Qt NFC
The NFC API provides connectivity between NFC enabled devices.
Currently, the API is supported on Android, iOS and Linux using Neard v0.14 or later. This module also provides limited access to readers supporting PC/SC specification on Linux, macOS, and Windows.
NFC is a short-range (less than 20 centimeters) wireless technology with a maximum transfer rate of 424 Kbps. NFC is ideal for transferring small packets of data when two devices are placed together.
The NFC module provides APIs for interacting with NFC Forum Tags and NFC Forum Devices. It can detect targets and losses, register NDEF message handlers, read and write NDEF messages on NFC Forum Tags, and send tag-specific commands.
Using the Module
Using a Qt module's C++ API requires linking against the module library, either directly or through other dependencies. Several build tools have dedicated support for this, including CMake and qmake.
Building with CMake
Use the find_package() command to locate the needed module component in the Qt6 package:
find_package(Qt6 REQUIRED COMPONENTS Nfc)
target_link_libraries(mytarget PRIVATE Qt6::Nfc)
For more details, see the Build with CMake overview.
Building with qmake
To configure the module for building with qmake, add the module as a value of the QT variable in the project's .pro file:
QT += nfc
Articles and Guides
Logging Categories
The QtNfc module exports the following logging categories:
| Logging Category | Description |
|---|---|
| qt.nfc.neard | Enables logging of the Neard/Linux implementation |
Examples
Reference
Module Evolution
Changes to Qt NFC lists important changes in the module API and functionality that were done for the Qt 6 series of Qt.
Licenses
Qt NFC is available under commercial licenses from The Qt Company. In addition, it is available under free software licenses. Since Qt 5.4, these free software licenses are GNU Lesser General Public License, version 3, or the GNU General Public License, version 2. See Qt Licensing for further details.