Adding the CPP file

The last step in creating a project for an HMI is to add the C++ code that runs the application and loads the QML file.

1. In the Project view, right-click the QtHmi folder and click Add New...
2. In the New File dialog, select C++ in the Files and Classes list, then C++ Source file in the list of file types (shown in the middle), then click Choose...
3. In the Location page of the New C++ Source File dialog, name the file main, then click Next.
4. In the Summary page, click Finish.

   A new file, main.cpp, has been added to the project and opened for editing.

5. Add the following code to this file:

   #include <QtGui/QGuiApplication>
   #include <QtQuick/QQuickView>
   #include <QScreen>
   
   int main(int argc, char *argv[])
   {
       QGuiApplication app(argc, argv);
   
       // Get the screens so we can dynamically size our display 
       QList<QScreen*> screens = QGuiApplication::screens();
   
       // Quit if no screen is connected
       if (screens.empty()) {
           return 1;
       }
   
       // Get the width and height of the display
       int w = screens[0]->size().width();
       int h = screens[0]->size().height();
   
       QQuickView view;
   
       // Set the main QML user interface file to this view
       view.setSource(QUrl("qrc:/qml/main.qml"));
   
       // Set up the view to have the proper size
       view.setResizeMode(QQuickView::SizeRootObjectToView);
       view.resize(w, h);
   
       // Show our user interface
       view.show();
   
       return app.exec();
   }
   

   Note that the view.setSource() call uses the qrc: prefix for the QUrl object. This is how the application accesses resources in the resources.qrc file.