QWebPage中的QImage未完全渲染

Question

我想在完全加載時將頁面內容保存到圖像，但有時候我得到的輸出柵格未完全渲染。

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_()) 

該頁面使用JavaScript（onload函數）獲取谷歌地圖（640x640px）。

Image http://i56.tinypic.com/15ojg3s.png

Answer 1

結帳this question。使用QWebPage.mainFrame().evaluateJavaScript()方法添加這段JavaScript代碼：

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

您也可能會發現有用的QWebFrame::addToJavaScriptWindowObject (const QString & name, QObject * object)方法。