PyQt 等待页面加载
我想在完全加载时将页面内容保存到图像中，但有时我得到的输出光栅未完全渲染。
代码：
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_())
页面正在使用JavaScript（onload函数）获取谷歌地图（640x640px）。
I want to save a page content to an image when it is fully loaded but sometimes i am getting output raster not rendered completely.
Code:
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_())
Page is using JavaScript (onload function) to acquire google map (640x640px) .
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评论（1）
我不确定这是否可能。对于静态网站，这可能可行，但谷歌地图将动态加载图块，我怀疑它会发出可用的“我完成了”信号。
但你似乎只想要一张谷歌地图的图像？你看过他们的API吗？它们允许您通过构建网址来生成静态地图。
示例
I'm not sure if this even possible. For a static website this could probably work, but Google Maps will load tiles dynamically, and I'm in doubt it will emit a usuable "I'm done" signal.
But it seems you only want an image of a Google map? Have you looked at their API? They allow you to generate static maps, just by building a URL.
Example