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)

Generating a command-line interface

The command-line interface can be a wonderful way to start your application with specific options. The Qt framework provides an easy way to define your options, with the QCommandLineParser class. You can provide a short (for example, -t) or a long (for example, --test) option name. The application version and help menu are automatically generated. You can easily check in your C++ code whether an option is set or not. An option can take a value and you can define a default value.

For example, we can create a CLI to configure the log files. We want to define three options, as follows:

  • The -debug command, if set, enables the log file writing
  • The -f or --file command defines where to write the logs
  • The -l or --level <level> command specifies the minimum log level

Look at the following snippet:

QCoreApplication app(argc, argv);