1 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://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 1.8.13"/> 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">7.0.0</span> 26 </div> 27 </td> 28 </tr> 29 </tbody> 30 </table> 31 </div> 32 <!-- end header part --> 33 <!-- Generated by Doxygen 1.8.13 --> 34 <script type="text/javascript"> 35 var searchBox = new SearchBox("searchBox", "search",false,'Search'); 36 </script> 37 <script type="text/javascript" src="menudata.js"></script> 38 <script type="text/javascript" src="menu.js"></script> 39 <script type="text/javascript"> 40 $(function() { 41 initMenu('',true,false,'search.php','Search'); 42 $(document).ready(function() { init_search(); }); 43 }); 44 </script> 45 <div id="main-nav"></div> 46 <!-- window showing the filter options --> 47 <div id="MSearchSelectWindow" 48 onmouseover="return searchBox.OnSearchSelectShow()" 49 onmouseout="return searchBox.OnSearchSelectHide()" 50 onkeydown="return searchBox.OnSearchSelectKey(event)"> 51 </div> 52 53 <!-- iframe showing the search results (closed by default) --> 54 <div id="MSearchResultsWindow"> 55 <iframe src="javascript:void(0)" frameborder="0" 56 name="MSearchResults" id="MSearchResults"> 57 </iframe> 58 </div> 59 60 </div><!-- top --> 61 <div class="header"> 62 <div class="headertitle"> 63 <div class="title">Get information out of XML </div> </div> 64 </div><!--header--> 65 <div class="contents"> 66 <div class="textblock"> 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> 67 <p>(The XML is an excerpt from "dream.xml").</p> 68 <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> 69 <p>The structure of the XML file is:</p> 70 <ul> 71 <li> 72 (declaration) </li> 73 <li> 74 (dtd stuff) </li> 75 <li> 76 Element "PLAY" <ul> 77 <li> 78 Element "TITLE" <ul> 79 <li> 80 Text "A Midsummer Night's Dream" </li> 81 </ul> 82 </li> 83 </ul> 84 </li> 85 </ul> 86 <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> 87 <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> 88 <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> 89 <p>We can then use the convenience function GetText() to get the title of the play.</p> 90 <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> 91 <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> 92 <pre class="fragment">Consider: A Midsummer Night's <b>Dream</b> 93 </pre><p>It is more correct to actually query the Text Node if in doubt:</p> 94 <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> 95 <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> 96 </div></div><!-- contents --> 97 <!-- start footer part --> 98 <hr class="footer"/><address class="footer"><small> 99 Generated on Tue Nov 6 2018 09:38:26 for TinyXML-2 by  <a href="http://www.doxygen.org/index.html"> 100 <img class="footer" src="doxygen.png" alt="doxygen"/> 101 </a> 1.8.13 102 </small></address> 103 </body> 104 </html> 105
