- Qt 6.10
- Qt NFC
- C++ Classes
- QNdefMessage
- Qt 6.10.2 Reference Documentation

# QNdefMessage Class

The QNdefMessage class provides an NFC NDEF message. More...

Header: | `#include <QNdefMessage>`
CMake: | `find_package(Qt6 REQUIRED COMPONENTS Nfc)` `target_link_libraries(mytarget PRIVATE Qt6::Nfc)`
qmake: | `QT += nfc`
Since: | Qt 5.2

- List of all members, including inherited members

## Public Functions

| QNdefMessage()
| QNdefMessage(const QList<QNdefRecord> &records)
| QNdefMessage(const QNdefRecord &record)
| QNdefMessage(const QNdefMessage &message)
QByteArray | toByteArray() const
`(since 6.2)` QNdefMessage & | operator=(QNdefMessage &&other)
`(since 6.2)` QNdefMessage & | operator=(const QNdefMessage &other)
bool | operator==(const QNdefMessage &other) const

## Static Public Members

QNdefMessage | fromByteArray(const QByteArray &message)

## Detailed Description

A QNdefMessage is a collection of 0 or more QNdefRecords. QNdefMessage inherits from QList<QNdefRecord> and therefore the standard QList functions can be used to manipulate the NDEF records in the message.

NDEF messages can be parsed from a byte array conforming to the NFC Data Exchange Format technical specification by using the fromByteArray() static function. Conversely QNdefMessages can be converted into a byte array with the toByteArray() function.

## Member Function Documentation

### `[constexpr noexcept]` QNdefMessage::QNdefMessage()

Constructs a new empty NDEF message.

### QNdefMessage::QNdefMessage(const QList<QNdefRecord> &records)

Constructs a new NDEF message that contains all of the records in records.

### `[explicit]` QNdefMessage::QNdefMessage(const QNdefRecord &record)

Constructs a new NDEF message containing a single record record.

### `[noexcept]` QNdefMessage::QNdefMessage(const QNdefMessage &message)

Constructs a new NDEF message that is a copy of message.

### `[static]` QNdefMessage QNdefMessage::fromByteArray(const QByteArray &message)

Returns an NDEF message parsed from the contents of message.

The message parameter is interpreted as the raw message format defined in the NFC Data Exchange Format technical specification.

If a parse error occurs an empty NDEF message is returned.

### QByteArray QNdefMessage::toByteArray() const

Returns the NDEF message as a byte array.

The return value of this function conforms to the format defined in the NFC Data Exchange Format technical specification.

### `[noexcept, since 6.2]` QNdefMessage &QNdefMessage::operator=(QNdefMessage &&other)

Move assignment operator from QList<QNdefRecord>. Moves the other list of NDEF records to this NDEF record list.

After the operation, other will be empty.

This is an overloaded function.

This function was introduced in Qt 6.2.

### `[noexcept, since 6.2]` QNdefMessage &QNdefMessage::operator=(const QNdefMessage &other)

Copy assignment operator from QList<QNdefRecord>. Assigns the other list of NDEF records to this NDEF record list.

After the operation, other and `*this` will be equal.

This is an overloaded function.

This function was introduced in Qt 6.2.

### bool QNdefMessage::operator==(const QNdefMessage &other) const

Returns `true` if this NDEF message is equivalent to other; otherwise returns `false`.

An empty message (i.e. isEmpty() returns `true`) is equivalent to a NDEF message containing a single record of type QNdefRecord::Empty.