Book Image

Hands-On Embedded Programming with Qt

By : John Werner
Book Image

Hands-On Embedded Programming with Qt

By: John Werner

Overview of this book

Qt is an open source toolkit suitable for cross-platform and embedded application development. This book uses inductive teaching to help you learn how to create applications for embedded and Internet of Things (IoT) devices with Qt 5. You’ll start by learning to develop your very first application with Qt. Next, you’ll build on the first application by understanding new concepts through hands-on projects and written text. Each project will introduce new features that will help you transform your basic first project into a connected IoT application running on embedded hardware. In addition to gaining practical experience in developing an embedded Qt project, you will also gain valuable insights into best practices for Qt development and explore advanced techniques for testing, debugging, and monitoring the performance of Qt applications. The examples and projects covered throughout the book can be run both locally and on an embedded platform. By the end of this book, you will have the skills you need to use Qt 5 to confidently develop modern embedded applications.
Table of Contents (22 chapters)
Free Chapter
Section 1: Getting Started with Embedded Qt
Section 2: Working with Embedded Qt
Section 3: Deep Dive into Embedded Qt
Section 4: Advanced Techniques and Best Practices
Appendix A: BigProject Requirements

Communicating effectively – signals and slots

In Chapter 2, Writing Your First Qt Application, I provided a very brief introduction to slots and signals, and talked about how clicking on the Enter Name button is communicated to MainWindow. That should have been just enough to whet your appetite to know more.

Signals and slots are one of the fundamental building blocks of Qt. They are used to connect GUI elements to code. They are also used to talk between objects in an application. They form the basis of communication within a Qt application. Therefore, we should spend a little time learning about them.

We will start with a quick overview. Then we will look at how they can be used outside of the GUI. After that, we will see how we can use lambda functions with them. Finally, we will learn about direct and queued connections between signals and slots.