我不知道关于Qt的第一件事,但我试图做一个厚脸皮,并从别处借用代码(http://lateral.netmanagers.com.ar/weblog/posts/BB901.html#disqus_thread)。 ;)如何正确关闭PyQt的QtApplication?
我有一个问题。当我第一次运行test()时,一切都会顺利进行。但是,当我第二次运行它时,会出现讨厌的段错误。我怀疑问题是我没有正确地结束qt的东西。我应该怎样改变这个程序使它多次工作?提前致谢!
from PyQt4 import QtCore, QtGui, QtWebKit
import logging
logging.basicConfig(level=logging.DEBUG)
class Capturer(object):
"""A class to capture webpages as images"""
def __init__(self, url, filename, app):
self.url = url
self.app = app
self.filename = filename
self.saw_initial_layout = False
self.saw_document_complete = False
def loadFinishedSlot(self):
self.saw_document_complete = True
if self.saw_initial_layout and self.saw_document_complete:
self.doCapture()
def initialLayoutSlot(self):
self.saw_initial_layout = True
if self.saw_initial_layout and self.saw_document_complete:
self.doCapture()
def capture(self):
"""Captures url as an image to the file specified"""
self.wb = QtWebKit.QWebPage()
self.wb.mainFrame().setScrollBarPolicy(
QtCore.Qt.Horizontal, QtCore.Qt.ScrollBarAlwaysOff)
self.wb.mainFrame().setScrollBarPolicy(
QtCore.Qt.Vertical, QtCore.Qt.ScrollBarAlwaysOff)
self.wb.loadFinished.connect(self.loadFinishedSlot)
self.wb.mainFrame().initialLayoutCompleted.connect(
self.initialLayoutSlot)
logging.debug("Load %s", self.url)
self.wb.mainFrame().load(QtCore.QUrl(self.url))
def doCapture(self):
logging.debug("Beginning capture")
self.wb.setViewportSize(self.wb.mainFrame().contentsSize())
img = QtGui.QImage(self.wb.viewportSize(), QtGui.QImage.Format_ARGB32)
painter = QtGui.QPainter(img)
self.wb.mainFrame().render(painter)
painter.end()
img.save(self.filename)
self.app.quit()
def test():
"""Run a simple capture"""
app = QtGui.QApplication([])
c = Capturer("http://www.google.com", "google.png", app)
c.capture()
logging.debug("About to run exec_")
app.exec_()
DEBUG:root:Load http://www.google.com
QObject::connect: Cannot connect (null)::configurationAdded(QNetworkConfiguration) to QNetworkConfigurationManager::configurationAdded(QNetworkConfiguration)
QObject::connect: Cannot connect (null)::configurationRemoved(QNetworkConfiguration) to QNetworkConfigurationManager::configurationRemoved(QNetworkConfiguration)
QObject::connect: Cannot connect (null)::configurationUpdateComplete() to QNetworkConfigurationManager::updateCompleted()
QObject::connect: Cannot connect (null)::onlineStateChanged(bool) to QNetworkConfigurationManager::onlineStateChanged(bool)
QObject::connect: Cannot connect (null)::configurationChanged(QNetworkConfiguration) to QNetworkConfigurationManager::configurationChanged(QNetworkConfiguration)
Process Python segmentation fault (this last line is comes from emacs)
所以你想通过复制他人的工作来编写代码,而你却不明白你到底在拷贝什么? – dassouki 2011-05-07 23:02:01
当为特定目的专门提供代码时,借用GPL代码来处理小脚本是非常合理的。这与使用库非常相似,只是库不起作用,我试图找出如何解决它。 – 2011-05-07 23:30:13
我跑了它,它工作正常。 (在添加进口后,你遗漏了。) – Nathan 2011-05-08 00:26:27