The QMessageBox Dialog Box

Often, a dialog box will appear and present crucial information if a user is about to exit an application, save their work, or if an issue happens. The user can then respond to the prompts in that dialog box, often by clicking a button. The QMessageBox dialog box can be used not only to notify the user of a problem but also to provide them with the option to choose how to respond to it. For instance, you might get a dialog box asking you to "Save", "Don't Save", or "Cancel" when you close a document to which you've recently made ...