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105 lines
5.9 KiB
105 lines
5.9 KiB
4 months ago
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<title>TinyXML-2: Get information out of XML</title>
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<div id="projectname">TinyXML-2
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 <span id="projectnumber">7.0.0</span>
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<div class="header">
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<div class="headertitle">
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<div class="title">Get information out of XML </div> </div>
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</div><!--header-->
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<div class="contents">
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<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>
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<p>(The XML is an excerpt from "dream.xml").</p>
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<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>
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<p>The structure of the XML file is:</p>
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<ul>
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<li>
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(declaration) </li>
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<li>
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(dtd stuff) </li>
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<li>
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Element "PLAY" <ul>
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<li>
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Element "TITLE" <ul>
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<li>
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Text "A Midsummer Night's Dream" </li>
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</ul>
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</li>
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</ul>
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</li>
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</ul>
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<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>
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<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>
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<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>
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<p>We can then use the convenience function GetText() to get the title of the play.</p>
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<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>
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<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>
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<pre class="fragment">Consider: A Midsummer Night's <b>Dream</b>
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</pre><p>It is more correct to actually query the Text Node if in doubt:</p>
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<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>
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<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>
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Generated on Tue Nov 6 2018 09:38:26 for TinyXML-2 by  <a href="http://www.doxygen.org/index.html">
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</a> 1.8.13
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