To create a window(ed) application, we usually call the show() method on an instance of QWidget and that makes that widget, to be contained in a window of its own, along with its child widgets displayed in it.
A recap of such a simple application is as follows:
#include <QApplication>#include <QMainWindow>#include <QLabel>int main(int argc, char *argv[]){ QApplication a(argc, argv); QMainWindow mainWindow; mainWindow.show(); return a.exec();}
mainWindow here is an instance of QMainWindow, which is derived from QWidget. As such, by calling the show() method, a window will appear. If you were to replace QMainWindow with QLabel, this will still work.
But this style of writing applications is not the best. Instead, from ...
