Book Image

Hands-On Mobile and Embedded Development with Qt 5

By : Lorn Potter
Book Image

Hands-On Mobile and Embedded Development with Qt 5

By: Lorn Potter

Overview of this book

Qt is a world-class framework, helping you to develop rich graphical user interfaces (GUIs) and multi-platform applications that run on all major desktop platforms and most mobile or embedded platforms. The framework helps you connect the dots across platforms and between online and physical experience. This book will help you leverage the fully-featured Qt framework and its modular cross-platform library classes and intuitive APIs to develop applications for mobile, IoT, and industrial embedded systems. Considerations such as screen size, device orientation changes, and small memory will be discussed. We will focus on various core aspects of embedded and mobile systems, such as connectivity, networking, and sensors; there is no IoT without sensors. You will learn how to quickly design a flexible, fast, and responsive UI that looks great. Going further, you will implement different elements in a matter of minutes and synchronize the UI elements with the 3D assets with high precision. You will learn how to create high-performance embedded systems with 3D/2D user interfaces, and deploy and test on your target hardware. The book will explore several new features, including Qt for WebAssembly. At the end of this book, you will learn about creating a full software stack for embedded Linux systems using Yocto and Boot to Qt for Device Creation.
Table of Contents (23 chapters)
Title Page
Dedication
About Packt
Foreword
Contributors
Preface
Index

Building with the command line


Building a Qt for a WebAssembly application requires you to source the Emscripten environment file, so run this in your console command as follows:

source /path/to/emsdk/emsdk_env.sh

You will need to add the path to Qt for WebAssembly qmake as follows:

export PATH=/path/to/QtForWebAssembly/bin:$PATH.

Of course, you must replace /path/to with the actual filesystem path.

You are then ready for action! You build it just like any other Qt app, by running qmake as follows:

qmake mycoolapp.pro && make.

If you need to debug, rerun qmake with CONFIG+=debug as follows:

qmake CONFIG+=debug mycoolapp.pro && make.

This will add various Emscripten specific arguments to the compiler and linker.

Once it is built, you can run it by using the emrun command from Emscripten, which will start a simple web server and serve the <target>.html file. This will, in turn, load up qtloader.js, which, in turn, loads up the <target>.js file, which loads the <target...