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)

Improving log messages

Qt offers multiple methods for improving log messages. A good compromise between the result and its complexity is to combine the Qt log type with a custom message pattern.

Qt defines five log types, listed as follows, from the least to the most critical level:

  • qDebug(): Custom debug messages
  • qInfo(): Informational messages
  • qWarning(): Warnings and recoverable errors in your applications
  • qCrtical(): Critical error messages and system errors
  • qFatal(): Write a last message before automatically exiting

Try to always use the most appropriate option!

By default, the message pattern is configured to only display your message without any extra data, but you can customize the pattern to display more information. This pattern can be changed at runtime by setting the QT_MESSAGE_PATTERN environment variable. You can also call the qSetMessagePattern function from your...