Html parser

satyanarayana143

Hi friends,

I want to parse html file in Qt anybody give example or solution .

JohanSolo

A simple search on the forums gives this.
What do you want to achieve? Your question is pretty vague...

JonB

@satyanarayana143
I doubt you will find any robust, complete HTML parser for Qt. As @JohanSolo says, it would be better to describe just what you need to achieve, and why.

satyanarayana143

@JonB

i want get href values in html files in qt

SGaist

Hi,

If it's only to get the URL contained in the href attribute then using a regex like href="(.*)" with QRegularExpression should do the job.

satyanarayana143

@SGaist said in Html parser:

href="(.*)"

can you give some example how to extract href with regex

<html>
<head><title>Index of /satfiles/</title></head>
<body bgcolor="white">
<h1>Index of /satfiles/</h1><hr><pre><a href="../">../</a>
<a href="test1.txt">test1.txt</a> 28-Oct-2018 08:08 14
<a href="test2.txt">test2.txt</a> 28-Oct-2018 08:09 13
<a href="yazmifiletest.ts">yazmifiletest.ts</a> 28-Oct-2018 08:09 30
</pre><hr></body>
</html>

jsulm

@satyanarayana143 http://doc.qt.io/qt-5/qregularexpression.html

mrjj

Hi
Something like

QString html = R"(
        <html>
        <head><title>Index of /satfiles/</title></head>
        <body bgcolor="white">
        <h1>Index of /satfiles/</h1><hr><pre><a href="../">../</a>
        <a href="test1.txt">test1.txt</a> 28-Oct-2018 08:08 14
        <a href="test2.txt">test2.txt</a> 28-Oct-2018 08:09 13
        <a href="yazmifiletest.ts">yazmifiletest.ts</a> 28-Oct-2018 08:09 30
        </pre><hr></body>
        </html>)";

QString regex = R"(href="([^"]*))";
----
 QRegularExpression re(regex);
  QRegularExpressionMatchIterator i = re.globalMatch(html);
  while (i.hasNext()) {
    QRegularExpressionMatch match = i.next();
    qDebug().noquote() << match.captured();
  }

Gets you

href="../
href="test1.txt
href="test2.txt
href="yazmifiletest.ts

you can use
https://regexr.com/
to tweak the expression to match exactly.

koahnig

@satyanarayana143

Try out with the QRegularExpression example

In contrast to the single line version of the QRegExp example you can test short text sections.

satyanarayana143

@mrjj

thakk you for giving solution i want like this only i have solved my problem.

ManiRon

@mrjj said in Html parser:

R

sir in this what does R mean for in the QString html

aha_1980

@ManiRon: https://solarianprogrammer.com/2011/10/16/cpp-11-raw-strings-literals-tutorial

ManiRon

@aha_1980 said in Html parser:

https://solarianprogrammer.com/2011/10/16/cpp-11-raw-strings-literals-tutorial

error: 'R' was not declared in this scope
QString qHtml = R"(<button type="button">Click Me!</button>)";
^

mrjj

@ManiRon
Hi
Code seems fine - so it must be compiler version.

Is it an older Qt / Compiler ?

Its a c++ 11 feature with R (raw strings)

ManiRon

@mrjj its Qt 5.5

mrjj

@ManiRon
Hi
Can you try to add
CONFIG += c++11
in your .pro file
then run qmake and rebuild all (from menu) and see if it accepts it then.

ManiRon

@mrjj said in Html parser:

CONFIG += c++11

i will check and say sir

ManiRon

@mrjj

It worked sir
But i am trying to create a button as you can see in the previous code its just displaying the text click me and not the button in the HTML file
I know that in the list of attribute supported by QT <button> tag is not there whether we can make QT to make work on this

mrjj

@ManiRon
Hi
Super. so was just c+11 support.
The QT widgets cannot draw html Buttons so if you
view them in textEdit/Browser no buttons can be shown.

I know no easy way to have buttons, but you can try with
Qt WebEngine
instead and see if it likes it.

ManiRon

@mrjj as i have not worked on it any sample will be available for Qtwebengine which can be help full to understand it