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GammaRay 2.8.0 Release

We have released version 2.8.0 of our Qt application introspection tool GammaRay. GammaRay allows you to observe behavior and data structures of Qt code inside your program live at runtime.

A big focus in this release is improvements to the Qt Quick inspector, which gained layout helper grids and Qt Quick Controls 2 tracing, as well as initial support for the software renderer. We have also optimized the performance of the remote view, which previously managed to saturate a …

Creating PDF/A documents with Qt

As there were some complex issues around conformity in PDF document creation within Qt, KDAB let me spend some time digging into it so we could make sure that Qt’s PDF engine generates documents up to ISO-standard.

Nowadays, many official institutions have the requirement to archive their data digitally and PDF is a first class citizen for this purpose. However, since the overall PDF standard is too complex, to guarantee that PDF documents can be rendered in their entirety in

KDAB contributions to Qt 5.9

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 a Long Term Support release, therefore providing to many users a stable foundation to build their applications upon.

KDAB has been a significant contributor to …

Ci vediamo a QtDay 2017?

With an apology to English-speaking audiences 🙂

Anche quest’anno KDAB partecipa a QtDay, la conferenza italiana interamente dedicata a Qt. Giunta oramai alla sua sesta edizione, QtDay continua a crescere. Quest’anno QtDay si articola in 3 giorni: il primo dedicato a un training su QML, seguito da due giorni di conferenza vera e propria.

Durante la conferenza terrò due interventi:

  • Venerdì 23 giugno parteciperò ad una tavola rotonda sul come contribuire allo sviluppo di Qt;
  • Sabato 24 giugno

Corso di Qt/QML per Embedded a Milano, settembre 2017

KDAB è lieta di annunciare una data italiana per il corso Programmazione Qt/QML per sistemi embedded, che si svolgerà a Milano dal 12 al 14 settembre 2017.

Qt è un application framework moderno e ricco di funzionalità, utilizzato per realizzare applicazioni cross-platform per sistemi embedded, mobile e desktop. Qt è usato da oltre 800.000 sviluppatori in tutto il mondo per creare interfacce di domotica e home automation; sistemi di in-vehicle infotainment (IVI); pannelli di controllo industriale; applicazioni desktop …

KDAB trainings at CppCon 2017

Registrations for CppCon 2017 have just opened!

CppCon is the annual conference for the C++ community: five days packed with amazing talks, inspiring keynotes, panel discussions, hallway chats, funny evening events and much more.

CppCon is a project of the Standard C++ Foundation, a not-for-profit organization whose purpose is to support the C++ software developer community and promote the understanding and use of modern, standard C++ on all compilers and platforms.

This year KDAB is proud to be hosting

QStringView Diaries: Masters Of The Overloads How QStringView actively manages implicit conversions

The last blog post in this series described how to use string-views. This post is about how to design one. In particular, it’s about QStringView‘s constructors. They evolved through a rapid succession of changes. These changes either fixed ambiguities between QString and QStringView overloads, or improved performance. And they all have the same solution: std::enable_if, the Swiss Army Knife for overload control.

This post will take you from where we naïvely started to where we made the impossible …

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 …

Uncovering 32 Qt best practices at compile time with clazy

In a previous blog post we introduced clazy, a clang plugin which makes the compiler understand Qt semantics, allowing you to get compile-time warnings about Qt best practices ranging from unneeded memory allocations to misuse of API, including fix-its for automatic refactoring.

Today we’ll do a round-up and present the checks related to connect statements, Qt containers (including QString) and misc Qt facilities.

Connects

1. old-style-connect

Finds connect() statements still using the old SIGNAL()/SLOT() syntax. The Qt …

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