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"> 3<head> 4<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> 5<meta http-equiv="X-UA-Compatible" content="IE=9"/> 6<meta name="generator" content="Doxygen 1.9.1"/> 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<link href="search/search.css" rel="stylesheet" type="text/css"/> 13<script type="text/javascript" src="search/searchdata.js"></script> 14<script type="text/javascript" src="search/search.js"></script> 15<link href="doxygen.css" rel="stylesheet" type="text/css" /> 16</head> 17<body> 18<div id="top"><!-- do not remove this div, it is closed by doxygen! --> 19<div id="titlearea"> 20<table cellspacing="0" cellpadding="0"> 21 <tbody> 22 <tr style="height: 56px;"> 23 <td id="projectalign" style="padding-left: 0.5em;"> 24 <div id="projectname">TinyXML-2 25  <span id="projectnumber">9.0.0</span> 26 </div> 27 </td> 28 </tr> 29 </tbody> 30</table> 31</div> 32<!-- end header part --> 33<!-- Generated by Doxygen 1.9.1 --> 34<script type="text/javascript"> 35/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ 36var searchBox = new SearchBox("searchBox", "search",false,'Search','.html'); 37/* @license-end */ 38</script> 39<script type="text/javascript" src="menudata.js"></script> 40<script type="text/javascript" src="menu.js"></script> 41<script type="text/javascript"> 42/* @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2 */ 43$(function() { 44 initMenu('',true,false,'search.php','Search'); 45 $(document).ready(function() { init_search(); }); 46}); 47/* @license-end */</script> 48<div id="main-nav"></div> 49<!-- window showing the filter options --> 50<div id="MSearchSelectWindow" 51 onmouseover="return searchBox.OnSearchSelectShow()" 52 onmouseout="return searchBox.OnSearchSelectHide()" 53 onkeydown="return searchBox.OnSearchSelectKey(event)"> 54</div> 55 56<!-- iframe showing the search results (closed by default) --> 57<div id="MSearchResultsWindow"> 58<iframe src="javascript:void(0)" frameborder="0" 59 name="MSearchResults" id="MSearchResults"> 60</iframe> 61</div> 62 63</div><!-- top --> 64<div class="PageDoc"><div class="header"> 65 <div class="headertitle"> 66<div class="title">Get information out of XML </div> </div> 67</div><!--header--> 68<div class="contents"> 69<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> 70<p>(The XML is an excerpt from "dream.xml").</p> 71<div class="fragment"><div class="line"><span class="keywordtype">int</span> example_3()</div> 72<div class="line">{</div> 73<div class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* xml =</div> 74<div class="line"> <span class="stringliteral">"<?xml version=\"1.0\"?>"</span></div> 75<div class="line"> <span class="stringliteral">"<!DOCTYPE PLAY SYSTEM \"play.dtd\">"</span></div> 76<div class="line"> <span class="stringliteral">"<PLAY>"</span></div> 77<div class="line"> <span class="stringliteral">"<TITLE>A Midsummer Night's Dream</TITLE>"</span></div> 78<div class="line"> <span class="stringliteral">"</PLAY>"</span>;</div> 79</div><!-- fragment --><p> The structure of the XML file is:</p> 80<ul> 81<li> 82(declaration) </li> 83<li> 84(dtd stuff) </li> 85<li> 86Element "PLAY" <ul> 87<li> 88Element "TITLE" <ul> 89<li> 90Text "A Midsummer Night's Dream" </li> 91</ul> 92</li> 93</ul> 94</li> 95</ul> 96<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> 97<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> 98<div class="fragment"><div class="line"> </div> 99<div class="line"> XMLDocument doc;</div> 100<div class="line"> doc.Parse( xml );</div> 101<div class="line"> </div> 102<div class="line"> XMLElement* titleElement = doc.FirstChildElement( <span class="stringliteral">"PLAY"</span> )->FirstChildElement( <span class="stringliteral">"TITLE"</span> );</div> 103</div><!-- fragment --><p> We can then use the convenience function GetText() to get the title of the play.</p> 104<div class="fragment"><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span>* title = titleElement->GetText();</div> 105<div class="line"> printf( <span class="stringliteral">"Name of play (1): %s\n"</span>, title );</div> 106</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> 107<pre class="fragment">Consider: A Midsummer Night's <b>Dream</b> 108</pre><p>It is more correct to actually query the Text Node if in doubt:</p> 109<div class="fragment"><div class="line"> </div> 110<div class="line"> XMLText* textNode = titleElement->FirstChild()->ToText();</div> 111<div class="line"> title = textNode->Value();</div> 112<div class="line"> printf( <span class="stringliteral">"Name of play (2): %s\n"</span>, title );</div> 113</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> 114</div></div><!-- contents --> 115</div><!-- PageDoc --> 116<!-- start footer part --> 117<hr class="footer"/><address class="footer"><small> 118Generated on Sun Jun 6 2021 17:10:05 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> 1.9.1 119</small></address> 120</body> 121</html> 122
