03.09.2020 
We have just released version 1.2.0 of Heaptrack, the fast heap memory profiler for C++/Linux applications. A bit of Background The Heaptrack fast heap memory profiler allows you to track all heap memory allocations at run-time. Afterwards, you can use the accompanying GUI tool to find optimization opportunities in your code by analyzing the recorded […]
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Hotspot Version 1.3.0 Released Overview of New Features and Improvements
We are pleased to announce a new release of our Hotspot Linux perf performance analysis GUI, Hotspot version 1.3.0! Hotspot is a replacement for perf reportthat takes a perf.data file, parses and evaluates its contents, and then displays the result in a graphical form. You can read a bit more about Hotspot here: https://www.kdab.com/hotspot-gui-linux-perf-profiler/ Overview […]
Meeting C++ 2020 November 12 - 14
The Schedule, Talks and Speakers are now online for this ever growing ‘partly virtual ‘event for the European C++ community. KDAB is proud to be a Gold sponsor this year. This year’s online conference features eleven talks in one track. On November 14th you can see a talk from KDAB’s Marc Mutz: Partially-Formed Objects […]
Creating Python bindings for Qt libraries
Python is a handy all-purpose language. It can make you very productive within a short time period and has powerful expressiveness for data manipulation and processing. Yet, it’s not a great fit for lots of tasks. C++ is far better at achieving anything that needs bare metal performance, deterministic timing, or low-level access. Thankfully, some […]
Qt 3D will be ready for the Qt 6 release
Up until now, Qt 3D was relying on OpenGL for rendering. With the upcoming Qt 6, Qt will come with a rendering abstraction layer (Rendering Hardware Interface or RHI) to target not only OpenGL but also Vulkan, Metal and DirectX. We are in the process of adding RHI support to Qt 3D. This will allow […]
My file menu is not full of eels Or, why do my menus behave oddly on macOS when translated?
This is the story of a bug in an open-source project I maintain; as the maintainer I review and sometimes fix bug reports from the community. Last week, a user reported that the ‘File’ menu of the application was not appearing on macOS. Some investigation showed this didn’t happen when using the default translation (i.e […]
Fixing a common antipattern when loading translations in Qt
TL;DR: If you choose a default translation in your Qt application based on a locale name like this: then please change it to: Some of your users (me!) will be thankful that your application appears in the same language as the rest of their system. Background I’m a Polish guy working with computers, mostly on […]
Why is my screen dark A digestible blog on common render issues and what their cause could be
Part 3 If you are here from Part 1, you missed Part 2, somehow. It’s a night scene You have tried everything from the first two parts that seemed applicable, and your screen is still a window to the void? No problem: we’ve gathered another five reasons this could be happening and how to go […]
How to declare a qHash overload
Today’s blog post is about something that should be simple and apparently it causes trouble: how to declare a qHash overload for a custom datatype. This is necessary when we want to use custom datatypes as keys in a QHash. From the documentation: A QHash’s key type has additional requirements other than being an assignable […]
QStringView Diaries: Zero-Allocation String Splitting QStringTokenizer merged for 6.0
After four months of intensive development work, I am happy to announce that the first QStringTokenizer commits have landed in what will eventually become Qt 6.0. The docs should show up, soon. While the version in Qt will be Qt 6-only, KDAB will release this tool for Qt 5 as part of its KDToolBox productivity […]