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 #include &lt;QtGui&gt;

 #include &quot;echowindow.h&quot;

 EchoWindow::EchoWindow()
 {
     createGUI();
     setLayout(layout);
     setWindowTitle(&quot;Echo Plugin Example&quot;);

     if (!loadPlugin()) {
         QMessageBox::information(this, &quot;Error&quot;, &quot;Could not load the plugin&quot;);
         lineEdit-&gt;setEnabled(false);
         button-&gt;setEnabled(false);
     }
 }

 void EchoWindow::sendEcho()
 {
     QString text = echoInterface-&gt;echo(lineEdit-&gt;text());
     label-&gt;setText(text);
 }

 void EchoWindow::createGUI()
 {
     lineEdit = new QLineEdit;
     label = new QLabel;
     label-&gt;setFrameStyle(QFrame::Box | QFrame::Plain);
     button = new QPushButton(tr(&quot;Send Message&quot;));

     connect(lineEdit, SIGNAL(editingFinished()),
             this, SLOT(sendEcho()));
     connect(button, SIGNAL(clicked()),
             this, SLOT(sendEcho()));

     layout = new QGridLayout;
     layout-&gt;addWidget(new QLabel(tr(&quot;Message:&quot;)), 0, 0);
     layout-&gt;addWidget(lineEdit, 0, 1);
     layout-&gt;addWidget(new QLabel(tr(&quot;Answer:&quot;)), 1, 0);
     layout-&gt;addWidget(label, 1, 1);
     layout-&gt;addWidget(button, 2, 1, Qt::AlignRight);
     layout-&gt;setSizeConstraint(QLayout::SetFixedSize);
 }

 bool EchoWindow::loadPlugin()
 {
     QDir pluginsDir(qApp-&gt;applicationDirPath());
 #if defined(Q_OS_WIN)
     if (pluginsDir.dirName().toLower() == &quot;debug&quot; || pluginsDir.dirName().toLower() == &quot;release&quot;)
         pluginsDir.cdUp();
 #elif defined(Q_OS_MAC)
     if (pluginsDir.dirName() == &quot;MacOS&quot;) {
         pluginsDir.cdUp();
         pluginsDir.cdUp();
         pluginsDir.cdUp();
     }
 #endif
     pluginsDir.cd(&quot;plugins&quot;);
     foreach (QString fileName, pluginsDir.entryList(QDir::Files)) {
         QPluginLoader pluginLoader(pluginsDir.absoluteFilePath(fileName));
         QObject *plugin = pluginLoader.instance();
         if (plugin) {
             echoInterface = qobject_cast&lt;EchoInterface *&gt;(plugin);
             if (echoInterface)
                 return true;
         }
     }

     return false;
 }</pre>
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