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)

Logging custom objects to QDebug

When you are debugging complex objects, it is nice to output their current members' value to qDebug(). In other languages (such as Java), you may have encountered the toString() method or its equivalent, which is very convenient.

Sure, you could add a function void toString() to each object that you want to log, in order to write code with the following syntax:

qDebug() << "Object content:" << myObject.toString() 

There must be a more natural way of doing this in C++. Moreover, Qt already provides this kind of feature:

QDate today = QDate::currentDate();
qDebug() << today;
// Output: QDate("2016-10-03")

To achieve this, we will rely on a C++ operator overload. This will look very similar to what we did with QDataStream operators in Chapter 10, Need IPC? Get Your Minions to Work.

Consider a struct Person...