Revision as of 15:52, 29 October 2006

For HTML parsing, you have the following possibilities:

QXML
QDOM
perl
khtml

Obviously, QXML and QDOM need xml-compliant html pages, and the least html pages are xml-compliant. Perl is not the scope of this site. So, this tutorial choses the khtml approach.

First step

Our first khtml-program does plain nothing: <highlightSyntax language="cpp">

include <qstring.h>
include <kapplication.h>
include <kaboutdata.h>
include <kmessagebox.h>
include <kcmdlineargs.h>
include <dom/html_document.h>

int main (int argc, char *argv[]) {

       KAboutData aboutData( "test", "test",
       "1.0", "test", KAboutData::License_GPL,
       "(c) 2006" );
       KCmdLineArgs::init( argc, argv, &aboutData );
       KApplication khello;
       DOM::HTMLDocument();

} </highlightSyntax> It can be compiled like:

gcc -I/usr/lib/qt3/include -I/opt/kde3/include \
-L/opt/kde3/lib -lkdeui -lkhtml -o khtml khtml.cpp

Showing tags

The next program is more advanced, it shows you the first tags of an html file: <highlightSyntax language="cpp">

include <kapplication.h>
include <kaboutdata.h>
include <kcmdlineargs.h>
include <dom/html_document.h>

int main (int argc, char *argv[]) {

 KAboutData aboutData( "test", "test",
 "1.0", "test", KAboutData::License_GPL,
 "(c) 2006" );
 KCmdLineArgs::init( argc, argv, &aboutData );
 KApplication khello;

 DOM::Document doc=DOM::Document();
 DOM::HTMLDocument htmldoc=DOM::HTMLDocument();
 DOM::DOMString tag("*");
 doc.loadXML("hello.htm");
 kdDebug() << "Does this doc have child elements ? " << doc.hasChildNodes() << endl;
 kdDebug() << "First child node name: " << doc.firstChild().nodeName().string() << endl;
 kdDebug() << "First grandchild node name: " << doc.firstChild().firstChild().nodeName().string() << endl;
 kdDebug() << "Count of elements in your doc " << doc.getElementsByTagName(tag).length()<< endl;
 kdDebug() << "Size of your doc " << sizeof(doc) << endl;
 kdDebug() << doc.toString().string() << endl;

} </highlightSyntax> You can use this e.g. with the following hello.htm:

<html>
<head>
<title>blah</title>
</head>
<body>
<b>fat</b>
<a href="http://www.de">denic</a>
</body>
</html>

You get an error because your file is not UTF-16 encoded. Here's how I proceed:

scorpio:~/html # hexdump hello.htm
0000000 3c00 000a
0000003