I get a few signals loadFinishedwhen I try to download QWebPage, and I'm not sure what causes the problem. There were a few more questions that seemed to refer to the same problem, but the solutions didn't work for me:
In the first question, the answer was to connect the signals to the slots only once, "but I already do it. The answer to the second question suggests that I should connect to the frame signal loadFinished, but I just don’t know if I need to get the necessary data when it will be done.
I am trying to load multiple pages:
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QList<QUrl> urls;
urls.append(QUrl("http://www.useragentstring.com/pages/Chrome/"));
urls.append(QUrl("http://www.useragentstring.com/pages/Firefox/"));
urls.append(QUrl("http://www.useragentstring.com/pages/Opera/"));
urls.append(QUrl("http://www.useragentstring.com/pages/Internet Explorer/"));
urls.append(QUrl("http://www.useragentstring.com/pages/Safari/"));
foreach(QUrl url, urls)
{
UA* ua = new UA();
QWebPage* page = new QWebPage();
QObject::connect(page->mainFrame(), SIGNAL(loadFinished(bool)), ua, SLOT(frameLoadFinished(bool)));
page->mainFrame()->load(url);
}
return app.exec();
}
The class that processes the signals looks like this:
class UA:public QObject
{
Q_OBJECT
private:
int _numPageLoadSignals;
int _numFrameLoadSignals
public:
UA()
{
_numPageLoadSignals = 0;
_numFrameLoadSignals = 0;
}
~UA(){}
public slots:
void pageLoadFinished(bool ok)
{
_numPageLoadSignals++;
QWebPage * page = qobject_cast<QWebPage *>(sender());
if(ok && page)
{
qDebug() << _numPageLoadSignals << " loads "
<< page->mainFrame()->documentElement().findAll("div#liste ul li a").count()
<< " elements found on: " << page->mainFrame()->requestedUrl().toString();
}
}
void frameLoadFinished(bool ok)
{
_numFrameLoadSignals++;
QWebFrame * frame = qobject_cast<QWebFrame *>(sender());
if(ok && frame)
{
qDebug() << _numFrameLoadSignals << " loads "
<< frame->documentElement().findAll("div#liste ul li a").count()
<< " elements found on: " << frame->requestedUrl().toString();
}
}
};
loadFinished:
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Safari/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Chrome/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Opera/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Firefox/"
1 loads 241 elements found on: "http://www.useragentstring.com/pages/Internet Explorer/"
, loadFinished:
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Safari/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Chrome/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Firefox/"
1 loads 0 elements found on: "http://www.useragentstring.com/pages/Internet Explorer/"
2 loads 576 elements found on: "http://www.useragentstring.com/pages/Safari/"
2 loads 782 elements found on: "http://www.useragentstring.com/pages/Chrome/"
2 loads 241 elements found on: "http://www.useragentstring.com/pages/Internet Explorer/"
2 loads 1946 elements found on: "http://www.useragentstring.com/pages/Firefox/"
3 loads 241 elements found on: "http://www.useragentstring.com/pages/Internet Explorer/"
3 loads 1946 elements found on: "http://www.useragentstring.com/pages/Firefox/"
3 loads 782 elements found on: "http://www.useragentstring.com/pages/Chrome/"
1 loads 964 elements found on: "http://www.useragentstring.com/pages/Opera/"
3 loads 576 elements found on: "http://www.useragentstring.com/pages/Safari/"
, , - . loadFinished, , , . , ?
Update
, 3 , : UA::loadFinished 3 loadFinished QWebPage. , .