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POpyqt4 seg fault sequential app start stop
 

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  1. POpyqt4 seg fault sequential app start stop
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    <p>I'm trying to read webpages using pyqt. I need to call a method multiple times with different URLs. I am currently using code similar to: <a href="http://blog.sitescraper.net/2010/06/scraping-javascript-webpages-in-python.html#comment-form" rel="nofollow">http://blog.sitescraper.net/2010/06/scraping-javascript-webpages-in-python.html#comment-form</a></p> <p>However when I try I get seg faults. Any suggestions welcome.</p> <pre><code>import sys from time import clock from PyQt4.QtGui import * from PyQt4.QtCore import * from PyQt4.QtWebKit import * from PyQt4.QtNetwork import * class Render(QWebPage): def __init__(self): self.app = QApplication(sys.argv) QWebPage.__init__(self) self.networkAccessManager().finished.connect(self.handleEnd) self.loadFinished.connect(self._loadFinished) self.mainFrame().setScrollBarPolicy(Qt.Horizontal, Qt.ScrollBarAlwaysOff) self.mainFrame().setScrollBarPolicy(Qt.Vertical, Qt.ScrollBarAlwaysOff) def loadURL(self, url): self.mainFrame().load(QUrl(url)) self.app.exec_() def savePageImage (self, width, height, Imagefile): pageSize = self.mainFrame().contentsSize(); if width == 0: pageWidth = pageSize.width() else: pageWidth = width if height == 0: pageHeight = pageSize.height() else: pageHeight = height self.setViewportSize(QSize(pageWidth, pageHeight)) Img = QImage(self.viewportSize(), QImage.Format_ARGB32) painter = QPainter(Img) self.mainFrame().render(painter) painter.end() Img.save(Imagefile) def _loadFinished(self, result): print "load finish" self.frame = self.mainFrame() self.returnVal = result self.app.quit() def handleEnd (self, reply): # get first http code and disconnect # could add filter to listen relevant responses self.httpcode = reply.attribute(QNetworkRequest.HttpStatusCodeAttribute) self.networkAccessManager().finished.disconnect(self.handleEnd) jsrurl = 'http://www.w3resource.com/javascript/document-alert-confirm/four.html' badurl='something.or.other' badhttp = 'http://eclecticself.com/test2.html' testurl = 'http://www.nydailynews.com/entertainment/index.html' testurl2 = 'http://www.palmbeachpost.com/' testurl3 = 'http://www.nydailynews.com/news/politics/2011/08/03/2011-08-03_pat_buchanan_downplays_controversy_after_calling_president_obama_your_boy_to_rev.html' url = testurl start = clock() r = Render() r.loadURL(url) html = r.frame.toHtml() elapsed = clock() - start print elapsed if (r.returnVal == True): if (r.httpcode.toInt()[0] != 404): #print html.toUtf8() start = clock() r.savePageImage(1024, 0, "pageSnapshot.png") elapsed = clock() - start print elapsed else: print 'page not found' else: print 'badurl' s = Render() s.loadURL(jsrurl) html = s.frame.toHtml() elapsed = clock() - start print elapsed if (s.returnVal == True): if (s.httpcode.toInt()[0] != 404): print html.toUtf8() start = clock() s.savePageImage(1024, 0, "pageSnapshot.png") elapsed = clock() - start print elapsed else: print 'page not found' else: print 'badurl' </code></pre>
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    1. COPut print statements everywhere and find out where did you actually get segfault. I'm suspecting of initializing QApplication.
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    2. COHave you tried debugging?
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    3. COyes, can't find any reason why.
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