KDSingleApplication API Documentation 1.1
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KDSingleApplication is a helper class for single-instance policy applications written by KDAB.


Currently the documentation is woefully lacking, but see the examples or tests for inspiration. Basically it involves:

  1. Create a Q(Core|Gui)Application object.
  2. Create a KDSingleApplication object.
  3. Check if the current instance is primary (or "master") or secondary (or "slave") by calling isPrimaryInstance:
    • the primary instance needs to listen from messages coming from the secondary instances, by connecting a slot to the messageReceived signal;
    • the secondary instances can send messages to the primary instance by calling sendMessage.

See INSTALL.txt for installation instructions using CMake.


KDSingleApplication is © Klarälvdalens Datakonsult AB and is available under the terms of the MIT license.

Contact KDAB at info@.nosp@m.kdab.nosp@m..com if you need different licensing options.

Get Involved

KDAB will happily accept external contributions.

Please submit your contributions or issue reports from our GitHub space at https://github.com/KDAB/KDSingleApplication.

About KDAB

KDSingleApplication is supported and maintained by Klarälvdalens Datakonsult AB (KDAB).

The KDAB Group is the global No.1 software consultancy for Qt, C++ and OpenGL applications across desktop, embedded and mobile platforms.

The KDAB Group provides consulting and mentoring for developing Qt applications from scratch and in porting from all popular and legacy frameworks to Qt. We continue to help develop parts of Qt and are one of the major contributors to the Qt Project. We can give advanced or standard trainings anywhere around the globe on Qt as well as C++, OpenGL, 3D and more.

Please visit https://www.kdab.com to meet the people who write code like this.

Stay up-to-date with KDAB product announcements:

© Klarälvdalens Datakonsult AB (KDAB)
"The Qt, C++ and OpenGL Experts"
A helper class for single-instance policy Qt applications
Generated on Sat Apr 13 2024 00:10:51 for KDSingleApplication API Documentation by doxygen 1.9.8