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

Qt Project (.pro) files

The .pro files created by Qt Creator in the earlier examples are actually Qt project files. A .pro file contains all the information required by qmake to build an application, a library, or a plugin. A project file supports both simple and complex build systems. A simple project file may use straightforward declarations, defining standard variables to indicate the source and header files that are used in a project. Complex projects may use multiple flow structures to optimize the build process. A project file contains a series of declarations to specify resources, such as links to the source and header files, libraries required by a project, custom-build processes for different platforms, and so on.

A Qt project file has several sections and uses certain predefined qmake variables. Let's have a look here at our earlier HelloWorld example .pro file:

QT       += core gui
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets...