Get Started!

Open a new project

Choose Qt widget Application to create a desktop application.

A blank project is consist of these files below:

• main.cpp
• mainwindow.cpp, mainwindow.h, mainwindow.ui
• *.pro

mainwindow is where you design your user interface. The *.pro file stores the library, include library paths. It also records the project related files path, and the compile flags.

Open a project from another computer

If you want to open a project from another computer, Qt will ask if you want to load the Qt's *.user settings file, press No.

Reconfigure your project, in this case, we'll check Desktop Qt 5.3 MSVC2013 OpenGL 64bit.

A new *.pro.user will be created, and the old one will be renamed as a backup file.

The mainwindow class

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
}

The code written inside the braces executes when the application enter the mainwindow class. You can initial your values here.

If you are using any compiler that supports C++11 or above, you can also initial part of your variables in the header file.

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;

    //Initialization
    int hello = 1;
};

The code below executes when the application exit the mainwindow class. If you want to release memory or something else, you can write your code here.

MainWindow::~MainWindow()
{
    delete ui;
}