QBluetoothSocket Class Reference

\inmodule QtBluetooth More...

#include <qbluetoothsocket.h>

Inheritance diagram for QBluetoothSocket:

Collaboration diagram for QBluetoothSocket:

Public Types
enum class	SocketState {   UnconnectedState , ServiceLookupState , ConnectingState , ConnectedState ,   BoundState , ClosingState , ListeningState }
	This enum describes the state of the Bluetooth socket. More...
enum class	SocketError {   NoSocketError , UnknownSocketError , RemoteHostClosedError , HostNotFoundError ,   ServiceNotFoundError , NetworkError , UnsupportedProtocolError , OperationError ,   MissingPermissionsError }
	This enum describes Bluetooth socket error types. More...
Public Types inherited from QIODeviceBase
enum	OpenModeFlag {   NotOpen = 0x0000 , ReadOnly = 0x0001 , WriteOnly = 0x0002 , ReadWrite = ReadOnly | WriteOnly ,   Append = 0x0004 , Truncate = 0x0008 , Text = 0x0010 , Unbuffered = 0x0020 ,   NewOnly = 0x0040 , ExistingOnly = 0x0080 }
	This enum is used with QIODevice::open() to describe the mode in which a device is opened. More...

Signals
void	connected ()
	This signal is emitted when a connection is established.
void	disconnected ()
	This signal is emitted when the socket is disconnected.
void	errorOccurred (QBluetoothSocket::SocketError error)
	This signal is emitted when an error occurs.
void	stateChanged (QBluetoothSocket::SocketState state)
	This signal is emitted when the socket state changes to state.
Signals inherited from QIODevice
void	readyRead ()
	This signal is emitted once every time new data is available for reading from the device's current read channel.
void	channelReadyRead (int channel)
void	bytesWritten (qint64 bytes)
	This signal is emitted every time a payload of data has been written to the device's current write channel.
void	channelBytesWritten (int channel, qint64 bytes)
void	aboutToClose ()
	This signal is emitted when the device is about to close.
void	readChannelFinished ()
Signals inherited from QObject
void	destroyed (QObject *=nullptr)
	This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
void	objectNameChanged (const QString &objectName, QPrivateSignal)
	This signal is emitted after the object's name has been changed.

Public Member Functions
	QBluetoothSocket (QBluetoothServiceInfo::Protocol socketType, QObject *parent=nullptr)
	Constructs a Bluetooth socket of socketType type, with parent.
	QBluetoothSocket (QObject *parent=nullptr)
	Constructs a Bluetooth socket with parent.
virtual	~QBluetoothSocket ()
	Destroys the Bluetooth socket.
void	abort ()
	Aborts the current connection and resets the socket.
void	close () override
	Disconnects the socket's connection with the device.
bool	isSequential () const override
	\reimp
qint64	bytesAvailable () const override
	Returns the number of incoming bytes that are waiting to be read.
qint64	bytesToWrite () const override
	Returns the number of bytes that are waiting to be written.
bool	canReadLine () const override
	Returns true if you can read at least one line from the device.
void	connectToService (const QBluetoothServiceInfo &service, OpenMode openMode=ReadWrite)
	Attempts to connect to the service described by service.
void	connectToService (const QBluetoothAddress &address, const QBluetoothUuid &uuid, OpenMode openMode=ReadWrite)
	Attempts to make a connection to the service identified by uuid on the device with address address.
void	connectToService (const QBluetoothAddress &address, quint16 port, OpenMode openMode=ReadWrite)
	Attempts to make a connection with address on the given port.
void	connectToService (const QBluetoothAddress &address, QBluetoothUuid::ServiceClassUuid uuid, OpenMode mode=ReadWrite)
void	disconnectFromService ()
	Attempts to close the socket.
QString	localName () const
	Returns the name of the local device.
QBluetoothAddress	localAddress () const
	Returns the address of the local device.
quint16	localPort () const
	Returns the port number of the local socket if available, otherwise returns 0.
QString	peerName () const
	Returns the name of the peer device.
QBluetoothAddress	peerAddress () const
	Returns the address of the peer device.
quint16	peerPort () const
	Return the port number of the peer socket if available, otherwise returns 0.
bool	setSocketDescriptor (int socketDescriptor, QBluetoothServiceInfo::Protocol socketType, SocketState socketState=SocketState::ConnectedState, OpenMode openMode=ReadWrite)
	Sets the socket to use socketDescriptor with a type of socketType, which is in state socketState, and mode openMode.
int	socketDescriptor () const
	Returns the platform-specific socket descriptor, if available.
QBluetoothServiceInfo::Protocol	socketType () const
	Returns the socket type.
SocketState	state () const
	Returns the current state of the socket.
SocketError	error () const
	Returns the last error.
QString	errorString () const
	Returns a user displayable text string for the error.
void	setPreferredSecurityFlags (QBluetooth::SecurityFlags flags)
	Sets the preferred security parameter for the connection attempt to flags.
QBluetooth::SecurityFlags	preferredSecurityFlags () const
	Returns the security parameters used for the initial connection attempt.
Public Member Functions inherited from QIODevice
	QIODevice ()
	Constructs a QIODevice object.
	QIODevice (QObject *parent)
	Constructs a QIODevice object with the given parent.
virtual	~QIODevice ()
	The destructor is virtual, and QIODevice is an abstract base class.
QIODeviceBase::OpenMode	openMode () const
	Returns the mode in which the device has been opened; i.e.
void	setTextModeEnabled (bool enabled)
	If enabled is true, this function sets the \l Text flag on the device; otherwise the \l Text flag is removed.
bool	isTextModeEnabled () const
	Returns true if the \l Text flag is enabled; otherwise returns false.
bool	isOpen () const
	Returns true if the device is open; otherwise returns false.
bool	isReadable () const
	Returns true if data can be read from the device; otherwise returns false.
bool	isWritable () const
	Returns true if data can be written to the device; otherwise returns false.
virtual bool	isSequential () const
	Returns true if this device is sequential; otherwise returns false.
int	readChannelCount () const
int	writeChannelCount () const
int	currentReadChannel () const
void	setCurrentReadChannel (int channel)
int	currentWriteChannel () const
void	setCurrentWriteChannel (int channel)
virtual bool	open (QIODeviceBase::OpenMode mode)
	Opens the device and sets its OpenMode to mode.
virtual void	close ()
	First emits aboutToClose(), then closes the device and sets its OpenMode to NotOpen.
virtual qint64	pos () const
	For random-access devices, this function returns the position that data is written to or read from.
virtual qint64	size () const
	For open random-access devices, this function returns the size of the device.
virtual bool	seek (qint64 pos)
	For random-access devices, this function sets the current position to pos, returning true on success, or false if an error occurred.
virtual bool	atEnd () const
	Returns true if the current read and write position is at the end of the device (i.e.
virtual bool	reset ()
	Seeks to the start of input for random-access devices.
virtual qint64	bytesAvailable () const
	Returns the number of bytes that are available for reading.
virtual qint64	bytesToWrite () const
	For buffered devices, this function returns the number of bytes waiting to be written.
qint64	read (char *data, qint64 maxlen)
	Reads at most maxSize bytes from the device into data, and returns the number of bytes read.
QByteArray	read (qint64 maxlen)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Reads at most maxSize bytes from the device, and returns the data read as a QByteArray.
QByteArray	readAll ()
	Reads all remaining data from the device, and returns it as a byte array.
qint64	readLine (char *data, qint64 maxlen)
	This function reads a line of ASCII characters from the device, up to a maximum of maxSize - 1 bytes, stores the characters in data, and returns the number of bytes read.
QByteArray	readLine (qint64 maxlen=0)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Reads a line from the device, but no more than maxSize characters, and returns the result as a byte array.
virtual bool	canReadLine () const
	Returns true if a complete line of data can be read from the device; otherwise returns false.
void	startTransaction ()
void	commitTransaction ()
void	rollbackTransaction ()
bool	isTransactionStarted () const
qint64	write (const char *data, qint64 len)
	Writes at most maxSize bytes of data from data to the device.
qint64	write (const char *data)
qint64	write (const QByteArray &data)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Writes the content of data to the device.
qint64	peek (char *data, qint64 maxlen)
QByteArray	peek (qint64 maxlen)
qint64	skip (qint64 maxSize)
virtual bool	waitForReadyRead (int msecs)
	Blocks until new data is available for reading and the readyRead() signal has been emitted, or until msecs milliseconds have passed.
virtual bool	waitForBytesWritten (int msecs)
	For buffered devices, this function waits until a payload of buffered written data has been written to the device and the bytesWritten() signal has been emitted, or until msecs milliseconds have passed.
void	ungetChar (char c)
	Puts the character c back into the device, and decrements the current position unless the position is 0.
bool	putChar (char c)
	Writes the character c to the device.
bool	getChar (char *c)
	Reads one character from the device and stores it in c.
QString	errorString () const
	Returns a human-readable description of the last device error that occurred.
Public Member Functions inherited from QObject
Q_INVOKABLE	QObject (QObject *parent=nullptr)
	Constructs an object with parent object parent.
virtual	~QObject ()
	Destroys the object, deleting all its child objects.
virtual bool	event (QEvent *event)
	This virtual function receives events to an object and should return true if the event e was recognized and processed.
virtual bool	eventFilter (QObject *watched, QEvent *event)
	Filters events if this object has been installed as an event filter for the watched object.
QString	objectName () const
Q_WEAK_OVERLOAD void	setObjectName (const QString &name)
	Sets the object's name to name.
void	setObjectName (QAnyStringView name)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBindable< QString >	bindableObjectName ()
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false.
bool	isWindowType () const
	Returns true if the object is a window; otherwise returns false.
bool	isQuickItemType () const
	Returns true if the object is a QQuickItem; otherwise returns false.
bool	signalsBlocked () const noexcept
	Returns true if signals are blocked; otherwise returns false.
bool	blockSignals (bool b) noexcept
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
QThread *	thread () const
	Returns the thread in which the object lives.
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children.
int	startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
	This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
int	startTimer (std::chrono::milliseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
void	killTimer (int id)
	Kills the timer with timer identifier, id.
template<typename T >
T	findChild (const QString &aName=QString(), Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
template<typename T >
QList< T >	findChildren (const QString &aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
template<typename T >
QList< T >	findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
const QObjectList &	children () const
	Returns a list of child objects.
void	setParent (QObject *parent)
	Makes the object a child of parent.
void	installEventFilter (QObject *filterObj)
	Installs an event filter filterObj on this object.
void	removeEventFilter (QObject *obj)
	Removes an event filter object obj from this object.
QMetaObject::Connection	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
bool	disconnect (const QObject *receiver, const char *member=nullptr) const
void	dumpObjectTree () const
	Dumps a tree of children to the debug output.
void	dumpObjectInfo () const
	Dumps information about signal connections, etc.
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value.
bool	setProperty (const char *name, QVariant &&value)
QVariant	property (const char *name) const
	Returns the value of the object's name property.
QList< QByteArray >	dynamicPropertyNames () const
QBindingStorage *	bindingStorage ()
const QBindingStorage *	bindingStorage () const
QObject *	parent () const
	Returns a pointer to the parent object.
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.

Protected Member Functions
qint64	readData (char *data, qint64 maxSize) override
	\reimp
qint64	writeData (const char *data, qint64 maxSize) override
	\reimp
void	setSocketState (SocketState state)
	Sets the socket state to state.
void	setSocketError (SocketError error)
	Sets the type of error that last occurred to error_.
void	doDeviceDiscovery (const QBluetoothServiceInfo &service, OpenMode openMode)
	Start device discovery for service and open the socket with openMode.
Protected Member Functions inherited from QIODevice
	QIODevice (QIODevicePrivate &dd, QObject *parent=nullptr)
virtual qint64	readData (char *data, qint64 maxlen)=0
	Reads up to maxSize bytes from the device into data, and returns the number of bytes read or -1 if an error occurred.
virtual qint64	readLineData (char *data, qint64 maxlen)
	Reads up to maxSize characters into data and returns the number of characters read.
virtual qint64	skipData (qint64 maxSize)
virtual qint64	writeData (const char *data, qint64 len)=0
	Writes up to maxSize bytes from data to the device.
void	setOpenMode (QIODeviceBase::OpenMode openMode)
	Sets the OpenMode of the device to openMode.
void	setErrorString (const QString &errorString)
	Sets the human readable description of the last device error that occurred to str.
Protected Member Functions inherited from QObject
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
int	senderSignalIndex () const
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal.
bool	isSignalConnected (const QMetaMethod &signal) const
virtual void	timerEvent (QTimerEvent *event)
	This event handler can be reimplemented in a subclass to receive timer events for the object.
virtual void	childEvent (QChildEvent *event)
	This event handler can be reimplemented in a subclass to receive child events.
virtual void	customEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive custom events.
virtual void	connectNotify (const QMetaMethod &signal)
virtual void	disconnectNotify (const QMetaMethod &signal)
	QObject (QObjectPrivate &dd, QObject *parent=nullptr)
Protected Member Functions inherited from QIODeviceBase
	~QIODeviceBase ()=default

Protected Attributes
QBluetoothSocketBasePrivate *	d_ptr
Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Friends
class	QBluetoothServer
class	QBluetoothServerPrivate
class	QBluetoothSocketPrivateDarwin
class	QBluetoothSocketPrivateAndroid
class	QBluetoothSocketPrivateBluez
class	QBluetoothSocketPrivateBluezDBus
class	QBluetoothSocketPrivateDummy
class	QBluetoothSocketPrivateWin
class	QBluetoothSocketPrivateWinRT
class	QLowEnergyControllerPrivateBluez

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe
Static Public Member Functions inherited from QObject
static QMetaObject::Connection	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	\threadsafe
static QMetaObject::Connection	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1 , typename Func2 >
static QMetaObject::Connection	connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	\threadsafe
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static bool	disconnect (const QMetaObject::Connection &)
	Disconnect a connection.
template<typename Func1 , typename Func2 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
template<typename Func1 >
static bool	disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
Properties inherited from QObject
QString	objectName
	the name of this object
Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtBluetooth

The QBluetoothSocket class enables connection to a Bluetooth device running a bluetooth server.

Since

5.2

QBluetoothSocket supports two socket types, \l {QBluetoothServiceInfo::L2capProtocol}{L2CAP} and \l {QBluetoothServiceInfo::RfcommProtocol}{RFCOMM}.

\l {QBluetoothServiceInfo::L2capProtocol}{L2CAP} is a low level datagram-oriented Bluetooth socket. Android does not support \l {QBluetoothServiceInfo::L2capProtocol}{L2CAP} for socket connections.

\l {QBluetoothServiceInfo::RfcommProtocol}{RFCOMM} is a reliable, stream-oriented socket. RFCOMM sockets emulate an RS-232 serial port.

To create a connection to a Bluetooth service, create a socket of the appropriate type and call connectToService() passing the Bluetooth address and port number. QBluetoothSocket will emit the connected() signal when the connection is established.

If the \l {QBluetoothServiceInfo::Protocol}{Protocol} is not supported on a platform, calling \l connectToService() will emit a \l {QBluetoothSocket::SocketError::UnsupportedProtocolError}{UnsupportedProtocolError} error.

Note

QBluetoothSocket does not support synchronous read and write operations. Functions such as \l waitForReadyRead() and \l waitForBytesWritten() are not implemented. I/O operations should be performed using \l readyRead(), \l read() and \l write().

On iOS, this class cannot be used because the platform does not expose an API which may permit access to QBluetoothSocket related features.

Note

On macOS Monterey (12) the socket data flow is paused when a modal dialogue is executing, or an event tracking mode is entered (for example by long-pressing a Window close button). This may change in the future releases of macOS.

Definition at line 21 of file qbluetoothsocket.h.

Member Enumeration Documentation

SocketError

enum class QBluetoothSocket::SocketError

strong

This enum describes Bluetooth socket error types.

\value UnknownSocketError An unknown error has occurred. \value NoSocketError No error. Used for testing. \value HostNotFoundError Could not find the remote host. \value ServiceNotFoundError Could not find the service UUID on remote host. \value NetworkError Attempt to read or write from socket returned an error \value UnsupportedProtocolError The \l {QBluetoothServiceInfo::Protocol}{Protocol} is not supported on this platform. \value OperationError An operation was attempted while the socket was in a state that did not permit it. \value [since 5.10] RemoteHostClosedError The remote host closed the connection. \value [since 6.4] MissingPermissionsError The operating system requests permissions which were not granted by the user.

Enumerator
NoSocketError
UnknownSocketError
RemoteHostClosedError
HostNotFoundError
ServiceNotFoundError
NetworkError
UnsupportedProtocolError
OperationError
MissingPermissionsError

Definition at line 50 of file qbluetoothsocket.h.

SocketState

enum class QBluetoothSocket::SocketState

strong

This enum describes the state of the Bluetooth socket.

\value UnconnectedState Socket is not connected. \value ServiceLookupState Socket is querying connection parameters. \value ConnectingState Socket is attempting to connect to a device. \value ConnectedState Socket is connected to a device. \value BoundState Socket is bound to a local address and port. \value ClosingState Socket is connected and will be closed once all pending data is written to the socket. \value ListeningState Socket is listening for incoming connections.

Enumerator
UnconnectedState
ServiceLookupState
ConnectingState
ConnectedState
BoundState
ClosingState
ListeningState

Definition at line 39 of file qbluetoothsocket.h.

Constructor & Destructor Documentation

QBluetoothSocket() [1/2]

QBluetoothSocket::QBluetoothSocket ( QBluetoothServiceInfo::Protocol  socketType, QObject *  parent = nullptr  )

explicit

Constructs a Bluetooth socket of socketType type, with parent.

Definition at line 254 of file qbluetoothsocket.cpp.

References createSocketPrivate(), d, d_ptr, QIODeviceBase::NotOpen, QBluetoothSocketBasePrivate::q_ptr, QIODevice::setOpenMode(), and socketType().

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QBluetoothSocket() [2/2]

QBluetoothSocket::QBluetoothSocket ( QObject *  parent = nullptr )

explicit

Constructs a Bluetooth socket with parent.

Definition at line 269 of file qbluetoothsocket.cpp.

References createSocketPrivate(), d_ptr, QIODeviceBase::NotOpen, QBluetoothSocketBasePrivate::q_ptr, and QIODevice::setOpenMode().

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~QBluetoothSocket()

QBluetoothSocket::~QBluetoothSocket ( )

virtual

Destroys the Bluetooth socket.

Definition at line 301 of file qbluetoothsocket.cpp.

References d_ptr.

Member Function Documentation

abort()

void QBluetoothSocket::abort

(

)

Aborts the current connection and resets the socket.

Unlike disconnectFromService(), this function immediately closes the socket, discarding any pending data in the write buffer.

Note

On Android, aborting the socket requires asynchronous interaction with Android threads. Therefore the associated \l disconnected() and \l stateChanged() signals are delayed until the threads have finished the closure.

See also

disconnectFromService(), close()

Definition at line 657 of file qbluetoothsocket.cpp.

References ClosingState, d, QIODeviceBase::NotOpen, ServiceLookupState, QIODevice::setOpenMode(), setSocketState(), state(), and UnconnectedState.

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bytesAvailable()

qint64 QBluetoothSocket::bytesAvailable ( ) const

overridevirtual

Returns the number of incoming bytes that are waiting to be read.

See also

bytesToWrite(), read()

Reimplemented from QIODevice.

Definition at line 320 of file qbluetoothsocket.cpp.

References QIODevice::bytesAvailable(), and d.

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bytesToWrite()

qint64 QBluetoothSocket::bytesToWrite ( ) const

overridevirtual

Returns the number of bytes that are waiting to be written.

The bytes are written when control goes back to the event loop.

Reimplemented from QIODevice.

Definition at line 330 of file qbluetoothsocket.cpp.

References d.

canReadLine()

bool QBluetoothSocket::canReadLine ( ) const

overridevirtual

Returns true if you can read at least one line from the device.

Reimplemented from QIODevice.

Definition at line 562 of file qbluetoothsocket.cpp.

References QIODevice::canReadLine(), and d.

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close()

void QBluetoothSocket::close ( )

overridevirtual

Disconnects the socket's connection with the device.

Note

On Android, closing the socket requires asynchronous interaction with Android threads. Therefore the associated \l disconnected() and \l stateChanged() signals are delayed until the threads have finished the closure.

Reimplemented from QIODevice.

Definition at line 735 of file qbluetoothsocket.cpp.

References ClosingState, d, QIODeviceBase::NotOpen, ServiceLookupState, QIODevice::setOpenMode(), setSocketState(), state(), and UnconnectedState.

Referenced by QLowEnergyControllerPrivateBluez::disconnectFromDevice(), and disconnectFromService().

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connected

void QBluetoothSocket::connected ( )

signal

This signal is emitted when a connection is established.

See also

QBluetoothSocket::SocketState::ConnectedState, stateChanged()

Referenced by setSocketState().

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connectToService() [1/4]

void QBluetoothSocket::connectToService	(	const QBluetoothAddress &	address,
		const QBluetoothUuid &	uuid,
		OpenMode	openMode = ReadWrite
	)

Attempts to make a connection to the service identified by uuid on the device with address address.

The socket is opened in the given openMode.

For BlueZ, the socket first enters the \l ServiceLookupState and queries the connection parameters for uuid. If the service parameters are successfully retrieved the socket enters ConnectingState, and attempts to connect to address. If a connection is established, QBluetoothSocket enters \l ConnectedState and emits connected().

On Android, the service connection can directly be established using the UUID of the remote service. Therefore the platform does not require the \l ServiceLookupState and \l socketType() is always set to \l QBluetoothServiceInfo::RfcommProtocol.

At any point, the socket can emit errorOccurred() to signal that an error occurred.

Note that most platforms require a pairing prior to connecting to the remote device. Otherwise the connection process may fail.

See also

state(), disconnectFromService()

Definition at line 393 of file qbluetoothsocket.cpp.

References d, and QIODevice::openMode().

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connectToService() [2/4]

void QBluetoothSocket::connectToService ( const QBluetoothAddress &  address, QBluetoothUuid::ServiceClassUuid  uuid, OpenMode  mode = ReadWrite  )

inline

Exists to avoid QTBUG-65831.

Definition at line 81 of file qbluetoothsocket.h.

connectToService() [3/4]

void QBluetoothSocket::connectToService	(	const QBluetoothAddress &	address,
		quint16	port,
		OpenMode	openMode = ReadWrite
	)

Attempts to make a connection with address on the given port.

The socket is opened in the given openMode.

The socket first enters ConnectingState, and attempts to connect to address. If a connection is established, QBluetoothSocket enters ConnectedState and emits connected().

At any point, the socket can emit errorOccurred() to signal that an error occurred.

On Android and BlueZ (version 5.46 or above), a connection to a service can not be established using a port. Calling this function will emit a \l {QBluetoothSocket::SocketError::ServiceNotFoundError}{ServiceNotFoundError}.

Note that most platforms require a pairing prior to connecting to the remote device. Otherwise the connection process may fail.

See also

state(), disconnectFromService()

Definition at line 417 of file qbluetoothsocket.cpp.

References d, and QIODevice::openMode().

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connectToService() [4/4]

void QBluetoothSocket::connectToService	(	const QBluetoothServiceInfo &	service,
		OpenMode	openMode = ReadWrite
	)

Attempts to connect to the service described by service.

The socket is opened in the given openMode. The \l socketType() is ignored if service specifies a differing \l QBluetoothServiceInfo::socketProtocol().

The socket first enters ConnectingState and attempts to connect to the device providing service. If a connection is established, QBluetoothSocket enters ConnectedState and emits connected().

At any point, the socket can emit errorOccurred() to signal that an error occurred.

Note that most platforms require a pairing prior to connecting to the remote device. Otherwise the connection process may fail.

On Android, only RFCOMM connections are possible. This function ignores any socket protocol indicator and assumes RFCOMM.

See also

state(), disconnectFromService()

Definition at line 356 of file qbluetoothsocket.cpp.

References d, and QIODevice::openMode().

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disconnected

void QBluetoothSocket::disconnected ( )

signal

This signal is emitted when the socket is disconnected.

See also

QBluetoothSocket::SocketState::UnconnectedState, stateChanged()

Referenced by setSocketState().

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disconnectFromService()

void QBluetoothSocket::disconnectFromService

(

)

Attempts to close the socket.

If there is pending data waiting to be written QBluetoothSocket will enter ClosingState and wait until all data has been written. Eventually, it will enter UnconnectedState and emit the disconnected() signal.

See also

connectToService()

Definition at line 675 of file qbluetoothsocket.cpp.

References close().

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doDeviceDiscovery()

void QBluetoothSocket::doDeviceDiscovery ( const QBluetoothServiceInfo &  service, OpenMode  openMode  )

protected

Start device discovery for service and open the socket with openMode.

If the socket is created with a service uuid device address, use service discovery to find the port number to connect to.

Definition at line 584 of file qbluetoothsocket.cpp.

References QList< T >::append(), QObject::connect(), d, QBluetoothServiceDiscoveryAgent::finished(), QBluetoothServiceDiscoveryAgent::FullDiscovery, QList< T >::isEmpty(), QIODevice::openMode(), Q_ASSERT, qCDebug, QBluetoothServiceDiscoveryAgent::serviceDiscovered(), ServiceLookupState, and setSocketState().

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error()

QBluetoothSocket::SocketError QBluetoothSocket::error

(

)

const

Returns the last error.

Definition at line 448 of file qbluetoothsocket.cpp.

References d.

errorOccurred

void QBluetoothSocket::errorOccurred ( QBluetoothSocket::SocketError  error )

signal

This signal is emitted when an error occurs.

See also

error()

Since

6.2

Referenced by setSocketError().

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errorString()

QString QBluetoothSocket::errorString

(

)

const

Returns a user displayable text string for the error.

Definition at line 457 of file qbluetoothsocket.cpp.

References d.

isSequential()

bool QBluetoothSocket::isSequential ( ) const

overridevirtual

\reimp

Reimplemented from QIODevice.

Definition at line 310 of file qbluetoothsocket.cpp.

localAddress()

QBluetoothAddress QBluetoothSocket::localAddress

(

)

const

Returns the address of the local device.

Although some platforms may differ the socket must generally be connected to guarantee the return of a valid address. In particular, this is true when dealing with platforms that support multiple local Bluetooth adapters.

Definition at line 686 of file qbluetoothsocket.cpp.

References d.

localName()

QString QBluetoothSocket::localName

(

)

const

Returns the name of the local device.

Although some platforms may differ the socket must generally be connected to guarantee the return of a valid name. In particular, this is true when dealing with platforms that support multiple local Bluetooth adapters.

Definition at line 680 of file qbluetoothsocket.cpp.

References d.

localPort()

quint16 QBluetoothSocket::localPort

(

)

const

Returns the port number of the local socket if available, otherwise returns 0.

Although some platforms may differ the socket must generally be connected to guarantee the return of a valid port number.

On Android and \macos, this feature is not supported and returns 0.

Definition at line 692 of file qbluetoothsocket.cpp.

References d.

peerAddress()

QBluetoothAddress QBluetoothSocket::peerAddress

(

)

const

Returns the address of the peer device.

Definition at line 704 of file qbluetoothsocket.cpp.

References d.

peerName()

QString QBluetoothSocket::peerName

(

)

const

Returns the name of the peer device.

Definition at line 698 of file qbluetoothsocket.cpp.

References d.

peerPort()

quint16 QBluetoothSocket::peerPort

(

)

const

Return the port number of the peer socket if available, otherwise returns 0.

On Android, this feature is not supported.

Definition at line 710 of file qbluetoothsocket.cpp.

References d.

preferredSecurityFlags()

QBluetooth::SecurityFlags QBluetoothSocket::preferredSecurityFlags

(

)

const

Returns the security parameters used for the initial connection attempt.

The security parameters may be renegotiated between the two parties during or after the connection has been established. If such a change happens it is not reflected in the value of this flag.

On \macos, this flag is always set to \l QBluetooth::Security::Secure.

See also

setPreferredSecurityFlags()

Since

5.6

Definition at line 515 of file qbluetoothsocket.cpp.

References d, and QBluetooth::Secure.

readData()

qint64 QBluetoothSocket::readData ( char *  data, qint64  maxSize  )

overrideprotectedvirtual

\reimp

Implements QIODevice.

Definition at line 729 of file qbluetoothsocket.cpp.

References d.

setPreferredSecurityFlags()

void QBluetoothSocket::setPreferredSecurityFlags

(

QBluetooth::SecurityFlags

flags

)

Sets the preferred security parameter for the connection attempt to flags.

This value is incorporated when calling \l connectToService(). Therefore it is required to reconnect to change this parameter for an existing connection.

On Bluez this property is set to QBluetooth::Security::Authorization by default.

On \macos, this value is ignored as the platform does not permit access to the security parameter of the socket. By default the platform prefers secure/encrypted connections though and therefore this function always returns \l QBluetooth::Security::Secure.

Android only supports two levels of security (secure and non-secure). If this flag is set to \l QBluetooth::Security::NoSecurity the socket object will not employ any authentication or encryption. Any other security flag combination will trigger a secure Bluetooth connection. This flag is set to \l QBluetooth::Security::Secure by default.

Note

A secure connection requires a pairing between the two devices. On some platforms, the pairing is automatically initiated during the establishment of the connection. Other platforms require the application to manually trigger the pairing before attempting to connect.

See also

preferredSecurityFlags()

Since

5.6

Definition at line 491 of file qbluetoothsocket.cpp.

References d.

setSocketDescriptor()

bool QBluetoothSocket::setSocketDescriptor	(	int	socketDescriptor,
		QBluetoothServiceInfo::Protocol	socketType,
		SocketState	socketState = SocketState::ConnectedState,
		OpenMode	openMode = ReadWrite
	)

Sets the socket to use socketDescriptor with a type of socketType, which is in state socketState, and mode openMode.

The socket descriptor is owned by the QBluetoothSocket instance and may be closed once finished.

Returns true on success.

Definition at line 769 of file qbluetoothsocket.cpp.

References d, QIODevice::openMode(), socketDescriptor(), and socketType().

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setSocketError()

void QBluetoothSocket::setSocketError ( QBluetoothSocket::SocketError  error_ )

protected

Sets the type of error that last occurred to error_.

Definition at line 571 of file qbluetoothsocket.cpp.

References d, emit, and errorOccurred().

Referenced by writeData().

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setSocketState()

void QBluetoothSocket::setSocketState ( QBluetoothSocket::SocketState  state )

protected

Sets the socket state to state.

Definition at line 529 of file qbluetoothsocket.cpp.

References ClosingState, connected(), ConnectedState, d, disconnected(), emit, ListeningState, qCWarning, state(), stateChanged(), and UnconnectedState.

Referenced by abort(), close(), and doDeviceDiscovery().

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socketDescriptor()

int QBluetoothSocket::socketDescriptor

(

)

const

Returns the platform-specific socket descriptor, if available.

This function returns -1 if the descriptor is not available or an error has occurred.

Definition at line 781 of file qbluetoothsocket.cpp.

References d.

Referenced by setSocketDescriptor().

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socketType()

QBluetoothServiceInfo::Protocol QBluetoothSocket::socketType

(

)

const

Returns the socket type.

The socket automatically adjusts to the protocol offered by the remote service.

Android only support \l{QBluetoothServiceInfo::RfcommProtocol}{RFCOMM} based sockets.

Definition at line 430 of file qbluetoothsocket.cpp.

References d.

Referenced by QBluetoothSocket(), and setSocketDescriptor().

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state()

QBluetoothSocket::SocketState QBluetoothSocket::state

(

)

const

Returns the current state of the socket.

Definition at line 439 of file qbluetoothsocket.cpp.

References d.

Referenced by abort(), close(), and setSocketState().

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stateChanged

QBluetoothSocket::stateChanged ( QBluetoothSocket::SocketState  state )

signal

This signal is emitted when the socket state changes to state.

See also

connected(), disconnected(), state(), QBluetoothSocket::SocketState

Referenced by setSocketState().

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writeData()

qint64 QBluetoothSocket::writeData ( const char *  data, qint64  maxSize  )

overrideprotectedvirtual

\reimp

Implements QIODevice.

Definition at line 716 of file qbluetoothsocket.cpp.

References d, d_ptr, QBluetoothSocketBasePrivate::errorString, OperationError, setSocketError(), and tr.

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Friends And Related Symbol Documentation

QBluetoothServer

friend class QBluetoothServer

friend

Definition at line 27 of file qbluetoothsocket.h.

QBluetoothServerPrivate

friend class QBluetoothServerPrivate

friend

Definition at line 28 of file qbluetoothsocket.h.

QBluetoothSocketPrivateAndroid

friend class QBluetoothSocketPrivateAndroid

friend

Definition at line 30 of file qbluetoothsocket.h.

QBluetoothSocketPrivateBluez

friend class QBluetoothSocketPrivateBluez

friend

Definition at line 31 of file qbluetoothsocket.h.

QBluetoothSocketPrivateBluezDBus

friend class QBluetoothSocketPrivateBluezDBus

friend

Definition at line 32 of file qbluetoothsocket.h.

QBluetoothSocketPrivateDarwin

friend class QBluetoothSocketPrivateDarwin

friend

Definition at line 29 of file qbluetoothsocket.h.

QBluetoothSocketPrivateDummy

friend class QBluetoothSocketPrivateDummy

friend

Definition at line 33 of file qbluetoothsocket.h.

QBluetoothSocketPrivateWin

friend class QBluetoothSocketPrivateWin

friend

Definition at line 34 of file qbluetoothsocket.h.

QBluetoothSocketPrivateWinRT

friend class QBluetoothSocketPrivateWinRT

friend

Definition at line 35 of file qbluetoothsocket.h.

QLowEnergyControllerPrivateBluez

friend class QLowEnergyControllerPrivateBluez

friend

Definition at line 151 of file qbluetoothsocket.h.

Member Data Documentation

d_ptr

QBluetoothSocketBasePrivate* QBluetoothSocket::d_ptr

protected

Definition at line 148 of file qbluetoothsocket.h.

Referenced by QBluetoothSocket(), QBluetoothSocket(), ~QBluetoothSocket(), QBluetoothServer::nextPendingConnection(), and writeData().

---

The documentation for this class was generated from the following files:

• qtconnectivity/src/bluetooth/qbluetoothsocket.h
• qtconnectivity/src/bluetooth/qbluetoothsocket.cpp