javascript - 来自 QWebPage 的 QImage 未完全呈现

Question

我想在完全加载时将页面内容保存到图像，但有时我得到的输出栅格未完全呈现。

import sys
import signal
import os
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import QWebPage

app = QApplication(sys.argv)
signal.signal(signal.SIGINT, signal.SIG_DFL)
webpage = QWebPage()
def onLoadFinished(result):
    if not result:
        print "Request failed"
        sys.exit(1)
    webpage.setViewportSize(webpage.mainFrame().contentsSize())
    image = QImage(webpage.viewportSize(), QImage.Format_ARGB32)
    painter = QPainter(image)
    webpage.mainFrame().render(painter)
    painter.end()
    if os.path.exists("output.png"):
        os.remove("output.png")
    image.save("output.png")
    sys.exit(0) # quit this application

webpage.mainFrame().load(QUrl("file:///page.html"))
webpage.connect(webpage, SIGNAL("loadFinished(bool)"), onLoadFinished)
sys.exit(app.exec_())

该页面正在使用 JavaScript(onload 函数)获取谷歌地图 (640x640px)。

Answer 1

结帐 this question .使用 QWebPage.mainFrame().evaluateJavaScript() 方法添加此 javascript 代码:

google.maps.event.addListenerOnce(map, 'idle', function(){
    // do something only the first time the map is loaded
});

您可能还会发现有用的 QWebFrame::addToJavaScriptWindowObject ( const QString & name, QObject * object )方法。