        self.load(QtCore.QUrl.fromLocalFile(self.url))

    @QtCore.pyqtSlot(bool)
    def save(self, finished):
        if finished:
            size = self.contentsRect()
            print(u"width：%d，hight：%d" % (size.width(), size.height()))
            img = QtGui.QImage(size.width(), size.height(), QtGui.QImage.Format_ARGB32)
            painter = QtGui.QPainter(img)
            self.render(painter)
            painter.end()
            filename = 'page.png'
            if img.save(filename):
                filepath = os.path.join(os.path.dirname(__file__), filename)
                print(u"success：%s" % filepath)
            else:
                print(u"fail")
        else:
            print("Error")
        self.close()


if __name__ == '__main__':
    import sys

    app = QtWidgets.QApplication(sys.argv)
    shotter = PageShotter(r'C:\Output.html')
    shotter.shot()
    app.exec()

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