New Features in Qt 6.2

New & Restored Modules

The following additional modules are available, that were not present in 6.1:

• Qt RemoteObjects
  • The Qt RemoteObjects module has been ported to Qt 6 and the CMake build system.

• Qt SerialBus
  • The Qt SerialBus module has been ported to Qt 6 and the CMake build system.
  • The QCanBusFactory has been removed and QCanBusFactoryV2 was renamed to QCanBusFactory.
  • QModbusRtuSerialSlave and QModbusRtuSerialMaster have been renamed to QModbusRtuSerialServer and QModbusRtuSerialClient and the new names shall be used in new code.

• Qt WebSockets
  • The Qt WebSockets module has been ported to Qt 6 and the CMake build system.

• Qt WebChannel
  • The Qt WebChannel module has been ported to Qt 6 and the CMake build system.
  • QWebChannel properties are now bindable.
  • The property update interval of QWebChannel can be configured. It still defaults to 50ms.
  • QWebChannel supports property updates for BINDABLE properties. However, the client side does not provide a generic callback mechanism if the host property does not have a NOTIFY signal.
  • Signals from objects living in a different thread are now handled correctly (QTBUG-51366)

• Qt WebEngine
  • The Qt WebEngine module has been ported to Qt 6 and the CMake build system.
  • The Qt WebEngine submodule for Qt Quick has been renamed from QtWebEngine to QtWebEngineQuick
  • Several classes have been moved from QtWebEngineWidgets to QtWebEngineCore including QWebEnginePage
  • Some functionality previously only accessible by deriving from QWebEnginePage can now be accessed using synchronous signals.

• Qt WebView
  • The Qt WebView module has been ported to Qt 6 and the CMake build system.

New Features (within existing modules)

QtGui

• Floating point image formats added to QImage for both 16-bit and 32-bit floats.
• Converting RGB images to, or painting RGB colors onto, grayscale images is now gamma corrected and produces in the luminance values of the input color space.

QtNetwork

• QSslSocket
  • TLS backends, that were previously (Qt 6.1) converted into plugin-like classes, now moved out of QtNetwork and became real plugins.
  • Several TLS backends may co-exist at runtime, for example, OpenSSL and Schannel, or OpenSSL and SecureTransport.

Porting guide

When creating Qt 6, we retain as much compatibility with Qt 5 as possible, but some changes were inevitable to make Qt a better framework. To make it easier to port to Qt 6, we have created a Porting guide to summarize those changes and provide guidance to handle them. In the guide, you can find links to articles about changes that may affect your application and help you transitioning from Qt 5 to Qt 6.