Qt NFC

The NFC API provides connectivity between NFC enabled devices.

Currently the API is supported on Android and iOS.

Overview

NFC is an extremely short-range (less than 20 centimeters) wireless technology and has a maximum transfer rate of 424 kbit/s. NFC is ideal for transferring small packets of data when two devices are touched together.

The NFC API provides APIs for interacting with NFC Forum Tags and NFC Forum Devices, including target detection and loss, registering NDEF message handlers, reading and writing NDEF messages on NFC Forum Tags and sending tag specific commands.

Using the Module

Using a Qt module 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 components in the Qt6 package:

find_package(Qt6 COMPONENTS Nfc REQUIRED)
target_link_libraries(mytarget PRIVATE Qt::Nfc)

See also 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

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.

Related Information

Guides

• Qt NFC Overview
• Qt NFC on Android

Reference

• C++ Classes

Examples

• C++
  • Annotated URL
  • NDEF Editor