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<title>A tiny SAX2 parser</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>A tiny SAX2 parser</h1>

 
<p> 
<p> This example presents a small <a href="xml.html#sax2">SAX2</a>
reader that outputs the names of all elements in an
XML document on the command line. The element names are 
indented corresponding to their nesting
<p> This example is thoroughly explained in a 
<a href="xml-sax-walkthrough.html">walkthrough.</a>
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id:  qt/structureparser.h   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 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.
**
*****************************************************************************/

#ifndef STRUCTUREPARSER_H
#define STRUCTUREPARSER_H

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

class QString;

class StructureParser : public <a href="qxmldefaulthandler.html">QXmlDefaultHandler</a>
{
public:
    bool startDocument();
    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; );

private:
    <a href="qstring.html">QString</a> indent;
};

#endif
</pre>

<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id:  qt/structureparser.cpp   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 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;stdio.h&gt;
#include &lt;<a href="qstring-h.html">qstring.h</a>&gt;

<a name="x52"></a>bool StructureParser::<a href="qxmlcontenthandler.html#startDocument">startDocument</a>()
{
    indent = "";
    return TRUE;
}

<a name="x53"></a>bool StructureParser::<a href="qxmlcontenthandler.html#startElement">startElement</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; qName,
                                    const <a href="qxmlattributes.html">QXmlAttributes</a>&amp; )
{
    printf( "%s%s\n", (const char*)indent, (const char*)qName );
    indent += "    ";
    return TRUE;
}

<a name="x51"></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; )
{
    indent.remove( 0, 4 );
    return TRUE;
}
</pre>

<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id:  qt/tagreader.cpp   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 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="qfile-h.html">qfile.h</a>&gt;
#include &lt;<a href="qxml-h.html">qxml.h</a>&gt;
#include &lt;<a href="qwindowdefs-h.html">qwindowdefs.h</a>&gt;

int main( int argc, char **argv )
{
    if ( argc &lt; 2 ) {
        fprintf( stderr, "Usage: %s &lt;xmlfile&gt;\n", argv[0] );
        return 1;
    }
    for ( int i=1; i &lt; argc; i++ ) {
        StructureParser handler;
        <a href="qfile.html">QFile</a> xmlFile( argv[i] );
        <a href="qxmlinputsource.html">QXmlInputSource</a> source( &amp;xmlFile );
        <a href="qxmlsimplereader.html">QXmlSimpleReader</a> reader;
<a name="x55"></a>        reader.<a href="qxmlreader.html#setContentHandler">setContentHandler</a>( &amp;handler );
<a name="x54"></a>        reader.<a href="qxmlsimplereader.html#parse">parse</a>( source );
    }
    return 0;
}
</pre>

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

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