Behind the scenes

In Chapter 2, Creating Our First Qt and OpenCV Project, you learned how to create a simple Qt+OpenCV application called Hello_Qt_OpenCV. This project included almost all of the basic features provided by Qt, although we didn't go into too much detail on how our project was built into an application with a user interface and an (almost acceptable) behavior. In this section, you will learn about what went on behind the scenes when we clicked on the Run button. This will help us with a better understanding of the structure of a Qt project and what the purpose of each file in the project folder is. Let's start by opening the project folder and going through the few files one by one. So, we have the following in the Hello_Qt_OpenCV folder:

    Hello_Qt_OpenCV.pro 
    Hello_Qt_OpenCV.pro.user 
    main.cpp 
    mainwindow.cpp 
    mainwindow.h 
    mainwindow.ui 

The first file in the Hello_Qt_OpenCV.pro list is basically the first file that is processed by Qt when our project...