Every now and then, when I submit some code for a code review, people tell me that I forgot qAsConst. Now I have one more enemy, namely: Clazy! It has also started saying this, and I guess it's about time for me to figure out what is going on. When do I need qAsConst and […]
In this video we discuss the two most used Qt containers: QList and QVector. How do they work? Are they similar to the std counterparts? What has changed in Qt 6 regarding them?
All Qt containers have a specific feature: they are "implicitly shared", also known as "copy on write". What does that mean exactly? What are the advantages for developers who use these containers? Are there any downsides?
This episode of KDAB News includes: Interview with new Qt Chief Maintainer Volker Hilsheimer; Qt World Summit 2022; Tip of the month, and Announcements.
Containers are data structures that hold arbitrary amounts of data (lists, maps, etc.). Qt ships with its own container family even though C++ and Python have their own. This video series answers: What are Qt containers' features? Should you use them? How do they differ from C++ Standard Library containers? What changed between Qt 5 and Qt 6?
In this blog on debugging and profiling, I would like to give you an overview of the debugging tools that exist for C and C++ applications. Automated Testing The first thing you need to do is make sure your code is properly tested. This, in itself, is not debugging, but it enables you to make […]
This 'Insights' series video interviews Bruno Coudoin, creator and founder of GCompris, about what inspired him and the software's success. GCompris is free, open-source educational software for kids aged 2-10, built with Qt. Topics include his motivation, open-source approach, development challenges, family support, contributors, project handover, and seeing governments adopt GCompris in school curricula.
When making large code changes, you want to validate there are no side effects. While unit testing is ideal and Squish tests are good, both may be unrealistic. A "better than nothing" solution is running original and modified applications side-by-side and comparing them. This small application easily takes screenshots of each and compares them.
KDAB will be Gold sponsors at this year’s free online edition of Qt World Summit on November 9th, 2022. Our very own Jesper Pedersen will present his talk “Highlights from Qt Widgets and More”. Don’t miss out! Join developers, designers, managers, and executives to get inspired by the latest developments with Qt. Register now and […]
The Closing Keynote to QtDevCon22 from Matthias Dalheimer, Founder, president and CEO of KDAB
I will be talking about text in this post, specifically about cases where you have to handle a lot of it. We are not talking about a general solution, but a specific case that we encountered during a customer project. The Problem The project involved showing a chat room for internal communication. We developed a […]
Many Windows C++ applications use MFC for UI, but Qt offers more modern tools including intuitive APIs, better modern C++ integration, and designer/localization tools. However, migrating large MFC codebases is time-consuming, and while some Qt modules integrate seamlessly, UI-related modules present incompatibilities (like QDialog not being modal for MFC applications). Find out more in this session.
This series often steps into Qt source code to diagnose problems, which is invaluable for understanding issues behind the scenes. However, the source code contains obstacles like Q_D macros and mysterious d and q variables that aren't immediately clear.
For a while, I thought Qt Creator's rename symbols and grep had a bug when they didn't find all occurrences. After filing a bug report, I learned it's actually a feature - you need to add all header files to CMakeLists.txt for it to work properly. This video shows how to fix your CMakeLists.txt files.
Your Qt / C++ application is feature complete, you fixed all the bugs, and your unit-tests pass! Time to ship it and get on with your life. Unfortunately, then you start to get reports that it crashes for some people, sometimes, on some machines. But they can’t remember what they were doing. Or know what version they were running. Or whether they’re running macOS or Windows.
During the talk, I will convince you that CI/CD setup is crucial to achieving strategic objectives, especially for long-term projects. You will learn what are the challenges that you can face while building your own setup, what tools to use, and what steps should be executed in CI/CD pipelines to ensure that your app meets quality criteria.
Qt Design Studio bridges the gap between designers and developers by making designer visions compatible with development tools. This graphical editor for Qt Quick and QML includes a free community version for non-commercial users and is available for Linux.
This talk presents Unicode string handling foundations in Qt. We'll explain the Unicode standard, why it's necessary for user interfaces, and discuss Qt's low-level classes (QChar, QString) and how they map to Unicode concepts. We'll cover Qt's higher-level facilities including collation, grapheme cluster iteration, and locale-aware formatting—all essential for proper user interfaces.
Crowdsourced QA is rising due to faster time-to-market, reduced costs, higher quality, and increased release confidence. However, disadvantages exist, like lacking code coverage information from testers. This doesn't mean black-box testing and code coverage are mutually exclusive.
In the current software development landscape, low-code and no-code application frameworks are gaining traction, as they allow non-developer professionals (such as designers and domain experts) to directly contribute to digital products.
