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<td >Qt 5.12</td><td ><a href="qtscxml-index.html">Qt SCXML</a></td><td ><a href="examples-qtscxml.html">Qt SCXML Examples</a></td><td >Qt SCXML Invoke Example (Static)</td></tr></table><table class="buildversion"><tr>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#running-the-example">Running the Example</a></li>
<li class="level1"><a href="#invoking-the-state-machine">Invoking the State Machine</a></li>
<li class="level1"><a href="#compiling-the-state-machine">Compiling the State Machine</a></li>
<li class="level1"><a href="#instantiating-the-state-machine">Instantiating the State Machine</a></li>
</ul>
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<h1 class="title">Qt SCXML Invoke Example (Static)</h1>
<span class="subtitle"></span>
<!-- $$$invoke-static-brief -->
<p>Invokes a compiled nested state machine.</p>
<!-- @@@invoke-static -->
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<div class="descr"> <a name="details"></a>
<p class="centerAlign"><img src="images/invoke-static.png" alt="" /></p><p><i>Invoke Example (Static)</i> demonstrates how to use the <code><invoke></code> element with generated nested state-machines, where the SCXML file is compiled to a C++ class. The <code><invoke></code> element is used to create an instance of an external service.</p>
<a name="running-the-example"></a>
<h2 id="running-the-example">Running the Example</h2>
<p>To run the example from Qt Creator, open the <b>Welcome</b> mode and select the example from <b>Examples</b>. For more information, visit Building and Running an Example.</p>
<a name="invoking-the-state-machine"></a>
<h2 id="invoking-the-state-machine">Invoking the State Machine</h2>
<p>In <i>statemachine.scxml</i>, we specify a state machine with the name <i>Directions</i> of type <i>http://www.w3.org/TR/scxml/</i> to invoke:</p>
<pre class="cpp">
<scxml
xmlns="http://www.w3.org/2005/07/scxml"
version="1.0"
name="Directions"
initial="anyplace"
>
<state id="anyplace">
<transition event="goNowhere" target="nowhere"/>
<transition event="goSomewhere" target="somewhere"/>
<state id="nowhere"/>
<state id="somewhere">
<invoke type="http://www.w3.org/TR/scxml/">
<content>
<scxml name="anywhere" version="1.0">
<state id="here">
<transition event="goThere" target="there"/>
</state>
<state id="there">
<transition event="goHere" target="here"/>
</state>
</scxml>
</content>
</invoke>
</state>
</state>
</scxml>
</pre>
<a name="compiling-the-state-machine"></a>
<h2 id="compiling-the-state-machine">Compiling the State Machine</h2>
<p>We link against the Qt SCXML module by adding the following line to the <i>invoke-static.pro</i> file:</p>
<pre class="cpp">
QT += qml scxml
</pre>
<p>We then specify the state machine to compile:</p>
<pre class="cpp">
STATECHARTS = ../invoke-common/statemachine.scxml
</pre>
<p>The Qt SCXML Compiler, <code>qscxmlc</code>, is run automatically to generate <i>statemachine.h</i> and <i>statemachine.cpp</i>, and to add them to the <code>HEADERS</code> and <code>SOURCES</code> variables for compilation.</p>
<a name="instantiating-the-state-machine"></a>
<h2 id="instantiating-the-state-machine">Instantiating the State Machine</h2>
<p>We instantiate the generated <code>Directions</code> class in the <i>invoke-static.cpp</i> file, as follows:</p>
<pre class="cpp">
<span class="preprocessor">#include "statemachine.h"</span>
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type">QGuiApplication</span> app(argc<span class="operator">,</span> argv);
qmlRegisterType<span class="operator"><</span>Directions<span class="operator">></span>(<span class="string">"Directions"</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="string">"Directions"</span>);
<span class="type">QQmlApplicationEngine</span> engine;
engine<span class="operator">.</span>load(<span class="type">QUrl</span>(<span class="type">QStringLiteral</span>(<span class="string">"qrc:/invoke-static.qml"</span>)));
<span class="keyword">if</span> (engine<span class="operator">.</span>rootObjects()<span class="operator">.</span>isEmpty())
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
<p>Files:</p>
<ul>
<li><a href="qtscxml-invoke-static-invoke-static-cpp.html">invoke-static/invoke-static.cpp</a></li>
<li><a href="qtscxml-invoke-static-invoke-static-pro.html">invoke-static/invoke-static.pro</a></li>
<li><a href="qtscxml-invoke-static-invoke-static-qml.html">invoke-static/invoke-static.qml</a></li>
<li><a href="qtscxml-invoke-static-invoke-static-qrc.html">invoke-static/invoke-static.qrc</a></li>
<li><a href="qtscxml-invoke-static-statemachine-cpp.html">invoke-static/statemachine.cpp</a></li>
<li><a href="qtscxml-invoke-static-statemachine-h.html">invoke-static/statemachine.h</a></li>
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