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<title>Tutorial 25: Xml Handling</title>
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<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
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<!--END TITLEAREA-->
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<!-- end header part -->
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<!-- Generated by Doxygen 1.8.13 -->
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<div class="header">
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<div class="headertitle">
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<div class="title">Tutorial 25: Xml Handling </div> </div>
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</div><!--header-->
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<div class="contents">
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<div class="textblock"><div class="image">
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<img src="../../media/025shot.jpg" alt="025shot.jpg"/>
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</div>
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<p>Demonstrates loading and saving of configurations via XML</p>
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<dl class="section author"><dt>Author</dt><dd>Y.M. Bosman <<a href="#" onclick="location.href='mai'+'lto:'+'yor'+'an'+'.bo'+'sm'+'an@'+'gm'+'ail'+'.c'+'om'; return false;">yoran<span style="display: none;">.nosp@m.</span>.bos<span style="display: none;">.nosp@m.</span>man@g<span style="display: none;">.nosp@m.</span>mail<span style="display: none;">.nosp@m.</span>.com</a>></dd></dl>
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<p>This demo features a fully usable system for configuration handling. The code can easily be integrated into own apps.</p>
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<div class="fragment"><div class="line"><span class="preprocessor">#include <irrlicht.h></span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span>irr;</div><div class="line"><span class="keyword">using namespace </span>core;</div><div class="line"><span class="keyword">using namespace </span>scene;</div><div class="line"><span class="keyword">using namespace </span>video;</div><div class="line"><span class="keyword">using namespace </span>io;</div><div class="line"><span class="keyword">using namespace </span>gui;</div><div class="line"></div><div class="line"><span class="preprocessor">#ifdef _IRR_WINDOWS_</span></div><div class="line"><span class="preprocessor">#pragma comment(lib, "Irrlicht.lib")</span></div><div class="line"><span class="preprocessor">#endif</span></div></div><!-- fragment --><p> SettingManager class.</p>
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<p>This class loads and writes the settings and manages the options.</p>
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<p>The class makes use of irrMap which is a an associative arrays using a red-black tree it allows easy mapping of a key to a value, along the way there is some information on how to use it. </p><div class="fragment"><div class="line"><span class="keyword">class </span>SettingManager</div><div class="line">{</div><div class="line"><span class="keyword">public</span>:</div><div class="line"></div><div class="line"> <span class="comment">// Construct setting managers and set default settings</span></div><div class="line"> SettingManager(<span class="keyword">const</span> stringw& settings_file): SettingsFile(settings_file), NullDevice(0)</div><div class="line"> {</div><div class="line"> <span class="comment">// Irrlicht null device, we want to load settings before we actually created our device, therefore, nulldevice</span></div><div class="line"> NullDevice = irr::createDevice(irr::video::EDT_NULL);</div><div class="line"></div><div class="line"> <span class="comment">//DriverOptions is an irrlicht map,</span></div><div class="line"> <span class="comment">//we can insert values in the map in two ways by calling insert(key,value) or by using the [key] operator</span></div><div class="line"> <span class="comment">//the [] operator overrides values if they already exist</span></div><div class="line"> DriverOptions.insert(L<span class="stringliteral">"Software"</span>, EDT_SOFTWARE);</div><div class="line"> DriverOptions.insert(L<span class="stringliteral">"OpenGL"</span>, EDT_OPENGL);</div><div class="line"> DriverOptions.insert(L<span class="stringliteral">"Direct3D9"</span>, EDT_DIRECT3D9);</div><div class="line"></div><div class="line"> <span class="comment">//some resolution options</span></div><div class="line"> ResolutionOptions.insert(L<span class="stringliteral">"640x480"</span>, dimension2du(640,480));</div><div class="line"> ResolutionOptions.insert(L<span class="stringliteral">"800x600"</span>, dimension2du(800,600));</div><div class="line"> ResolutionOptions.insert(L<span class="stringliteral">"1024x768"</span>, dimension2du(1024,768));</div><div class="line"></div><div class="line"> <span class="comment">//our preferred defaults</span></div><div class="line"> SettingMap.insert(L<span class="stringliteral">"driver"</span>, L<span class="stringliteral">"Direct3D9"</span>);</div><div class="line"> SettingMap.insert(L<span class="stringliteral">"resolution"</span>, L<span class="stringliteral">"640x480"</span>);</div><div class="line"> SettingMap.insert(L<span class="stringliteral">"fullscreen"</span>, L<span class="stringliteral">"0"</span>); <span class="comment">//0 is false</span></div><div class="line"> }</div><div class="line"></div><div class="line"> <span class="comment">// Destructor, you could store settings automatically on exit of your</span></div><div class="line"> <span class="comment">// application if you wanted to in our case we simply drop the</span></div><div class="line"> <span class="comment">// nulldevice</span></div><div class="line"> ~SettingManager()</div><div class="line"> {</div><div class="line"> <span class="keywordflow">if</span> (NullDevice)</div><div class="line"> {</div><div class="line"> NullDevice->closeDevice();</div><div class="line"> NullDevice->drop();</div><div class="line"> }</div><div class="line"> };</div></div><!-- fragment --><p> Load xml from disk, overwrite default settings The xml we are trying to load has the following structure settings nested in sections nested in the root node, like: </p><pre class="fragment"> <pre>
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<?xml version="1.0"?>
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<mygame>
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<video>
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<setting name="driver" value="Direct3D9" />
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<setting name="fullscreen" value="0" />
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<setting name="resolution" value="1024x768" />
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</video>
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</mygame>
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</pre></pre> <div class="fragment"><div class="line"> <span class="keywordtype">bool</span> load()</div><div class="line"> {</div><div class="line"> <span class="comment">//if not able to create device don't attempt to load</span></div><div class="line"> <span class="keywordflow">if</span> (!NullDevice)</div><div class="line"> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"></div><div class="line"> irr::io::IXMLReader* xml = NullDevice->getFileSystem()->createXMLReader(SettingsFile); <span class="comment">//create xml reader</span></div><div class="line"> <span class="keywordflow">if</span> (!xml)</div><div class="line"> <span class="keywordflow">return</span> <span class="keyword">false</span>;</div><div class="line"></div><div class="line"> <span class="keyword">const</span> stringw settingTag(L<span class="stringliteral">"setting"</span>); <span class="comment">//we'll be looking for this tag in the xml</span></div><div class="line"> stringw currentSection; <span class="comment">//keep track of our current section</span></div><div class="line"> <span class="keyword">const</span> stringw videoTag(L<span class="stringliteral">"video"</span>); <span class="comment">//constant for videotag</span></div><div class="line"></div><div class="line"> <span class="comment">//while there is more to read</span></div><div class="line"> <span class="keywordflow">while</span> (xml->read())</div><div class="line"> {</div><div class="line"> <span class="comment">//check the node type</span></div><div class="line"> <span class="keywordflow">switch</span> (xml->getNodeType())</div><div class="line"> {</div><div class="line"> <span class="comment">//we found a new element</span></div><div class="line"> <span class="keywordflow">case</span> irr::io::EXN_ELEMENT:</div><div class="line"> {</div><div class="line"> <span class="comment">//we currently are in the empty or mygame section and find the video tag so we set our current section to video</span></div><div class="line"> <span class="keywordflow">if</span> (currentSection.empty() && videoTag.equals_ignore_case(xml->getNodeName()))</div><div class="line"> {</div><div class="line"> currentSection = videoTag;</div><div class="line"> }</div><div class="line"> <span class="comment">//we are in the video section and we find a setting to parse</span></div><div class="line"> <span class="keywordflow">else</span> <span class="keywordflow">if</span> (currentSection.equals_ignore_case(videoTag) && settingTag.equals_ignore_case(xml->getNodeName() ))</div><div class="line"> {</div><div class="line"> <span class="comment">//read in the key</span></div><div class="line"> stringw key = xml->getAttributeValueSafe(L<span class="stringliteral">"name"</span>);</div><div class="line"> <span class="comment">//if there actually is a key to set</span></div><div class="line"> <span class="keywordflow">if</span> (!key.empty())</div><div class="line"> {</div><div class="line"> <span class="comment">//set the setting in the map to the value,</span></div><div class="line"> <span class="comment">//the [] operator overrides values if they already exist or inserts a new key value</span></div><div class="line"> <span class="comment">//pair into the settings map if it was not defined yet</span></div><div class="line"> SettingMap[key] = xml->getAttributeValueSafe(L<span class="stringliteral">"value"</span>);</div><div class="line"
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