Book Image

Mastering Qt 5 - Second Edition

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5 - Second Edition

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.11 is an app development framework that provides a great user experience and develops full capability applications with Qt Widgets, QML, and even Qt 3D. Whether you're building GUI prototypes or fully-fledged cross-platform GUI applications with a native look and feel, Mastering Qt 5 is your fastest, easiest, and most powerful solution. This book addresses various challenges and teaches you to successfully develop cross-platform applications using the Qt framework, with the help of well-organized projects. Working through this book, you will gain a better understanding of the Qt framework, as well as the tools required to resolve serious issues, such as linking, debugging, and multithreading. You'll start off your journey by discovering the new Qt 5.11 features, soon followed by exploring different platforms and learning to tame them. In addition to this, you'll interact with a gamepad using Qt Gamepad. Each chapter is a logical step for you to complete in order to master Qt. By the end of this book, you'll have created an application that has been tested and is ready to be shipped.
Table of Contents (16 chapters)

Profiling your QML application

Qt Creator provides a QML profiler to collect useful data on your application during the runtime. You can use it on a desktop and also on a remote target such as our Raspberry Pi. Let's check that your debug build configuration allows QML debugging and profiling. Click on Projects | Rpi 2 | Build. Then, you can click on Details of qmake from Build Steps. You should also check it for your desktop kit:

By default, data is only sent from target to host when you stop profiling. You can flush data periodically with Tools | Options | Analyser | QML Profiler.

Keep in mind that flushing data while profiling frees memory on the target device but takes time. Thus, it can affect your profiling result and analysis.

While we are using Qt Creator kits, we can start the QML profiler in the same way for desktops or remote devices. Switch to a kit and click...