C++ Reactive Programming

Executing the application

We can now write main.cpp to create the Dialog class and display it:

#include "dialog.h" 
#include <QApplication> 
 
int main(int argc, char *argv[]) 
{ 
    QApplication app(argc, argv); 
    Dialog dialog; 
    dialog.resize(545, 337); 
    dialog.show(); 
    return app.exec(); 
} 

This piece of code is exactly like the Hello World Qt application that we discussed. Instead of a QLabel, we are instantiating the Dialog class we created, resizing the dialog window frame to a predefined value by using the resize() function. Now, the application is ready to build and run. But, before building the application, let us handcode the project file:

QT += widgets 
 
SOURCES +=  
        main.cpp  
        dialog.cpp  
    my_qlabel.cpp 
 
HEADERS +=  
        dialog.h  
    my_qlabel.h 

Now, build the ...