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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<title>TinyXml: TiXmlHandle Class Reference</title>
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<h1>TiXmlHandle Class Reference</h1><!-- doxytag: class="TiXmlHandle" -->A <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> is a class that wraps a node pointer with null checks; this is an incredibly useful thing.
<a href="#_details">More...</a>
<p>
<code>#include <<a class="el" href="tinyxml_8h-source.html">tinyxml.h</a>></code>
<p>
<a href="classTiXmlHandle-members.html">List of all members.</a><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="ba18fd7bdefb942ecdea4bf4b8e29ec8"></a><!-- doxytag: member="TiXmlHandle::TiXmlHandle" ref="ba18fd7bdefb942ecdea4bf4b8e29ec8" args="(TiXmlNode *_node)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#ba18fd7bdefb942ecdea4bf4b8e29ec8">TiXmlHandle</a> (<a class="el" href="classTiXmlNode.html">TiXmlNode</a> *_node)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Create a handle from any node (at any depth of the tree.) This can be a null pointer. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="236d7855e1e56ccc7b980630c48c7fd7"></a><!-- doxytag: member="TiXmlHandle::TiXmlHandle" ref="236d7855e1e56ccc7b980630c48c7fd7" args="(const TiXmlHandle &ref)" -->
</td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#236d7855e1e56ccc7b980630c48c7fd7">TiXmlHandle</a> (const <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> &ref)</td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Copy constructor. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="cdb1faaf88a700b40ca2c8d9aee21139"></a><!-- doxytag: member="TiXmlHandle::FirstChild" ref="cdb1faaf88a700b40ca2c8d9aee21139" args="() const " -->
<a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#cdb1faaf88a700b40ca2c8d9aee21139">FirstChild</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the first child node. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="8c61f64ae9365d89c264f289085541f8"></a><!-- doxytag: member="TiXmlHandle::FirstChild" ref="8c61f64ae9365d89c264f289085541f8" args="(const char *value) const " -->
<a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#8c61f64ae9365d89c264f289085541f8">FirstChild</a> (const char *value) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the first child node with the given name. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="24d1112e995e937e4dddb202d4113d4a"></a><!-- doxytag: member="TiXmlHandle::FirstChildElement" ref="24d1112e995e937e4dddb202d4113d4a" args="() const " -->
<a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#24d1112e995e937e4dddb202d4113d4a">FirstChildElement</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the first child element. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="f0aea751320f5e430fac6f8fff3b8dd4"></a><!-- doxytag: member="TiXmlHandle::FirstChildElement" ref="f0aea751320f5e430fac6f8fff3b8dd4" args="(const char *value) const " -->
<a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#f0aea751320f5e430fac6f8fff3b8dd4">FirstChildElement</a> (const char *value) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the first child element with the given name. <br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#072492b4be1acdb0db2d03cd8f71ccc4">Child</a> (const char *value, int index) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the "index" child with the given name. <a href="#072492b4be1acdb0db2d03cd8f71ccc4"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#f9cf6a7d08a5da94a8924425ad0cd5ac">Child</a> (int index) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the "index" child. <a href="#f9cf6a7d08a5da94a8924425ad0cd5ac"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#979a3f850984a176ee884e394c7eed2d">ChildElement</a> (const char *value, int index) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the "index" child element with the given name. <a href="#979a3f850984a176ee884e394c7eed2d"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#8786475b9d1f1518492e3a46704c7ef0">ChildElement</a> (int index) const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return a handle to the "index" child element. <a href="#8786475b9d1f1518492e3a46704c7ef0"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlNode.html">TiXmlNode</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#f678e5088e83be67baf76f699756f2c3">ToNode</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the handle as a <a class="el" href="classTiXmlNode.html">TiXmlNode</a>. <a href="#f678e5088e83be67baf76f699756f2c3"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlElement.html">TiXmlElement</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#bc6e7ed383a5fe1e52b0c0004b457b9e">ToElement</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the handle as a <a class="el" href="classTiXmlElement.html">TiXmlElement</a>. <a href="#bc6e7ed383a5fe1e52b0c0004b457b9e"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlText.html">TiXmlText</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#4ac53a652296203a5b5e13854d923586">ToText</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the handle as a <a class="el" href="classTiXmlText.html">TiXmlText</a>. <a href="#4ac53a652296203a5b5e13854d923586"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#1381c17507a130767b1e23afc93b3674">ToUnknown</a> () const </td></tr>
<tr><td class="mdescLeft"> </td><td class="mdescRight">Return the handle as a <a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a>. <a href="#1381c17507a130767b1e23afc93b3674"></a><br></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlNode.html">TiXmlNode</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#b44b723a8dc9af72838a303c079d0376">Node</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlElement.html">TiXmlElement</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#cb5fe8388a526289ea65e817a51e05e7">Element</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlText.html">TiXmlText</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#9fc739c8a18d160006f82572fc143d13">Text</a> () const </td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a> * </td><td class="memItemRight" valign="bottom"><a class="el" href="classTiXmlHandle.html#49675b74357ba2aae124657a9a1ef465">Unknown</a> () const </td></tr>
</table>
<hr><a name="_details"></a><h2>Detailed Description</h2>
A <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> is a class that wraps a node pointer with null checks; this is an incredibly useful thing.
<p>
Note that <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> is not part of the TinyXml DOM structure. It is a separate utility class.<p>
Take an example: <div class="fragment"><pre class="fragment"> <Document>
<Element attributeA = "valueA">
<Child attributeB = "value1" />
<Child attributeB = "value2" />
</Element>
<Document>
</pre></div><p>
Assuming you want the value of "attributeB" in the 2nd "Child" element, it's very easy to write a *lot* of code that looks like:<p>
<div class="fragment"><pre class="fragment"> TiXmlElement* root = document.FirstChildElement( "Document" );
if ( root )
{
TiXmlElement* element = root->FirstChildElement( "Element" );
if ( element )
{
TiXmlElement* child = element->FirstChildElement( "Child" );
if ( child )
{
TiXmlElement* child2 = child->NextSiblingElement( "Child" );
if ( child2 )
{
// Finally do something useful.
</pre></div><p>
And that doesn't even cover "else" cases. <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> addresses the verbosity of such code. A <a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> checks for null pointers so it is perfectly safe and correct to use:<p>
<div class="fragment"><pre class="fragment"> TiXmlHandle docHandle( &document );
TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).ToElement();
if ( child2 )
{
// do something useful
</pre></div><p>
Which is MUCH more concise and useful.<p>
It is also safe to copy handles - internally they are nothing more than node pointers. <div class="fragment"><pre class="fragment"> TiXmlHandle handleCopy = handle;
</pre></div><p>
What they should not be used for is iteration:<p>
<div class="fragment"><pre class="fragment"> int i=0;
while ( true )
{
TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", i ).ToElement();
if ( !child )
break;
// do something
++i;
}
</pre></div><p>
It seems reasonable, but it is in fact two embedded while loops. The Child method is a linear walk to find the element, so this code would iterate much more than it needs to. Instead, prefer:<p>
<div class="fragment"><pre class="fragment"> TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).FirstChild( "Child" ).ToElement();
for( child; child; child=child->NextSiblingElement() )
{
// do something
}
</pre></div>
<p>
<hr><h2>Member Function Documentation</h2>
<a class="anchor" name="f9cf6a7d08a5da94a8924425ad0cd5ac"></a><!-- doxytag: member="TiXmlHandle::Child" ref="f9cf6a7d08a5da94a8924425ad0cd5ac" args="(int index) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> TiXmlHandle::Child </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em> </td>
<td> ) </td>
<td width="100%"> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Return a handle to the "index" child.
<p>
The first child is 0, the second 1, etc.
</div>
</div><p>
<a class="anchor" name="072492b4be1acdb0db2d03cd8f71ccc4"></a><!-- doxytag: member="TiXmlHandle::Child" ref="072492b4be1acdb0db2d03cd8f71ccc4" args="(const char *value, int index) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> TiXmlHandle::Child </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Return a handle to the "index" child with the given name.
<p>
The first child is 0, the second 1, etc.
</div>
</div><p>
<a class="anchor" name="8786475b9d1f1518492e3a46704c7ef0"></a><!-- doxytag: member="TiXmlHandle::ChildElement" ref="8786475b9d1f1518492e3a46704c7ef0" args="(int index) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> TiXmlHandle::ChildElement </td>
<td>(</td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em> </td>
<td> ) </td>
<td width="100%"> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Return a handle to the "index" child element.
<p>
The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
</div>
</div><p>
<a class="anchor" name="979a3f850984a176ee884e394c7eed2d"></a><!-- doxytag: member="TiXmlHandle::ChildElement" ref="979a3f850984a176ee884e394c7eed2d" args="(const char *value, int index) const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlHandle.html">TiXmlHandle</a> TiXmlHandle::ChildElement </td>
<td>(</td>
<td class="paramtype">const char * </td>
<td class="paramname"> <em>value</em>, </td>
</tr>
<tr>
<td class="paramkey"></td>
<td></td>
<td class="paramtype">int </td>
<td class="paramname"> <em>index</em></td><td> </td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td><td></td><td width="100%"> const</td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
Return a handle to the "index" child element with the given name.
<p>
The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
</div>
</div><p>
<a class="anchor" name="cb5fe8388a526289ea65e817a51e05e7"></a><!-- doxytag: member="TiXmlHandle::Element" ref="cb5fe8388a526289ea65e817a51e05e7" args="() const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlElement.html">TiXmlElement</a>* TiXmlHandle::Element </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<dl compact><dt><b><a class="el" href="deprecated.html#_deprecated000002">Deprecated:</a></b></dt><dd>use ToElement. Return the handle as a <a class="el" href="classTiXmlElement.html">TiXmlElement</a>. This may return null. </dd></dl>
</div>
</div><p>
<a class="anchor" name="b44b723a8dc9af72838a303c079d0376"></a><!-- doxytag: member="TiXmlHandle::Node" ref="b44b723a8dc9af72838a303c079d0376" args="() const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlNode.html">TiXmlNode</a>* TiXmlHandle::Node </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<dl compact><dt><b><a class="el" href="deprecated.html#_deprecated000001">Deprecated:</a></b></dt><dd>use ToNode. Return the handle as a <a class="el" href="classTiXmlNode.html">TiXmlNode</a>. This may return null. </dd></dl>
</div>
</div><p>
<a class="anchor" name="9fc739c8a18d160006f82572fc143d13"></a><!-- doxytag: member="TiXmlHandle::Text" ref="9fc739c8a18d160006f82572fc143d13" args="() const " -->
<div class="memitem">
<div class="memproto">
<table class="memname">
<tr>
<td class="memname"><a class="el" href="classTiXmlText.html">TiXmlText</a>* TiXmlHandle::Text </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
</tr>
</table>
</div>
<div class="memdoc">
<p>
<dl compact><dt><b><a class="el" href="deprecated.html#_deprecated000003">Deprecated:</a></b></dt><dd>use <a class="el" href="classTiXmlHandle.html#4ac53a652296203a5b5e13854d923586">ToText()</a> Return the handle as a <a class="el" href="classTiXmlText.html">TiXmlText</a>. This may return null. </dd></dl>
</div>
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<a class="anchor" name="bc6e7ed383a5fe1e52b0c0004b457b9e"></a><!-- doxytag: member="TiXmlHandle::ToElement" ref="bc6e7ed383a5fe1e52b0c0004b457b9e" args="() const " -->
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<td class="memname"><a class="el" href="classTiXmlElement.html">TiXmlElement</a>* TiXmlHandle::ToElement </td>
<td>(</td>
<td class="paramname"> </td>
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<td width="100%"> const<code> [inline]</code></td>
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Return the handle as a <a class="el" href="classTiXmlElement.html">TiXmlElement</a>.
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This may return null.
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<a class="anchor" name="f678e5088e83be67baf76f699756f2c3"></a><!-- doxytag: member="TiXmlHandle::ToNode" ref="f678e5088e83be67baf76f699756f2c3" args="() const " -->
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<td class="memname"><a class="el" href="classTiXmlNode.html">TiXmlNode</a>* TiXmlHandle::ToNode </td>
<td>(</td>
<td class="paramname"> </td>
<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
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Return the handle as a <a class="el" href="classTiXmlNode.html">TiXmlNode</a>.
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This may return null.
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<a class="anchor" name="4ac53a652296203a5b5e13854d923586"></a><!-- doxytag: member="TiXmlHandle::ToText" ref="4ac53a652296203a5b5e13854d923586" args="() const " -->
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<td class="memname"><a class="el" href="classTiXmlText.html">TiXmlText</a>* TiXmlHandle::ToText </td>
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<td> ) </td>
<td width="100%"> const<code> [inline]</code></td>
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Return the handle as a <a class="el" href="classTiXmlText.html">TiXmlText</a>.
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This may return null.
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<a class="anchor" name="1381c17507a130767b1e23afc93b3674"></a><!-- doxytag: member="TiXmlHandle::ToUnknown" ref="1381c17507a130767b1e23afc93b3674" args="() const " -->
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<td class="memname"><a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a>* TiXmlHandle::ToUnknown </td>
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<td width="100%"> const<code> [inline]</code></td>
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Return the handle as a <a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a>.
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This may return null.
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<a class="anchor" name="49675b74357ba2aae124657a9a1ef465"></a><!-- doxytag: member="TiXmlHandle::Unknown" ref="49675b74357ba2aae124657a9a1ef465" args="() const " -->
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<td class="memname"><a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a>* TiXmlHandle::Unknown </td>
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<td width="100%"> const<code> [inline]</code></td>
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<dl compact><dt><b><a class="el" href="deprecated.html#_deprecated000004">Deprecated:</a></b></dt><dd>use <a class="el" href="classTiXmlHandle.html#1381c17507a130767b1e23afc93b3674">ToUnknown()</a> Return the handle as a <a class="el" href="classTiXmlUnknown.html">TiXmlUnknown</a>. This may return null. </dd></dl>
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<hr>The documentation for this class was generated from the following file:<ul>
<li><a class="el" href="tinyxml_8h-source.html">tinyxml.h</a></ul>
<hr size="1"><address style="align: right;"><small>Generated on Sun May 6 15:41:23 2007 for TinyXml by
<a href="http://www.doxygen.org/index.html">
<img src="doxygen.png" alt="doxygen" align="middle" border="0"></a> 1.4.7 </small></address>
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