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

Improving log messages


Qt offers multiple ways of doing this. 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, from the least to the most critical level:

  • qDebug(): This is used to write custom debug messages

  • qInfo(): This is used to write informational messages

  • qWarning(): This is used to write warnings and recoverable errors in your applications

  • qCrtitical(): This is used to write critical error messages and report system errors

  • qFatal(): This is used to write a last message before automatically existing

Try to always use the most appropriate one!

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 software to change the pattern. The pattern...