Development/Tutorials/Programming Tutorial KDE 3/KHTML: Difference between revisions
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Latest revision as of 20:54, 29 June 2011
For HTML parsing, you have the following possibilities:
- QXML
- QDOM
- Perl
- XHTML
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. This tutorial chooses the XHTML approach.
First step
As we remember from http://developernew.kde.org/Development/Tutorials/Programming_Tutorial_KDE_4/How_to_write_an_HTML_parser, biggest thing is to be able to parse non-XML-conform syntax. It works with the following program.
tags.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::HTMLDocument doc;
DOM::DOMString tag("*");
DOM::DOMString uri("<html><body><a href=\"http://www.kde.org/\"></a><a href=\"/index.php\" nowrap>Log in</a><a href=\"http://www.gmx.de\"></a></body></html>");
doc.loadXML(uri);
kdDebug() << "Does this doc have child elements ? " << doc.hasChildNodes() << endl;
for (int i=0; i<doc.getElementsByTagName(tag).length(); i++) kdDebug() << doc.getElementsByTagName(tag).item(i).nodeName().string() << endl;
kdDebug() << "Size of your doc " << sizeof(doc.firstChild()) << endl;
kdDebug() << doc.isHTMLDocument() << endl;
kdDebug() << doc.toString().string() << endl;
}
Compile it like this:
gcc -I/usr/lib/qt3/include -I/opt/kde3/include \ -L/opt/kde3/lib -lkdeui -lkhtml -o tags tags.cpp
Second
#include <kapplication.h>
#include <kaboutdata.h>
#include <kcmdlineargs.h>
#include <dom/html_document.h>
#include <dom/html_element.h>
#include <dom/dom_node.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 doc;
DOM::DOMString tag("*");
DOM::DOMString uri("<html><body><a href=\"http://www.kde.org/\"><b>fat</b></a><a href=\"/index.php\" nowrap>Log in</a><a href=\"http://www.gmx.de\"></a></body></html>");
doc.loadXML(uri);
kdDebug() << "Here's a list of the document elements" << endl;
for (int i=0; i<doc.getElementsByTagName(tag).length(); i++) kdDebug() << doc.getElementsByTagName(tag).item(i).nodeName().string() << endl;
DOM::HTMLDocument doc2;
DOM::DOMString uri2("<html><body>this is html<b>fat</b></body></html>");
doc2.loadXML(uri2);
kdDebug() << "This is the in-memory html:" << endl;
kdDebug() << doc.toString().string() << endl;
doc.body().insertBefore(doc.body().firstChild().firstChild(),doc.body().firstChild());
kdDebug() << "Moving around nodes" << endl;
kdDebug() << doc.toString().string() << endl;
}