Qt 5.2 Over 1 Million Downloads

Published Wednesday April 16th, 2014 | by

Congrats everyone! Since its release in December 2013, Qt 5.2 has been downloaded over 1 million times. That is pretty darn awesome with about 10K downloads ticking in daily. Nice! Thanks to all for your support in spreading the Qt love. Let’s keep it kicking. Qt 5.3 is just around the corner where we hope to convert even more devs to the Qt world.

This figure really shows Qt as a key player in the software development world with a strong community behind it. The opportunity with Qt for hobby developers and large enterprise projects is evident via our fast-growing ecosystem. Qt’s use in 70+ industries and the large amount of market-leading Qt-powered applications and devices has an even larger potential for monetization and other new opportunities for all of us. Thanks again for the support and keep the conversation going with us. Let us  know what we can do better or more of to spread the use of Qt everywhere.

We welcome your feedback!

P.S. Remember to take the 2014 7th Edition Developer Economics Survey and stand up for Qt (and maybe win some nice prizes while you are at it): http://www.vmob.me/DE3Q14Digia

And, if you are really into taking surveys, help Qt move up the ranks in the Research2Guidance Cross-Platform Tools survey: http://research2guidance.com/cross-platform-tool-benchmarking-2014-take-part-and-get-your-valuable-reward-right-after-the-survey/


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Posted in Community, growth, Qt, Uncategorized

Qt Creator 3.1.0 released

Published Tuesday April 15th, 2014 | by

We are happy to announce the release of Qt Creator 3.1.0! This release of Qt Creator is packed with bug fixes and improvements, not to forget some new experimental features.

We finally integrated a Clang-based C/C++ code model as an option for code completion and semantic highlighting. It is experimental so far, so you need to enable the plugin in Help > About Plugins > C++ > ClangCodeModel, restart Qt Creator, and tell it to actually use it in Options > C++ > Code Model. We are interested in your feedback on how well it works. Please report issues on our bug tracker or get in contact with us on the mailing list or irc.

iOS support has moved out of experimental state, and fully supports QML debugging and profiling now. Also, several issues with debugging have been fixed, and many little things were tweaked (for example, you can now set the simulated device in the simulator run configuration).

In exchange we added a new experimental plugin for another platform: WinRT. You can read more about it in its own blog post here.

An important note is, that we drop support for debugging with versions of GDB that do not have a Python interface. This includes the version of GDB that is shipped with older versions of Xcode on Mac OS X. The good news there is, that we put a lot of effort into making debugging with LLDB a great experience in Qt Creator, so you should just use LLDB instead :)

Also notable is the experimental Beautifier plugin, which allows you to apply different external source code formatters on your files. It currently has support for Artistic Style, Clang-format and Uncrustify. Many thanks to Lorenz Haas for contributing this!

Additionally, Android support has received many tweaks again, including some minimal support for editing Java files with highlighting, indentation and keyword completion. You can now manage debug tokens and runtime configurations for QNX from Qt Creator, and debugging on QNX now supports more pretty printers as well. The QML Profiler and Qt Quick Designer have received many fixes, the Qt Quick Application templates have been simplified, support for qrc has been polished (for example, qrc files now appear as nodes in the project tree), and much much more. You find a more thorough overview in our change log.

Qt Creator 3.1.0 is part of the Qt Enterprise Embedded update today, and it will appear as an update in your Qt online installer (this may take a bit while it is rolled out to the mirrors). The Qt Creator open source standalone packages are also available on the Qt Project download page, and Enterprise Customers find them in the Qt Account Portal.


Posted in Qt, QtCreator, Releases

Qt Creator 3.1 RC1 released

Published Thursday April 3rd, 2014 | by

We are happy to announce the Qt Creator 3.1 RC1 release today. We have been fixing lots of bugs during the weeks since the beta, and think that we are now almost ready. So, this is the call to all of you, to give it a try, and give us some more feedback!

If you haven’t followed the beta release, I highly recommend reading the corresponding blog post for some information about the new features in Qt Creator 3.1. There are two features in 3.1 that I haven’t mentioned there, and which I’d like to highlight here:

We ship a new, experimental plugin for WinRT development (only available on Windows). You can read more about it in its own blog post here.

The iOS plugin went out of experimental state, and is enabled by default now (only available on Mac OS X). It now supports QML debugging and profiling, and many things have been fixed and tweaked, for example you can set the simulated device in your simulator run configurations now.

You find the opensource version on the Qt Project download page, and Enterprise Customers find their package in the Qt Account Portal. Please post issues in our bug tracker. You also can find us on IRC on #qt-creator on irc.freenode.net, and on the Qt Creator mailing list.


Posted in Qt, QtCreator, Releases

Qt Weekly #4: Benchmarking Code

Published Thursday April 3rd, 2014 | by

Qt provides several built-in ways to benchmark the runtime costs of code. Let’s have a quick glance at the most common ones.

There comes a time in every non-trivial application when performance starts to matter. In fact, it’s common for developers to pro-actively try to mitigate this by doing micro-optimizations, and aiming for optimized coding patterns based on ‘common wisdom’. However, hardware and compilers evolve, and soon you’ll get long discussions at the coffee machine about the best way to iterate, to pass arguments, and so on – and whether it matters in the end.

Wouldn’t it be cool to come up with some hard data in these cases? Qt provides a few simple ways to measure timing characteristics of code.

Qt Test library

The Qt Test library makes it very easy to create a benchmark. Even more so if you’re using the “Other Project/Qt Unit Test” project wizard in Qt Creator to let you generate the stub code that is needed. Then you’ve to just add the lines to be benchmarked inside the QBENCHMARK macro:

void BenchmarkTest::testCase1()
// code to benchmark goes here

Read more…

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Posted in Performance, Qt | Tags: , ,

Qt Weekly #2: Localizing Qt Quick Apps

Published Wednesday March 19th, 2014 | by

Most people feel more comfortable using applications in their native language. To attract as many users as possible for your apps, you should localize the apps to the languages spoken by the users in the regions that you target. Qt makes this easy by providing tools for localizing C++ and Qt Quick apps into local languages.

Let’s use the Quick Forecast app to illustrate the steps in localizing apps.

Quick Forecast app in English

Quick Forecast app in English

If you want to try running Quick Forecast yourself:

Read more…


Posted in C++, Qt | Tags:

Clarifications to Qt Trademark Fair Use Policy

Published Tuesday March 18th, 2014 | by

The use of Qt is on an upward spiral and a great deal of activity is visible with hundreds of Qt-powered products on the market today, scores of Qt learning books and various global Qt activities taking place on a constant basis. We are grateful for the support with pushing Qt forward. In that respect, in order to make sure that the Qt brand is represented consistently and within the terms of the Qt fair use policy and the Qt Trademark policy, I would like to remind you of a few guidelines that need to be followed and clarify a few items to make sure your use of the Qt name and the logo is used correctly.

The use of Qt trademarks is governed by trademark policy, brand guidelines, and trademark license. These are created in order to keep the Qt brand consistent and protect it from misuse. We have recently noticed that in some cases people are not well aware what is allowed and what is prohibited by the trademark policy. We, therefore, would like to clarify the fair use policy a bit.
Read more…


Posted in Community, Licensing, Open Governance, Qt

Qt Weekly #1: Categorized Logging

Published Tuesday March 11th, 2014 | by

Categorized logging allows you to structure your logging statements into categories, and to conveniently configure logging for individual categories in a central place. The feature is part of Qt 5.2, but will get some convenient extensions in Qt 5.3.

Since the dawn of times Qt has had it’s own little logging helpers – qDebug(), qWarning(), qCritical(), and qFatal(). Being part of QtCore, they are ubiquitous, also in the Qt code itself. Anyhow, the problem with logging is often enough that you’re doing too much of it (you get flooded with output), too few (you do not get enough to e.g. debug a problem), or both … In Qt 5.2 we started to address this by letting you split your logging messages into “categories”, and with Qt 5.3 there will finally be an easy, default way to enable output for these rules, through a configuration file.

Logging Categories

Let’s have a look at an example. Say you’re working on an awsome new game named “FlappyCat”, which features a high score:

bool Highscore::load(const QString &filepath)
    QLoggingCategory fcIo("fc.io");
    qCDebug(fcIo) << "Loading highscore ...";

    QFile file(filepath);
    if (!file.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qCWarning(fcIo) << "Could not open file " << filepath << "!";
    // ...

which prints:

fc.io: Loading highscore ...
fc.io: Could not open file  "highscore.xml" !

So, what’s happening here?
Read more…


Posted in C++, Qt | Tags: ,

Experimental Version of Qt Creator’s WinRT Plugin

Published Wednesday March 5th, 2014 | by

As many of you might have heard, we released Qt Creator’s 3.1 beta version on March 4th. While a lot of new things were mentioned in the blog post here, we still have something more to tell you about. The first version of our new WinRT plugin is now up and running – and already available in Qt Creator 3.1 beta. While there are still things that do not work yet, it is a great start and a lot of functionality is already covered.

The main features that already work nicely are:

  • Registration of Windows Runtime and Windows Phone Qt versions
  • Support for Windows Runtime and Windows Phone Kits
  • Building of Windows Runtime and Windows Phone applications
  • Running of applications for Windows Runtime and Windows Phone via Qt Creator’s “Run” button

Read more…


Posted in Mobile, Qt, QtCreator, Windows

Qt Creator 3.1 beta released

Published Tuesday March 4th, 2014 | by

We proudly present the Qt Creator 3.1 beta release today. This release introduces new features, as well as a whole bunch of bug fixes and improvements. About 1100 changes went into our repository since the 3.0.1 release, from around 45 authors. Many thanks to all who contributed so far!

Reading the git log is a bit boring (believe me ;) ), so you find a summary in our change log, and I’ll highlight a few things here.

I think one of the most important things is that we finally integrated experimental support for a Clang-based C++ model. You might know that Qt Creator has its own code model, which has for example the advantage that it is very fast, but the disadvantage that this is traded for some correctness. You might also know that Clang, the LLVM front-end for C/C++/Objective-C/Objective-C++ provides a library that can be used to integrate it, for example, into IDEs. That has the advantage that it is correct (after all it’s the base for a compiler), but the disadvantage that it is not very fast. We have been talking about integrating Clang into Qt Creator for a long time, and also had an experimental branch for it, and now we finally have integrated it as an option into Qt Creator.
Read more…


Posted in Qt, QtCreator, Releases

Qt 5.3 Alpha Available

Published Thursday February 27th, 2014 | by

I’m happy to announce that Qt 5.3 Alpha is available for download. Qt 5.3 is coming out a bit earlier than our regular 6-month release cycle would’ve forecasted, as we have decided to pull forward our release cycle meaning, starting from Qt 5.3, future Qt releases are planned to happen every Spring and Autumn.

The focus for Qt 5.3 is mainly about improving the stability, performance and first-time user experience of the product. A lot of the work over the past months has been focusing on improving the quality of Qt, especially on the mobile platforms and Mac OS X. Having said that, Qt 5.3 will also offer a good amount of new and exciting features, and a new platform: WinRT/Windows Phone!

New features

One of the main new features in Qt 5.3 is an improved integration between Qt Widgets and Qt Quick. The new QQuickWidget class allows  seamless integration of Qt Quick-based user interfaces with a Qt Widget-based application. This should significantly simplify using both technologies together in one application and provides an easy way to migrate Qt Quick into existing Qt Widgets applications.

Qt Network gained support for the SPDY protocol, speeding up of web content download in Qt WebKit and through QNetworkAccessManager. A new Qt WebSockets module got added featuring full support for web socket (RFC 6455).
Read more…


Posted in Qt, Releases

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