Qt.io Download Open Source: How to Get Started with Qt Framework
If you are looking for a powerful, cross-platform, and open source framework for developing applications and embedded systems, you might want to check out Qt. Qt is a comprehensive framework that offers a rich set of tools, libraries, and modules that can help you create stunning user interfaces, fluid animations, high-performance graphics, and more. In this article, we will show you how to get started with Qt for open source development. We will cover:
What is Qt and why use it for open source development?
How to choose the right license for your project?
How to download Qt for open source development?
How to install Qt on your system?
How to create your first Qt application?
By the end of this article, you will have a basic understanding of Qt framework and how to use it for your open source projects. Let's dive in!
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What is Qt and why use it for open source development?
Qt is a framework that enables you to develop applications and embedded systems that run on multiple platforms with native performance and look-and-feel. You can use Qt to create desktop applications, mobile applications, web applications, embedded systems, IoT devices, automotive infotainment systems, and more.
Qt is based on C++, which is a powerful and versatile programming language that offers high performance, low-level access, and object-oriented features. However, Qt also provides other options for developing applications, such as QML, which is a declarative language for creating dynamic user interfaces, and Python, which is a popular scripting language that can be used with Qt via PyQt or PySide bindings.
One of the main advantages of Qt is that it is open source, which means that you can access the source code, modify it, and contribute to it. Qt is licensed under various open source licenses, such as LGPL, GPL, and QPL, depending on the version and the modules you use. This gives you the freedom and flexibility to use Qt for your own projects, as well as to share your work with the community.
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Another benefit of Qt is that it has a large and active community of developers, users, and supporters. You can find many resources, tutorials, examples, forums, blogs, podcasts, and events related to Qt online. You can also join the Qt community and participate in discussions, feedback, bug reports, feature requests, and code contributions.
Qt is also known for its high quality and reliability. Qt has been around for more than 25 years and has been used by thousands of companies and organizations worldwide for various projects and products. Some of the well-known examples of open source projects using Qt are KDE, VLC, Wireshark, MuseScore, Calibre, and Inkscape.
As you can see, Qt is a framework that offers many features and benefits for open source development. Whether you want to create a simple application or a complex system, Qt can help you achieve your goals with ease and efficiency.
How to choose the right license for your project?
If you decide to use Qt for your open source project, you need to choose the right license for your project. This is important because the license determines how you can use, distribute, and modify Qt and your own code. You also need to comply with the license obligations and respect the rights of the original authors.
Qt offers different open source licenses for different versions and modules. The main ones are:
LGPL (Lesser General Public License): This is a copyleft license that allows you to use Qt for free as long as you link dynamically to the Qt libraries and make your modifications to Qt available under the same license. You can use this license for both commercial and non-commercial projects.
GPL (General Public License): This is a stronger copyleft license that requires you to release your entire application under the same license if you use any part of Qt. You can only use this license for non-commercial projects.
QPL (Qt Public License): This is a license specific to Qt that is similar to GPL but has some additional terms and conditions. You can only use this license for non-commercial projects.
To help you choose the right license for your project, you can use the for more information and details about the different licenses.
How to download Qt for open source development?
Once you have chosen the right license for your project, you can download Qt for open source development from the official website. There are different options for downloading Qt depending on your needs and preferences. The main ones are:
Qt Online Installer: This is an executable file that allows you to download and install the latest version of Qt and its components over the internet. You can choose which components and modules you want to install and customize your installation according to your requirements.
Qt Offline Installer: This is a compressed file that contains all the components and modules of a specific version of Qt. You can download it once and install it on multiple machines without an internet connection. However, you cannot update or modify your installation using this option.
Qt Source Packages: These are compressed files that contain the source code of Qt and its components. You can download them if you want to build Qt from scratch or modify it according to your needs. However, this option requires more time and skills than the other options.
The table below shows the components and modules included in each option:
OptionComponentsModules
Qt Online Installer- Qt Essentials- Qt Add-Ons- Qt Tools- Qt Preview- Qt Debug Information Files- Qt Base- Qt Widgets- Qt Quick- Qt Multimedia- Qt Network- Qt WebEngine- Qt Charts- Qt Data Visualization- Qt 3D- Qt Virtual Keyboard- Qt Creator- Qt Designer- Qt Linguist- Qt Assistant- Qt Installer Framework- and more
Qt Offline Installer- Qt Essentials- Qt Add-Ons- Qt ToolsSame as above
Qt Source Packages- Qt Base Source Package- Qt WebEngine Source Package- Other Source PackagesSame as above
You can download the option that suits you best from the . You will need to create a free Qt account or log in with your existing account to access the download links. You will also need to accept the open source license agreement before downloading.
How to install Qt on your system?
After downloading Qt, you can install it on your system by following these steps:
If you downloaded the Qt Online Installer, run the executable file and follow the instructions on the screen. You will be able to choose which components and modules you want to install and where to install them. You will also be able to configure some settings, such as the network proxy and the installation directory.
If you downloaded the Qt Offline Installer, extract the compressed file and run the setup program. You will be able to choose which components and modules you want to install and where to install them. You will also be able to configure some settings, such as the installation directory.
If you downloaded the Qt Source Packages, extract the compressed files and follow the instructions in the README file. You will need to have a compiler and other tools installed on your system to build Qt from source. You will also be able to customize some options, such as the target platform and the features.
The installation process may take some time depending on your system and internet speed. Here is a screenshot of what it looks like:
Once the installation is complete, you can use the maintenance tool to update or modify your Qt installation. You can find the maintenance tool in the installation directory or in the start menu. The maintenance tool allows you to add or remove components and modules, change settings, repair or uninstall Qt, and check for updates.
How to create your first Qt application?
Now that you have installed Qt on your system, you are ready to create your first Qt application. To do so, you will need to use Qt Creator, which is an integrated development environment (IDE) that comes with Qt. Qt Creator provides a user-friendly interface and a rich set of tools for developing, debugging, testing, and deploying Qt applications.
To create your first Qt application, follow these steps:
Launch Qt Creator and select File > New File or Project.
Select Application > Qt Widgets Application or Application > Qt Quick Application depending on whether you want to use C++ and widgets or QML and Quick for your user interface. Click Choose.
Enter a name and a location for your project. Click Next.
Select the kit (combination of compiler, debugger, and device) that you want to use for your project. Click Next.
Select the class name and base class for your main window if you are using widgets or select the minimum required QML module if you are using Quick. Click Next.
Review the project summary and click Finish.
Qt Creator will generate a basic project structure and files for your application. You can see them in the Projects pane on the left side of the IDE.
To edit your user interface, double-click on the .ui file (if using widgets) or the .qml file (if using Quick) in the Projects pane. This will open the Design mode where you can drag and drop widgets or items from the Library pane onto the Form Editor or QML Editor.
To edit your code, double-click on the main.cpp file in the Projects pane. This will open the Edit mode where you can write C++ code using the Code Editor. You can also use features such as syntax highlighting, code completion, refactoring, and debugging.
To run your application, click on documentation page, where you can find guides, tutorials, examples, references, and more.
The Qt forum, where you can ask questions, share experiences, and get answers from other Qt users and experts.
The Qt bug tracker, where you can report bugs, request features, and follow the development progress of Qt.
The Qt mailing lists, where you can subscribe to various topics and receive updates and announcements about Qt.
The Qt IRC channels, where you can chat with other Qt users and developers in real time.
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