[SOLVED]How to parse html in qt
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wrote on 3 Jul 2013, 12:01 last edited by
As the title said, in QT GUI application.
should i use regex?
if yes how i can use this in qt regex?
@<div\sclass="result-box">(.*)</div></div><div\sclass="ad-page-S1"\sid="DA_03-0-4"></div>@ -
depending on the use case regular expressions are sub-optimal for parsing html.
What information do you exactly want? Propably the best would be to load the file using QWebPage and get the contents of it using the QWebElement API.Also you can read "this":http://qt-project.org/wiki/Handling_HTML.
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wrote on 3 Jul 2013, 12:54 last edited by
i have added webkitwidgets in pro file.
#include <QWebElement>
#include <QWebFrame>
in mainwindow.cpp file
if i try the following
@
QWebFrame *frame;
frame->setHtml("<html></html>");
QWebElement parse = frame->documentElement();
@its will crash:The program has unexpectedly finished.
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and what happens when you use QWebPage instead of QWebFrame (as is said)?
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wrote on 3 Jul 2013, 13:06 last edited by
Same thing
[quote author="raven-worx" date="1372856223"]and what happens when you use QWebPage instead of QWebFrame (as is said)?[/quote]@#include <QWebPage>
QString source(reply->readAll());
QWebPage *page;
page->mainFrame()->setHtml(source);@The program has unexpectedly finished.
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-can you run your application in your IDE and in debug mode and post the stack trace of the crash.-
nvm...do this please:
@
QWebPage *page = new QWebPage;
page->mainFrame()->setHtml(source);
@
or this
@
QWebPage page;
page.mainFrame()->setHtml(source);
@ -
wrote on 3 Jul 2013, 13:42 last edited by
2nd one works.
@ QString source(reply->readAll());
QWebPage page;
page.mainFrame()->setHtml(source);
QWebElement parse = page.mainFrame()->documentElement();
QWebElement result = parse.findFirst("div[class=result-box]");
ui->plainTextEdit->setPlainText(result.toPlainText());@
the last line cause crash
!http://s16.postimg.org/6dgypgt9h/Screenshot_from_2013_07_03_16_40_27.png(1)!
!http://s22.postimg.org/j4qwk68wx/Screenshot_from_2013_07_03_16_41_36.png(2)! -
when working with QWebElement it's good practice to check if the element is null: QWebElement::isNull() ... please check that.
This happens when the search was unsuccessful for example. -
wrote on 3 Jul 2013, 13:54 last edited by
@QMessageBox::information(this, "T", QString::number(result.isNull()));@
this breaks the code too -
i just tried your code and it is working for me.
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wrote on 3 Jul 2013, 14:19 last edited by
i tried to put <html></html> and its worked, i think the html source i got who make the crash?
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seems so...maybe this is a bug in the Qt implementation.
maybe you can find out what exactly causes the crash? You got the full source code from the network reply. You can save the string and use it for testing which part exactly causes the crash.Did you also try loading another url? Does it only occur on a specific webpage?
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wrote on 3 Jul 2013, 14:24 last edited by
i have downloaded the latest release qt 5.1.0 and the crash stopped.
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wrote on 4 Jul 2013, 22:26 last edited by
thanks for your helping.
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