The QBluetoothSocket class enables connection to a Bluetooth device running a bluetooth server. 更多...
| 头： | #include <QBluetoothSocket> |
| qmake: | QT += bluetooth |
| Since: | Qt 5.2 |
| 继承： | QIODevice |
该类在 Qt 5.2 引入。
| enum | SocketError { UnknownSocketError, NoSocketError, HostNotFoundError, ServiceNotFoundError, NetworkError, …, RemoteHostClosedError } |
| enum | SocketState { UnconnectedState, ServiceLookupState, ConnectingState, ConnectedState, BoundState, …, ListeningState } |
| QBluetoothSocket (QObject * parent = nullptr) | |
| QBluetoothSocket (QBluetoothServiceInfo::Protocol socketType , QObject * parent = nullptr) | |
| virtual | ~QBluetoothSocket () |
| void | abort () |
| void | connectToService (const QBluetoothServiceInfo & service , QIODevice::OpenMode openMode = ReadWrite) |
| void | connectToService (const QBluetoothAddress & address , const QBluetoothUuid & uuid , QIODevice::OpenMode openMode = ReadWrite) |
| void | connectToService (const QBluetoothAddress & address , quint16 port , QIODevice::OpenMode openMode = ReadWrite) |
| void | disconnectFromService () |
| QBluetoothSocket::SocketError | error () const |
| QString | errorString () const |
| QBluetoothAddress | localAddress () const |
| QString | localName () const |
| quint16 | localPort () const |
| QBluetoothAddress | peerAddress () const |
| QString | peerName () const |
| quint16 | peerPort () const |
| QBluetooth::SecurityFlags | preferredSecurityFlags () const |
| void | setPreferredSecurityFlags (QBluetooth::SecurityFlags flags ) |
| bool | setSocketDescriptor (int socketDescriptor , QBluetoothServiceInfo::Protocol socketType , QBluetoothSocket::SocketState socketState = ConnectedState, QIODevice::OpenMode openMode = ReadWrite) |
| int | socketDescriptor () const |
| QBluetoothServiceInfo::Protocol | socketType () const |
| QBluetoothSocket::SocketState | state () const |
| virtual qint64 | bytesAvailable () const override |
| virtual qint64 | bytesToWrite () const override |
| virtual bool | canReadLine () const override |
| virtual void | close () override |
| virtual bool | isSequential () const override |
| void | connected () |
| void | disconnected () |
| void | error (QBluetoothSocket::SocketError error ) |
| void | stateChanged (QBluetoothSocket::SocketState state ) |
| void | doDeviceDiscovery (const QBluetoothServiceInfo & service , QIODevice::OpenMode openMode ) |
| void | setSocketError (QBluetoothSocket::SocketError error_ ) |
| void | setSocketState (QBluetoothSocket::SocketState state ) |
| virtual qint64 | readData (char * data , qint64 maxSize ) override |
| virtual qint64 | writeData (const char * data , qint64 maxSize ) override |
QBluetoothSocket supports two socket types, L2CAP and RFCOMM .
L2CAP is a low level datagram-oriented Bluetooth socket. Android does not support L2CAP for socket connections.
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.
若 Protocol 在平台中不被支持，调用 connectToService () 将发射 UnsupportedProtocolError 错误。
注意： QBluetoothSocket does not support synchronous read and write operations. Functions such as waitForReadyRead () 和 waitForBytesWritten () are not implemented. I/O operations should be performed using readyRead (), read () 和 write ().
On iOS, this class cannot be used because the platform does not expose an API which may permit access to QBluetoothSocket related features.
注意： 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.
此枚举描述 Bluetooth 套接字错误类型。
| 常量 | 值 | 描述 |
|---|---|---|
QBluetoothSocket::UnknownSocketError
|
QAbstractSocket::UnknownSocketError
|
出现未知错误。 |
QBluetoothSocket::NoSocketError
|
-2
|
没有错误。用于测试。 |
QBluetoothSocket::HostNotFoundError
|
QAbstractSocket::HostNotFoundError
|
Could not find the remote host. |
QBluetoothSocket::ServiceNotFoundError
|
QAbstractSocket::SocketAddressNotAvailableError
|
Could not find the service UUID on remote host. |
QBluetoothSocket::NetworkError
|
QAbstractSocket::NetworkError
|
Attempt to read or write from socket returned an error |
QBluetoothSocket::UnsupportedProtocolError
|
8
|
The Protocol is not supported on this platform. |
QBluetoothSocket::OperationError
|
QAbstractSocket::OperationError
|
试图操作当套接字处于不准许状态时。 |
QBluetoothSocket::RemoteHostClosedError
|
QAbstractSocket::RemoteHostClosedError
|
The remote host closed the connection. This value was introduced by Qt 5.10. |
This enum describes the state of the Bluetooth socket.
| 常量 | 值 | 描述 |
|---|---|---|
QBluetoothSocket::UnconnectedState
|
QAbstractSocket::UnconnectedState
|
Socket is not connected. |
QBluetoothSocket::ServiceLookupState
|
QAbstractSocket::HostLookupState
|
Socket is querying connection parameters. |
QBluetoothSocket::ConnectingState
|
QAbstractSocket::ConnectingState
|
Socket is attempting to connect to a device. |
QBluetoothSocket::ConnectedState
|
QAbstractSocket::ConnectedState
|
Socket is connected to a device. |
QBluetoothSocket::BoundState
|
QAbstractSocket::BoundState
|
Socket is bound to a local address and port. |
QBluetoothSocket::ClosingState
|
QAbstractSocket::ClosingState
|
Socket is connected and will be closed once all pending data is written to the socket. |
QBluetoothSocket::ListeningState
|
QAbstractSocket::ListeningState
|
Socket is listening for incoming connections. |
Constructs a Bluetooth socket with parent .
Constructs a Bluetooth socket of socketType type, with parent .
[signal]
void
QBluetoothSocket::
connected
()
This signal is emitted when a connection is established.
另请参阅 QBluetoothSocket::ConnectedState and stateChanged ().
[signal]
void
QBluetoothSocket::
disconnected
()
This signal is emitted when the socket is disconnected.
另请参阅 QBluetoothSocket::UnconnectedState and stateChanged ().
[signal]
void
QBluetoothSocket::
error
(
QBluetoothSocket::SocketError
error
)
此信号发射当 error 出现。
注意： 信号 error 在此类中被重载。通过使用函数指针句法连接到此信号，Qt 提供用于获得如此范例展示的函数指针的方便帮助程序：
connect(bluetoothSocket, QOverload<QBluetoothSocket::SocketError>::of(&QBluetoothSocket::error), [=](QBluetoothSocket::SocketError error){ /* ... */ });
另请参阅 error ().
[signal]
void
QBluetoothSocket::
stateChanged
(
QBluetoothSocket::SocketState
state
)
This signal is emitted when the socket state changes to state .
另请参阅 connected (), disconnected (), state ()，和 QBluetoothSocket::SocketState .
[虚拟]
QBluetoothSocket::
~QBluetoothSocket
()
Destroys the Bluetooth socket.
中止当前连接并重置套接字。不像 disconnectFromService ()，此函数立即关闭套接字，丢弃写缓冲中任何待决数据。
注意： On Android, aborting the socket requires asynchronous interaction with Android threads. Therefore the associated disconnected () 和 stateChanged () signals are delayed until the threads have finished the closure.
另请参阅 disconnectFromService () 和 close ().
[override virtual]
qint64
QBluetoothSocket::
bytesAvailable
() const
重实现： QIODevice::bytesAvailable () const.
返回等待读取的传入字节数。
另请参阅 bytesToWrite () 和 read ().
[override virtual]
qint64
QBluetoothSocket::
bytesToWrite
() const
重实现： QIODevice::bytesToWrite () const.
Returns the number of bytes that are waiting to be written. The bytes are written when control goes back to the event loop.
[override virtual]
bool
QBluetoothSocket::
canReadLine
() const
重实现： QIODevice::canReadLine () const.
Returns true if you can read at least one line from the device
[override virtual]
void
QBluetoothSocket::
close
()
重实现： QIODevice::close ().
Disconnects the socket's connection with the device.
注意： On Android, closing the socket requires asynchronous interaction with Android threads. Therefore the associated disconnected () 和 stateChanged () signals are delayed until the threads have finished the closure.
Attempts to connect to the service described by service .
套接字被打开采用给定 openMode 。 socketType () is ignored if service specifies a differing QBluetoothServiceInfo::socketProtocol ().
The socket first enters ConnectingState and attempts to connect to the device providing service 。若建立连接， QBluetoothSocket 进入 ConnectedState 并发射 connected ().
在任何时候，套接字可以发射 error () 给 (发出错误的) 信号。
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.
另请参阅 state () 和 disconnectFromService ().
Attempts to make a connection to the service identified by uuid on the device with address address .
套接字被打开采用给定 openMode .
For BlueZ , the socket first enters the 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 。若建立连接， QBluetoothSocket 进入 ConnectedState 并发射 connected ().
On Android, the service connection can directly be established using the UUID of the remote service. Therefore the platform does not require the ServiceLookupState and socketType () is always set to QBluetoothServiceInfo::RfcommProtocol .
在任何时候，套接字可以发射 error () 给 (发出错误的) 信号。
Note that most platforms require a pairing prior to connecting to the remote device. Otherwise the connection process may fail.
另请参阅 state () 和 disconnectFromService ().
Attempts to make a connection with address 在给定 port .
套接字被打开采用给定 openMode .
The socket first enters ConnectingState , and attempts to connect to address 。若建立连接， QBluetoothSocket 进入 ConnectedState 并发射 connected ().
在任何时候，套接字可以发射 error () 给 (发出错误的) 信号。
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 ServiceNotFoundError .
Note that most platforms require a pairing prior to connecting to the remote device. Otherwise the connection process may fail.
另请参阅 state () 和 disconnectFromService ().
Attempts to close the socket. If there is pending data waiting to be written QBluetoothSocket 将进入 ClosingState 并等待直到所有数据被写入。最终，它将进入 UnconnectedState 和发射 disconnected () 信号。
另请参阅 connectToService ().
[protected]
void
QBluetoothSocket::
doDeviceDiscovery
(const
QBluetoothServiceInfo
&
service
,
QIODevice::OpenMode
openMode
)
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.
Returns the last error.
Returns a user displayable text string for the error.
[override virtual]
bool
QBluetoothSocket::
isSequential
() const
重实现： QIODevice::isSequential () 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.
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.
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.
Returns the address of the peer device.
Returns the name of the peer device.
Return the port number of the peer socket if available, otherwise returns 0. On Android, this feature is not supported.
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 QBluetooth::Secure .
该函数在 Qt 5.6 引入。
另请参阅 setPreferredSecurityFlags ().
[override virtual protected]
qint64
QBluetoothSocket::
readData
(
char
*
data
,
qint64
maxSize
)
重实现： QIODevice::readData (char *data, qint64 maxSize).
Sets the preferred security parameter for the connection attempt to flags . This value is incorporated when calling connectToService (). Therefore it is required to reconnect to change this parameter for an existing connection.
On Bluez this property is set to QBluetooth::Authorization 在默认情况下。
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 QBluetooth::Secure .
Android only supports two levels of security (secure and non-secure). If this flag is set to QBluetooth::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 QBluetooth::Secure 在默认情况下。
注意： 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.
该函数在 Qt 5.6 引入。
另请参阅 preferredSecurityFlags ().
Set the socket to use socketDescriptor with a type of socketType , which is in state, socketState , and mode, openMode .
The set socket descriptor is considered owned by the QBluetoothSocket and may be e.g. closed once finished.
返回 true 当成功时
另请参阅 socketDescriptor ().
[protected]
void
QBluetoothSocket::
setSocketError
(
QBluetoothSocket::SocketError
error_
)
将最后出现的错误类型设为 error_ .
[protected]
void
QBluetoothSocket::
setSocketState
(
QBluetoothSocket::SocketState
state
)
Sets the socket state to state .
Returns the platform-specific socket descriptor, if available. This function returns -1 if the descriptor is not available or an error has occurred.
另请参阅 setSocketDescriptor ().
Returns the socket type. The socket automatically adjusts to the protocol offered by the remote service.
Android only support RFCOMM based sockets.
返回套接字的当前状态。
[override virtual protected]
qint64
QBluetoothSocket::
writeData
(const
char
*
data
,
qint64
maxSize
)
重实现： QIODevice::writeData (const char *data, qint64 maxSize).