KDAB TV – Recent Videos KDAB's YouTube Channel: Qt, C++ and 3D tutorials, news and more

Jumping to the Right Qt Version

When you press Ctrl+k and type a class name, you are asked which version of Qt you want to see that documentation for.

99% of the time, the answer is likely "The latest". You can actually make it show the latest by default, but it is well hidden.

All Qt Widgets and more videos:
https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

About the host:
The video is presented by Jesper Pedersen, who started with Qt back when Qt was widgets only and the version was 1.44, which gives him 21 years of experience with Qt. Since 2000 he has taught almost 100 Qt classes, ranging from Qt Widgets to QML. Heck, Jesper even taught a few classes on QTopia Core — Trolltech's initial attempt at creating a phone stack. Today Jesper holds a fancy business title, but that doesn't prevent him from coding both in his job and in his spare time.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing and innovative software across embedded, mobile and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrolment courses around the world. We are the market leaders for training in Qt, OpenGL and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are over 100 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK and the USA. https://www.kdab.com/about/contact/

Inter-process Communication with Qt: Implementing a SOAP Client Using KDSoap

One of the standard communication protocols for web services is SOAP, which is basically XML over HTTP. I wrote an opensource library called KDSoap which makes it easy to do SOAP with Qt (both client-side and server-side).

In this video you will see how, starting from a web service which provides a WSDL file to describe its API, KDSoap can generate code to make synchronous or asynchronous calls to the web service.

The code shown in this video is the one for the application shown in Part 2. It can be found at https://github.com/KDAB/KDSoap/tree/master/examples/bank_gui

Links:
* KDSoap: https://github.com/KDAB/KDSoap

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

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KDAB News | Qt 6.8 LTS Release

Welcome to the KDAB News Flash, the update for developers working with desktop and embedded software such as Qt, C++, Rust and Linux.

KDAB has been contributing to Qt since its early days. In 2024, KDAB has contributed 859 patches to Qt.

In this edition, we have:

0:00 Introduction
0:18 Qt 6.8 LTS
2:40 Announcements

**

Here you find all the links mentioned in the News Flash:

Qt 6.8 LTS Release Blog
https://www.qt.io/blog/qt-6.8-released

Qt 6.8 LTS Documentation
https://doc.qt.io/qt-6/whatsnew68.html

Announcements

Meeting C++ 2024
https://meetingcpp.com/2024/

Embedded Software Engineering Kongress / ESE Kongress
https://ese-kongress.de/frontend/index.php

KDAB Training Schedule
https://training.kdab.com/scheduled-training/

About KDAB:
Trusted software excellence across embedded and desktop platforms

The KDAB Group is a globally recognized provider for software consulting, development and training, specializing in embedded devices and complex cross-platform desktop applications. In addition to being leading experts in Qt, C++ and 3D technologies for over two decades, KDAB provides deep expertise across the stack, including Linux, Rust and modern UI frameworks. https://www.kdab.com/software-services.

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++. https://training.kdab.com/

With 100+ employees from 20 countries and offices in Sweden, Germany, USA, France and UK, we serve clients around the world. https://www.kdab.com/about/contact/

32 7

Inter-process Communication with Qt: Implementing a REST Client Using QNetworkAccessManager

A very common communication protocol is REST, which is simply JSON over HTTP. Qt has all the building blocks for this, with QJsonDocument for JSON and QNetworkAccessManager for HTTP.

In this video, you will see a real-world library that makes REST requests to a web service called TMDB (movie database), as an example. The code for the TMBDQt library, used as an example in this video, can be found here: https://invent.kde.org/libraries/libtmdbqt.git

Links:
* Link to the "The Movie Database API": https://developer.themoviedb.org/reference/configuration-detail

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

12 6

Inter-process Communication with Qt: Using a Thread to Make Blocking DBus Calls

This video shows an alternative way to a DBus client using Qt, using the convenience of blocking calls but without blocking the GUI thread: all blocking calls are done in a separate thread.

For more details about event handling in a separate thread, and cross-thread communication with signals and slots, see my earlier video https://youtu.be/lTJ-QkC_Sxw?list=PL6CJYn40gN6jgr-Rpl3J4XDQYhmUnxb-g

Code shown in this video: https://github.com/KDABLabs/kdabtv/tree/master/InterProcessCommunication/DBusCommunication-using-thread

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

6 0

Inter-process Communication with Qt : Implementing an async DBus Client

This video shows how to implement a DBus client using Qt, using generated code so that calls and their signature are checked at compile time. Special care is taken not to block the GUI thread, using asynchronous handling only (via signals and slots, and a queue of pending requests).

Code shown in this video: https://github.com/KDABLabs/kdabtv/tree/master/InterProcessCommunication/DBusCommunication-async

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

4 0

Inter-process Communication with Qt: Implementing a DBus Server

This video shows how to implement a DBus server using Qt, in order to communicate between two processes. The benefits of using DBus include the fact that it's a standard communication protocol on Unix systems especially, and the ability for Qt to generate classes the client can use to make calls in a type-safe way. For now we'll test the server using the qdbus command-line client, the next video will show how to make calls from C++.

Code shown in this video: https://github.com/KDABLabs/kdabtv/tree/master/InterProcessCommunication/DBusCommunication-async

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

19 5

Inter-process Communication with Qt: Using a thread to make blocking calls over a socket

In this video, you will see an alternative to the asynchronous handling done in the previous video.
If the socket is managed by a separate thread, it becomes possible to implement the protocol in a synchronous manner, which is much easier. For more details about event handling in a separate thread, and cross-thread communication with signals and slots, see my earlier video: https://youtu.be/lTJ-QkC_Sxw?list=PL6CJYn40gN6jgr-Rpl3J4XDQYhmUnxb-g

The example shown here uses a local socket, but the code would be very similar if the two processes were on different machines, you would basically use QTcpServer and QTcpSocket instead of QLocalServer and QLocalSocket.

Code shown in this video: https://github.com/KDABLabs/kdabtv/tree/master/InterProcessCommunication/Sockets-part3-using-thread

Job Pattern video: https://www.youtube.com/watch?v=y1cYW7xMkpA

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

11 1

C++ Applications Architecture Best Practices: The Job Pattern

This video is private.

45 0

Inter-process Communication with Qt: Communicating over a Qt Socket Using JSON

In this video, you will learn how to use the JSON classes in Qt (5 or later) to implement a communication protocol between two processes. Special care is taken not to block the GUI thread in the graphical client application, using asynchronous handling only (via signals and slots, and a queue of pending requests).

Code shown in this video: https://github.com/KDABLabs/kdabtv/tree/master/InterProcessCommunication/Sockets-part2-with-JSON

All 'Inter-process communication with Qt' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jlyNTFcXhmOEht-CI7XZht

All 'Qt Widgets and more' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6gf-G-o6syFwGrtq3kItEqI

All 'QML Tips and Tricks' videos: https://www.youtube.com/playlist?list=PL6CJYn40gN6jWHP5krsQrVGyYtKh3A3be

About the host:
This video is presented by David Faure, who started with Qt back in 1998 in the KDE project where he's still very active. This gives him 22 years of experience with Qt. Since 2003 he has taught many Qt training courses, on topics such as Qt Widgets, Multithreading, Modern C++, and Debugging/Profiling on Linux. He has made many contributions to QtCore and QtDBus and has helped numerous customers, especially with Qt multithreading issues.

Every month our newsletter is featuring technical blogs on Qt, C++ and 3D topics: https://www.kdab.com/development-resources/sign-up-for-our-newsletter/

About KDAB:
KDAB offers experienced software experts to help you deliver functional, high-performing, and innovative software across embedded, mobile, and desktop platforms for projects using C++, Qt, QML/Qt Quick, OpenGL, Qt 3D, and more. https://www.kdab.com/software-services

KDAB experts regularly take time out to deliver KDAB’s world class training, in-house or at open enrollment courses around the world. We are the market leaders for training in Qt, OpenGL, and C++.

Contact us to find out more at training@kdab.com or visit our website: https://www.kdab.com/software-services/scheduled-training/

We are about 90 people, located all around the world. Our Head Office is in Sweden and we have other offices in Germany, France, the UK, and the USA. https://www.kdab.com/about/contact/

28 0