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<title>Demonstration of SAX2 features</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Demonstration of SAX2 features</h1>

 
<p> 
<p> This example presents a small <a href="xml.html#sax2">SAX2</a>
reader that outputs the qualified names and the
respective namespace URIs of all elements and attributes in an
XML file. Additionally the tree structure of the document is displayed.
<p> In three listviews the program shows the different output of the reader
depending on how the SAX2 <a href="xml.html#sax2Namespaces">features</a>
<em>http://xml.org/sax/features/namespaces</em> and
<em>http://xml.org/sax/features/namespace-prefixes</em> are set.
<p> This example is thoroughly explained in a 
<a href="xml-sax-features-walkthrough.html">walkthrough.</a>
<p> <hr>
<p> Header file:
<p> <pre>/*
$Id$
*/

#ifndef STRUCTUREPARSER_H
#define STRUCTUREPARSER_H

#include &lt;<a href="qxml-h.html">qxml.h</a>&gt;
#include &lt;<a href="qptrstack-h.html">qptrstack.h</a>&gt;

class QListView;
class QListViewItem;
class QString;

class StructureParser: public <a href="qxmldefaulthandler.html">QXmlDefaultHandler</a>
{
public:
    StructureParser( <a href="qlistview.html">QListView</a> * );
    bool startElement( const <a href="qstring.html">QString</a>&amp;, const <a href="qstring.html">QString</a>&amp;, const <a href="qstring.html">QString</a>&amp; ,
                       const <a href="qxmlattributes.html">QXmlAttributes</a>&amp; );
    bool endElement( const <a href="qstring.html">QString</a>&amp;, const <a href="qstring.html">QString</a>&amp;, const <a href="qstring.html">QString</a>&amp; );

    void setListView( <a href="qlistview.html">QListView</a> * );

private:
    <a href="qptrstack.html">QPtrStack</a>&lt;QListViewItem&gt; stack;
    <a href="qlistview.html">QListView</a> * table;
};

#endif
</pre>

<p> <hr>
<p> Implementation:
<p> <pre>/*
$Id$
*/

#include "structureparser.h"

#include &lt;<a href="qstring-h.html">qstring.h</a>&gt;
#include &lt;<a href="qlistview-h.html">qlistview.h</a>&gt;

<a name="f148"></a>StructureParser::StructureParser( <a href="qlistview.html">QListView</a> * t )
                : <a href="qxmldefaulthandler.html">QXmlDefaultHandler</a>()
{
    setListView( t );
}

void <a name="f149"></a>StructureParser::setListView( <a href="qlistview.html">QListView</a> * t )
{
    table = t;
    table-&gt;setSorting( -1 );
    table-&gt;addColumn( "Qualified name" );
    table-&gt;addColumn( "Namespace" );
}

<a name="x43"></a>bool StructureParser::<a href="qxmlcontenthandler.html#startElement">startElement</a>( const <a href="qstring.html">QString</a>&amp; namespaceURI,
                                    const <a href="qstring.html">QString</a>&amp; ,
                                    const <a href="qstring.html">QString</a>&amp; qName,
                                    const <a href="qxmlattributes.html">QXmlAttributes</a>&amp; attributes)
{
    <a href="qlistviewitem.html">QListViewItem</a> * element;

    if ( ! stack.isEmpty() ){
        element = new <a href="qlistviewitem.html">QListViewItem</a>( stack.top(), qName, namespaceURI );
    } else {
        element = new <a href="qlistviewitem.html">QListViewItem</a>( table, qName, namespaceURI );
    }
    stack.push( element );
<a name="x38"></a>    element-&gt;<a href="qlistviewitem.html#setOpen">setOpen</a>( TRUE );

<a name="x39"></a>    if ( attributes.<a href="qxmlattributes.html#length">length</a>() &gt; 0 ) {
        for ( int i = 0 ; i &lt; attributes.<a href="qxmlattributes.html#length">length</a>(); i++ ) {
<a name="x41"></a><a name="x40"></a>            new <a href="qlistviewitem.html">QListViewItem</a>( element, attributes.<a href="qxmlattributes.html#qName">qName</a>(i), attributes.<a href="qxmlattributes.html#uri">uri</a>(i) );
        }
    }
    return TRUE;
}

<a name="x42"></a>bool StructureParser::<a href="qxmlcontenthandler.html#endElement">endElement</a>( const <a href="qstring.html">QString</a>&amp;, const <a href="qstring.html">QString</a>&amp;,
                                  const <a href="qstring.html">QString</a>&amp; )
{
    stack.pop();
    return TRUE;
}
</pre>

<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id:  qt/tagreader.cpp   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 2001 Trolltech AS.  All rights reserved.
**
** This file is part of an example program for Qt.  This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/

#include "structureparser.h"
#include &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;
#include &lt;<a href="qfile-h.html">qfile.h</a>&gt;
#include &lt;<a href="qxml-h.html">qxml.h</a>&gt;
#include &lt;<a href="qlistview-h.html">qlistview.h</a>&gt;
#include &lt;<a href="qgrid-h.html">qgrid.h</a>&gt;
#include &lt;<a href="qmainwindow-h.html">qmainwindow.h</a>&gt;
#include &lt;<a href="qlabel-h.html">qlabel.h</a>&gt;

int main( int argc, char **argv )
{
    <a href="qapplication.html">QApplication</a> app( argc, argv );

    <a href="qfile.html">QFile</a> xmlFile( argc == 2 ? argv[1] : "fnord.xml" );
    <a href="qxmlinputsource.html">QXmlInputSource</a> source( &amp;xmlFile );

    <a href="qxmlsimplereader.html">QXmlSimpleReader</a> reader;

    <a href="qgrid.html">QGrid</a> * container = new <a href="qgrid.html">QGrid</a>( 3 );

    <a href="qlistview.html">QListView</a> * nameSpace = new <a href="qlistview.html">QListView</a>( container, "table_namespace" );
    StructureParser * handler = new StructureParser( nameSpace );
<a name="x49"></a>    reader.<a href="qxmlreader.html#setContentHandler">setContentHandler</a>( handler );
<a name="x48"></a>    reader.<a href="qxmlsimplereader.html#parse">parse</a>( source );

    <a href="qlistview.html">QListView</a> * namespacePrefix = new <a href="qlistview.html">QListView</a>( container,
                                                 "table_namespace_prefix" );
    handler-&gt;setListView( namespacePrefix );
<a name="x50"></a>    reader.<a href="qxmlreader.html#setFeature">setFeature</a>( "http://xml.org/sax/features/namespace-prefixes",
                       TRUE );
<a name="x47"></a>    source.<a href="qxmlinputsource.html#reset">reset</a>();
    reader.<a href="qxmlsimplereader.html#parse">parse</a>( source );

    <a href="qlistview.html">QListView</a> * prefix = new <a href="qlistview.html">QListView</a>( container, "table_prefix");
    handler-&gt;setListView( prefix );
    reader.<a href="qxmlreader.html#setFeature">setFeature</a>( "http://xml.org/sax/features/namespaces", FALSE );
    source.<a href="qxmlinputsource.html#reset">reset</a>();
    reader.<a href="qxmlsimplereader.html#parse">parse</a>( source );

    // namespace label
    (void) new <a href="qlabel.html">QLabel</a>(
             "Default:\n"
             "http://xml.org/sax/features/namespaces: TRUE\n"
             "http://xml.org/sax/features/namespace-prefixes: FALSE\n",
             container );

    // namespace prefix label
    (void) new <a href="qlabel.html">QLabel</a>(
             "\n"
             "http://xml.org/sax/features/namespaces: TRUE\n"
             "http://xml.org/sax/features/namespace-prefixes: TRUE\n",
             container );

    // prefix label
    (void) new <a href="qlabel.html">QLabel</a>(
             "\n"
             "http://xml.org/sax/features/namespaces: FALSE\n"
             "http://xml.org/sax/features/namespace-prefixes: TRUE\n",
             container );


    app.<a href="qapplication.html#setMainWidget">setMainWidget</a>( container );
    container-&gt;<a href="qwidget.html#show">show</a>();
    return app.<a href="qapplication.html#exec">exec</a>();
}
</pre>

<p>See also <a href="xml-examples.html">Qt XML Examples</a>.

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