1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 2<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US"> 3<head> 4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> 5<meta http-equiv="X-UA-Compatible" content="IE=11"/> 6<meta name="generator" content="Doxygen 1.10.0"/> 7<meta name="viewport" content="width=device-width, initial-scale=1"/> 8<title>TinyXML-2: Get information out of XML</title> 9<link href="tabs.css" rel="stylesheet" type="text/css"/> 10<script type="text/javascript" src="jquery.js"></script> 11<script type="text/javascript" src="dynsections.js"></script> 12<script type="text/javascript" src="clipboard.js"></script> 13<script type="text/javascript" src="cookie.js"></script> 14<link href="search/search.css" rel="stylesheet" type="text/css"/> 15<script type="text/javascript" src="search/searchdata.js"></script> 16<script type="text/javascript" src="search/search.js"></script> 17<link href="doxygen.css" rel="stylesheet" type="text/css" /> 18</head> 19<body> 20<div id="top"><!-- do not remove this div, it is closed by doxygen! --> 21<div id="titlearea"> 22<table cellspacing="0" cellpadding="0"> 23 <tbody> 24 <tr id="projectrow"> 25 <td id="projectalign"> 26 <div id="projectname">TinyXML-2<span id="projectnumber"> 10.0.0</span> 27 </div> 28 </td> 29 </tr> 30 </tbody> 31</table> 32</div> 33<!-- end header part --> 34<!-- Generated by Doxygen 1.10.0 --> 35<script type="text/javascript"> 36/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */ 37var searchBox = new SearchBox("searchBox", "search/",'.html'); 38/* @license-end */ 39</script> 40<script type="text/javascript" src="menudata.js"></script> 41<script type="text/javascript" src="menu.js"></script> 42<script type="text/javascript"> 43/* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */ 44$(function() { 45 initMenu('',true,false,'search.php','Search'); 46 $(function() { init_search(); }); 47}); 48/* @license-end */ 49</script> 50<div id="main-nav"></div> 51<!-- window showing the filter options --> 52<div id="MSearchSelectWindow" 53 onmouseover="return searchBox.OnSearchSelectShow()" 54 onmouseout="return searchBox.OnSearchSelectHide()" 55 onkeydown="return searchBox.OnSearchSelectKey(event)"> 56</div> 57 58<!-- iframe showing the search results (closed by default) --> 59<div id="MSearchResultsWindow"> 60<div id="MSearchResults"> 61<div class="SRPage"> 62<div id="SRIndex"> 63<div id="SRResults"></div> 64<div class="SRStatus" id="Loading">Loading...</div> 65<div class="SRStatus" id="Searching">Searching...</div> 66<div class="SRStatus" id="NoMatches">No Matches</div> 67</div> 68</div> 69</div> 70</div> 71 72</div><!-- top --> 73<div><div class="header"> 74 <div class="headertitle"><div class="title">Get information out of XML</div></div> 75</div><!--header--> 76<div class="contents"> 77<div class="textblock"><p> In this example, we navigate a simple XML file, and read some interesting text. Note that this example doesn't use error checking; working code should check for null pointers when walking an XML tree, or use XMLHandle.</p> 78<p>(The XML is an excerpt from "dream.xml").</p> 79<div class="fragment"><div class="line"><span class="keywordtype">int</span> example_3()</div> 80<div class="line">{</div> 81<div class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* xml =</div> 82<div class="line"> <span class="stringliteral">"<?xml version=\"1.0\"?>"</span></div> 83<div class="line"> <span class="stringliteral">"<!DOCTYPE PLAY SYSTEM \"play.dtd\">"</span></div> 84<div class="line"> <span class="stringliteral">"<PLAY>"</span></div> 85<div class="line"> <span class="stringliteral">"<TITLE>A Midsummer Night's Dream</TITLE>"</span></div> 86<div class="line"> <span class="stringliteral">"</PLAY>"</span>;</div> 87</div><!-- fragment --><p> The structure of the XML file is:</p> 88<ul> 89<li> 90(declaration) </li> 91<li> 92(dtd stuff) </li> 93<li> 94Element "PLAY" <ul> 95<li> 96Element "TITLE" <ul> 97<li> 98Text "A Midsummer Night's Dream" </li> 99</ul> 100</li> 101</ul> 102</li> 103</ul> 104<p>For this example, we want to print out the title of the play. The text of the title (what we want) is child of the "TITLE" element which is a child of the "PLAY" element.</p> 105<p>We want to skip the declaration and dtd, so the method FirstChildElement() is a good choice. The FirstChildElement() of the Document is the "PLAY" Element, the FirstChildElement() of the "PLAY" Element is the "TITLE" Element.</p> 106<div class="fragment"><div class="line"> </div> 107<div class="line"> XMLDocument doc;</div> 108<div class="line"> doc.Parse( xml );</div> 109<div class="line"> </div> 110<div class="line"> XMLElement* titleElement = doc.FirstChildElement( <span class="stringliteral">"PLAY"</span> )->FirstChildElement( <span class="stringliteral">"TITLE"</span> );</div> 111</div><!-- fragment --><p> We can then use the convenience function GetText() to get the title of the play.</p> 112<div class="fragment"><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span>* title = titleElement->GetText();</div> 113<div class="line"> printf( <span class="stringliteral">"Name of play (1): %s\n"</span>, title );</div> 114</div><!-- fragment --><p> Text is just another Node in the XML DOM. And in fact you should be a little cautious with it, as text nodes can contain elements.</p> 115<pre class="fragment">Consider: A Midsummer Night's <b>Dream</b> 116</pre><p>It is more correct to actually query the Text Node if in doubt:</p> 117<div class="fragment"><div class="line"> </div> 118<div class="line"> XMLText* textNode = titleElement->FirstChild()->ToText();</div> 119<div class="line"> title = textNode->Value();</div> 120<div class="line"> printf( <span class="stringliteral">"Name of play (2): %s\n"</span>, title );</div> 121</div><!-- fragment --><p> Noting that here we use FirstChild() since we are looking for XMLText, not an element, and ToText() is a cast from a Node to a XMLText. </p> 122</div></div><!-- contents --> 123</div><!-- PageDoc --> 124<!-- start footer part --> 125<hr class="footer"/><address class="footer"><small> 126Generated on Sat Dec 30 2023 18:02:35 for TinyXML-2 by <a href="https://www.doxygen.org/index.html"><img class="footer" src="doxygen.svg" width="104" height="31" alt="doxygen"/></a> 1.10.0 127</small></address> 128</body> 129</html> 130
