Clazy 1.4 has been released and brings 10 new checks. Clazy is a clang compiler plugin which emits warnings related to Qt best practices. We'll be showing Clazy at Qt World Summit in Boston, Oct 29-30, where we are a main Sponsor. You can read more about it in our previous blog posts: How to […]

There has been a lot of back and forth around the use of Free Software in public administration. One of the latest initiatives in this area was started by the Free Software Foundation Europe, FSFE. It focuses on the slogan: Public Money - Public Code. There are various usage scenarios for Free Software in public […]

After more than a year of work, I'm pleased to release another version of heaptrack, the Linux memory profiler! The new version 1.1.0 comes with some new features, significant performance improvements and - most importantly - much improved stability and correctness. If you have tried version v1.0 in the past and encountered problems, update to […]

KDAB is proud to be bronze sponsor at Italian C++ Conference, the largest conference in Italy specifically focused on C++ development for professionals, students and businesses using C++. It's free, organized by the Italian C++ community, and there's Italian icecream to think about too... It's an offer you can't refuse ;) Sign up and see […]

The Qt model/view APIs are used throughout Qt -- in Qt Widgets, in Qt Quick, as well as in other non-GUI code. As I tell my students when I deliver Qt trainings: mastering the usage of model/view classes and functions is mandatory knowledge, any non-trivial Qt application is going to be data-driven, with the data […]

Clazy is a Clang plugin which extends the compiler with over 50 warnings related to Qt best practices ranging from unneeded memory allocations to API misuse. It’s an opensource project spawned by KDAB’s R&D efforts for better C++ tooling. At KDAB, we have a pretty cool Continuous Integration infrastructure to take care of our customers’ […]

"I have also done some last minute performance improvements with the help of KDAB Hotspot/perf, and I must say that the days of profiling with weird/huge perf command line options are gone, awesome tool!" Hotspot is a KDAB R&D project to create a standalone GUI for performance data. It is a replacement for perf report. […]

Today I want to share 13 mistakes regarding signals, slots and connect statements and how to find them at compile time with clazy, our open-source static-analyzer for Qt. Clazy is a compiler plugin which generates warnings related to Qt. You can read more about it in our previous blog posts: How to use static analysis […]

Some of you may know that KDAB employees enjoy flexibility on working hours as well as location, and some choose to work from home, with the opportunity to share childcare, do part-time study or simply enjoy an out-of-the-way location. All that's required is a decent bandwidth for KDAB work. About once a year, all of […]

Introduction In the previous article we gave an overview of the process for creating a custom aspect and showed how to create (most of) the front end functionality. In this article we shall continue building our custom aspect by implementing the corresponding backend types, registering the types and setting up communication from the frontend to […]

Linux perf is an immensely useful and powerful tool suite for profiling of C/C++ applications. I have used it extensively and successfully on various customer projects, both for desktop applications as well as automotive or industrial projects targeting low-end embedded Linux targets running on ARM hardware. The biggest problem with perf really is its usability, […]

Introduction Qt 3D has a flexible and extensible architecture that allows us to easily add our own new functionality to it without disrupting the existing features. The functionality of Qt 3D is divided among so-called aspects, each of which encapsulates a particular subject domain such as rendering, input, or animation. This short series of articles […]

Clazy is a clang plugin which extends the compiler with over 50 warnings related to Qt best practices ranging from unneeded memory allocations to API misuse. It's an opensource project spawned by KDAB's R&D efforts for better C++ tooling. Today, we're proud to announce a Clazy Web UI to view all warnings emitted by Clazy, […]

Close to three months after the initial hotspot release, I'm happy to announce the release of version 1.1.0. Quick recap: Hotspot is a graphical frontend to the Linux perf profiler suite. It allows you to visually analyze perf.data files with the built-in Flame Graph and the Bottom-Up, Top-Down, or Caller-Callee data tables. It is a […]

An existing code base can be a great asset, but it can also be a liability. Technical debt tends to build up over time, eventually reaching the point where something needs to be done. KDAB has unique experience in migrations as well as specialized tools and in-depth knowledge from migration projects in different industries with […]

Introduction This article is part of a blog series about Clang Tidy. In the previous article we learned about the general usage of Clang Tidy to automatically refactor source code for projects using the CMake build system. In this particular episode we'll discuss using Clang Tooling on projects using different build systems with the help […]

In the previous episode we presented how to uncover 32 Qt best practices at compile time with clazy. Today it's time to show 5 more and other new goodies present in the freshly released clazy v1.2. New checks 1. connect-not-normalized Warns when the content of SIGNAL(), SLOT(), Q_ARG() and Q_RETURN_ARG() is not normalized. Using normalized […]

After many months of work, I'm very pleased to finally announce KDAB's latest R&D project to the public: hotspot - a GUI for the Linux perf profiler. I have used Linux perf a lot over the past years. It is an extremely powerful and useful tool. But its complexity makes it very hard to use. […]

Qt 5.9 has just been released! This release marks two important milestones for the Qt Project. The first is that now the Qt 5 series has had more releases than any other Qt version ever (the last release of the Qt 4 series was Qt 4.8). The second milestone is that Qt 5.9 will be […]

QZXing is a very useful library: It provides an easy to use Qt integration API around the barcode scanning library ZXing (zebras crossing). Because it is so easy to setup QZXing in a Qt application, we and most of our customers end up using it when they need to scan images for barcodes. There is, […]