<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "https://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" lang="en-US"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=11"/> <meta name="generator" content="Doxygen 1.10.0"/> <meta name="viewport" content="width=device-width, initial-scale=1"/> <title>TinyXML-2: Get information out of XML</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <script type="text/javascript" src="clipboard.js"></script> <script type="text/javascript" src="cookie.js"></script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/searchdata.js"></script> <script type="text/javascript" src="search/search.js"></script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr id="projectrow"> <td id="projectalign"> <div id="projectname">TinyXML-2<span id="projectnumber"> 10.0.0</span> </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.10.0 --> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */ var searchBox = new SearchBox("searchBox", "search/",'.html'); /* @license-end */ </script> <script type="text/javascript" src="menudata.js"></script> <script type="text/javascript" src="menu.js"></script> <script type="text/javascript"> /* @license magnet:?xt=urn:btih:d3d9a9a6595521f9666a5e94cc830dab83b65699&dn=expat.txt MIT */ $(function() { initMenu('',true,false,'search.php','Search'); $(function() { init_search(); }); }); /* @license-end */ </script> <div id="main-nav"></div> <!-- window showing the filter options --> <div id="MSearchSelectWindow" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" onkeydown="return searchBox.OnSearchSelectKey(event)"> </div> <!-- iframe showing the search results (closed by default) --> <div id="MSearchResultsWindow"> <div id="MSearchResults"> <div class="SRPage"> <div id="SRIndex"> <div id="SRResults"></div> <div class="SRStatus" id="Loading">Loading...</div> <div class="SRStatus" id="Searching">Searching...</div> <div class="SRStatus" id="NoMatches">No Matches</div> </div> </div> </div> </div> </div><!-- top --> <div><div class="header"> <div class="headertitle"><div class="title">Get information out of XML</div></div> </div><!--header--> <div class="contents"> <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> <p>(The XML is an excerpt from "dream.xml").</p> <div class="fragment"><div class="line"><span class="keywordtype">int</span> example_3()</div> <div class="line">{</div> <div class="line"> <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">char</span>* xml =</div> <div class="line"> <span class="stringliteral">"<?xml version=\"1.0\"?>"</span></div> <div class="line"> <span class="stringliteral">"<!DOCTYPE PLAY SYSTEM \"play.dtd\">"</span></div> <div class="line"> <span class="stringliteral">"<PLAY>"</span></div> <div class="line"> <span class="stringliteral">"<TITLE>A Midsummer Night's Dream</TITLE>"</span></div> <div class="line"> <span class="stringliteral">"</PLAY>"</span>;</div> </div><!-- fragment --><p> The structure of the XML file is:</p> <ul> <li> (declaration) </li> <li> (dtd stuff) </li> <li> Element "PLAY" <ul> <li> Element "TITLE" <ul> <li> Text "A Midsummer Night's Dream" </li> </ul> </li> </ul> </li> </ul> <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> <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> <div class="fragment"><div class="line"> </div> <div class="line"> XMLDocument doc;</div> <div class="line"> doc.Parse( xml );</div> <div class="line"> </div> <div class="line"> XMLElement* titleElement = doc.FirstChildElement( <span class="stringliteral">"PLAY"</span> )->FirstChildElement( <span class="stringliteral">"TITLE"</span> );</div> </div><!-- fragment --><p> We can then use the convenience function GetText() to get the title of the play.</p> <div class="fragment"><div class="line"> <span class="keyword">const</span> <span class="keywordtype">char</span>* title = titleElement->GetText();</div> <div class="line"> printf( <span class="stringliteral">"Name of play (1): %s\n"</span>, title );</div> </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> <pre class="fragment">Consider: A Midsummer Night's <b>Dream</b> </pre><p>It is more correct to actually query the Text Node if in doubt:</p> <div class="fragment"><div class="line"> </div> <div class="line"> XMLText* textNode = titleElement->FirstChild()->ToText();</div> <div class="line"> title = textNode->Value();</div> <div class="line"> printf( <span class="stringliteral">"Name of play (2): %s\n"</span>, title );</div> </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> </div></div><!-- contents --> </div><!-- PageDoc --> <!-- start footer part --> <hr class="footer"/><address class="footer"><small> Generated 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 </small></address> </body> </html>