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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

Ci vediamo alla Italian C++ Conference 2017?

(English speaking? Keep reading!)

Il prossimo Giugno parteciperò all’Italian C++ Conference 2017, la più importante conferenza italiana sul C++, sponsorizzata da KDAB.

L’evento è gratuito e si rivolge tanto ai programmatori esperti di C++ quanto a chi voglia avvicinarsi a questo linguaggio. L’edizione di quest’anno prevede due tracce, di cui una completamente in inglese, con ospiti internazionali d’eccezione: Phil Nash, Jens Weller, Bartosz Milewski e Dietmar Kühl.

L’appuntamento è per Sabato 17 …

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

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 …

Disabling narrowing conversions in signal/slot connections

A small new feature that I have added to Qt 5.8 is the possibility of disabling narrowing conversions in the new-style QObject::connect statement. In this short blog post I would like to share with you why I thought this was useful and therefore implemented it.

The problem

Since Qt 5.0, the new-style, PMF-based (pointer to member function-based) QObject::connect will check at compile time if the signal’s signature is compatible with the slot’s one.

For instance, let’s consider these two …

Safety critical drawing with OpenGL SC Making your OpenGL ES code OpenGL SC compliant

Bringing software into a safety critical environment can be tricky, especially when using the complex APIs needed for modern 3D graphics. That’s what makes OpenGL SC (Safety Critical) so important: it bridges the gap between beautiful displays and functional safety, while trying to remain as close to existing embedded standards that we all know and love. OpenGL SC will only become more prevalent in embedded graphics work as industries increasingly try to merge safety conscious methodologies with user-friendly interfaces.…

What do I do if a slot is not invoked? A practical checklist to debug your signal/slot connections

All Qt developers have asked themselves at least once in their careers: “why isn’t my slot invoked?” (I’ve asked myself that question many, many times).

There are a number of reasons why a connection may fail to be properly set up, and ultimately cause our slot not to be invoked. This blog post is a practical series of checks to help you debug these sorts of issues.

0. Was the slot really not invoked?

First and foremost, are we really …

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