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created the Massif-Visualizer, heaptrack and hotspot tools now used widely to improve C++ and Qt applications performance. The co-maintainer of the KDevelop IDE, in 2015 he won the KDE Akademy Award for ongoing work in that. Milian has a Masters Degree in Physics and lives in Berlin. He is fluent in English and German.

Efficient barcode scanning with QZXing Profiling Qt Zebras Crossing

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, or rather was, a big problem though: When you want to analyze a live camera video stream, e.g. from a phone camera, the latency can …

Heaptrack v1.0.0 Release First stable release of the fast Linux heap memory profiler

I’m extremely happy to finally announce the first stable release of heaptrack, the FOSS heap memory profiler for C/C++ Linux applications. You can download the source tarball from the KDE mirrors: https://download.kde.org/stable/heaptrack/1.0.0/src/

Heaptrack is a fast heap memory profiler that runs on Linux. It allows you to track all heap memory allocations at run-time. Afterwards, the accompanying GUI tool can be used to find optimization opportunities in your code by analyzing the recorded profiling data. It allows you to:

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Highlights of CppCon 2015

Oh my, how time flies by! One month ago, I had the pleasure to travel to Bellevue, Washington, to attend CppCon 2015. It was a blast, and as a C++ developer, easily the best conference I ever attended. Below, I try to summarize my personal highlights of the talks I attended live. Note however that there were up to six sessions running in parallel, meaning I missed most of the conference. Thankfully, nearly all sessions were recorded in high quality …

Qt and KDAB at CppCon 2015

For years now I have been watching the video recordings of talks from various C++ conferences across the globe. As a developer, they are an invaluable source of information and inspiration. I have fond memories of watching GoingNative 2012 in a live stream with some colleagues of mine in our office in Berlin. But, over the years, I was always missing something: Qt. Not a single talk at Going Native, CppCon, C++ Now or Meeting C++ targeted Qt …

Qt WebChannel – bridging the gap between C++/QML and the web

Hybrid applications, which mix a UI built with Qt Widgets or Qt Quick with embedded HTML websites, are very popular. In particular, something like an HTML 5 app framework is often requested by customers. Qt WebKit makes it trivial to embed HTML content in any graphical application. But how does one bridge the gap between C++/QML on one side, and HTML/JavaScript on the other side?

A bit of history

In the single-process world of the C++ Qt WebKit API, …

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