- Qt 6.4
- Qt NFC
- C++ Classes
- QNdefMessage
- Qt 6.4.2 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(const QList<QNdefRecord> &records)
| QNdefMessage(const QNdefMessage &message)
| QNdefMessage(const QNdefRecord &record)
| QNdefMessage()
QNdefMessage & | operator=(QNdefMessage &&other)
QNdefMessage & | operator=(const QNdefMessage &other)
QByteArray | toByteArray() const
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

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

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

### QNdefMessage::QNdefMessage(const QNdefMessage &message)

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

### QNdefMessage::QNdefMessage(const QNdefRecord &record)

Constructs a new NDEF message containing a single record record.

### QNdefMessage::QNdefMessage()

Constructs a new empty NDEF message.

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

This is an overloaded function.

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 function was introduced in Qt 6.2.

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

This is an overloaded function.

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 function was introduced in Qt 6.2.

### `[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.

### 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.