Book Image

Mastering Qt 5

By : Guillaume Lazar, Robin Penea
Book Image

Mastering Qt 5

By: Guillaume Lazar, Robin Penea

Overview of this book

Qt 5.7 is an application development framework that provides a great user experience and develops full-capability applications with Qt Widgets, QML, and even Qt 3D. This book will address challenges in successfully developing cross-platform applications with the Qt framework. Cross-platform development needs a well-organized project. Using this book, you will have a better understanding of the Qt framework and the tools to resolve serious issues such as linking, debugging, and multithreading. Your journey will start with the new Qt 5 features. Then you will explore different platforms and learn to tame them. Every chapter along the way is a logical step that you must take to master Qt. The journey will end in an application that has been tested and is ready to be shipped.
Table of Contents (20 chapters)
Mastering Qt 5
Credits
About the Authors
About the Reviewer
www.PacktPub.com
Preface

Making your objects serializable with QVariant


Now that we implemented the logic in our business classes, we have to think about what we are going to serialize and how we are going to do it. The user interacts with a Track class that contains all the data to be recorded and played back.

Starting from here, we can assume that the object to be serialized is Track, which in turn should somehow bring along its mSoundEvents containing a list of SoundEvent instances. To achieve this, we will rely heavily on the QVariant class.

You might have worked with QVariant before. It is a generic placeholder for any primitive type (charintdouble, and so on) but also complex types (QStringQDateQPoint, and many more).

Note

The complete list of QVariant supported types is available at http://doc.qt.io/qt-5/qmetatype.html#Type-enum.

A simple example of QVariant is:

QVariant variant(21); 
 
int answer = variant.toInt() * 2; 
 
qDebug() << "what is the meaning of the universe,  
             life and everything...