Book Image

Cross-Platform Development with Qt 6 and Modern C++

By : Nibedit Dey
Book Image

Cross-Platform Development with Qt 6 and Modern C++

By: Nibedit Dey

Overview of this book

Qt is a cross-platform application development framework widely used for developing applications that can run on a wide range of hardware platforms with little to no change in the underlying codebase. If you have basic knowledge of C++ and want to build desktop or mobile applications with a modern graphical user interface (GUI), Qt is the right choice for you. Cross-Platform Development with Qt 6 and Modern C++ helps you understand why Qt is one of the favorite GUI frameworks adopted by industries worldwide, covering the essentials of programming GUI apps across a multitude of platforms using the standard C++17 and Qt 6 features. Starting with the fundamentals of the Qt framework, including the features offered by Qt Creator, this practical guide will show you how to create classic user interfaces using Qt Widgets and touch-friendly user interfaces using Qt Quick. As you advance, you'll explore the Qt Creator IDE for developing applications for multiple desktops as well as for embedded and mobile platforms. You will also learn advanced concepts about signals and slots. Finally, the book takes you through debugging and testing your app with Qt Creator IDE. By the end of this book, you'll be able to build cross-platform applications with a modern GUI along with the speed and power of native apps.
Table of Contents (17 chapters)
Section 1: The Basics
Section 2: Cross-Platform Development
Section 3: Advanced Programming, Debugging, and Deployment

Debugging a Qt Quick application

In the last section, we discussed how to debug your C++ code. But you are probably still wondering how to debug code written in QML. Qt also has a provision to debug your QML code. When you are developing a Qt Quick application, there are a lot of options to troubleshoot issues. In this section, we will discuss various debugging techniques related to QML and how to use them.

Just like the QDebug class, there are different console APIs that are available for debugging in QML. They are as follows:

  • Log: This is used to print general messages.
  • Assert: This is used to verify an expression.
  • Timer: This is used to measure the time spent between calls.
  • Trace: This is used to print a stack trace of a JavaScript execution.
  • Count: This is used to find the number of calls made to a function.
  • Profile: This is used to profile QML and JavaScript code.
  • Exception: It is used to print error messages.

The Console API provides...