QBluetoothLocalDevice Class
The QBluetoothLocalDevice class enables access to the local Bluetooth device. More...
| Header: | #include <QBluetoothLocalDevice> |
| qmake: | QT += bluetooth |
| Since: | Qt 5.2 |
| Inherits: | QObject |
Public Types
| enum | Error { NoError, PairingError, UnknownError } |
| enum | HostMode { HostPoweredOff, HostConnectable, HostDiscoverable, HostDiscoverableLimitedInquiry } |
| enum | Pairing { Unpaired, Paired, AuthorizedPaired } |
Public Functions
| QBluetoothLocalDevice(const QBluetoothAddress &address, QObject *parent = 0) | |
| QBluetoothLocalDevice(QObject *parent = nullptr) | |
| virtual | ~QBluetoothLocalDevice() |
| QBluetoothAddress | address() const |
| QList<QBluetoothAddress> | connectedDevices() const |
| QBluetoothLocalDevice::HostMode | hostMode() const |
| bool | isValid() const |
| QString | name() const |
| QBluetoothLocalDevice::Pairing | pairingStatus(const QBluetoothAddress &address) const |
| void | powerOn() |
| void | requestPairing(const QBluetoothAddress &address, QBluetoothLocalDevice::Pairing pairing) |
| void | setHostMode(QBluetoothLocalDevice::HostMode mode) |
Signals
| void | deviceConnected(const QBluetoothAddress &address) |
| void | deviceDisconnected(const QBluetoothAddress &address) |
| void | errorOccurred(QBluetoothLocalDevice::Error error) |
| void | hostModeStateChanged(QBluetoothLocalDevice::HostMode state) |
| void | pairingFinished(const QBluetoothAddress &address, QBluetoothLocalDevice::Pairing pairing) |
Static Public Members
| QList<QBluetoothHostInfo> | allDevices() |
Detailed Description
QBluetoothLocalDevice provides functions for getting and setting the state of local Bluetooth devices.
On iOS and Windows, this class cannot be used because the platform does not expose any data or API which may provide information on the local Bluetooth device.
Member Type Documentation
enum QBluetoothLocalDevice::Error
This enum describes errors that maybe returned
| Constant | Value | Description |
|---|---|---|
QBluetoothLocalDevice::NoError | 0 | No known error |
QBluetoothLocalDevice::PairingError | 1 | Error in pairing |
QBluetoothLocalDevice::UnknownError | 100 | Unknown error |
enum QBluetoothLocalDevice::HostMode
This enum describes the most of the local Bluetooth device.
| Constant | Value | Description |
|---|---|---|
QBluetoothLocalDevice::HostPoweredOff | 0 | Power off the device |
QBluetoothLocalDevice::HostConnectable | 1 | Remote Bluetooth devices can connect to the local Bluetooth device if they have previously been paired with it or otherwise know its address. This powers up the device if it was powered off. |
QBluetoothLocalDevice::HostDiscoverable | 2 | Remote Bluetooth devices can discover the presence of the local Bluetooth device. The device will also be connectable, and powered on. On Android, this mode can only be active for a maximum of 5 minutes. |
QBluetoothLocalDevice::HostDiscoverableLimitedInquiry | 3 | Remote Bluetooth devices can discover the presence of the local Bluetooth device when performing a limited inquiry. This should be used for locating services that are only made discoverable for a limited period of time. This can speed up discovery between gaming devices, as service discovery can be skipped on devices not in LimitedInquiry mode. In this mode, the device will be connectable and powered on, if required. This mode is is not supported on Android. On macOS, it is not possible to set the hostMode() to HostConnectable or HostPoweredOff. |
enum QBluetoothLocalDevice::Pairing
This enum describes the pairing state between the two Bluetooth devices.
| Constant | Value | Description |
|---|---|---|
QBluetoothLocalDevice::Unpaired | 0 | The Bluetooth devices are not paired. |
QBluetoothLocalDevice::Paired | 1 | The Bluetooth devices are paired. The system will prompt the user for authorization when the remote device initiates a connection to the local device. |
QBluetoothLocalDevice::AuthorizedPaired | 2 | The Bluetooth devices are paired. The system will not prompt the user for authorization when the remote device initiates a connection to the local device. |
Member Function Documentation
QBluetoothLocalDevice::QBluetoothLocalDevice(const QBluetoothAddress &address, QObject *parent = 0)
Construct new QBluetoothLocalDevice for address. If address is default constructed the resulting local device selects the local default device.
QBluetoothLocalDevice::QBluetoothLocalDevice(QObject *parent = nullptr)
Constructs a QBluetoothLocalDevice with parent.
[signal, since 5.3] void QBluetoothLocalDevice::deviceConnected(const QBluetoothAddress &address)
This signal is emitted when the local device establishes a connection to a remote device with address.
This function was introduced in Qt 5.3.
See also deviceDisconnected() and connectedDevices().
[signal, since 5.3] void QBluetoothLocalDevice::deviceDisconnected(const QBluetoothAddress &address)
This signal is emitted when the local device disconnects from a remote Bluetooth device with address.
This function was introduced in Qt 5.3.
See also deviceConnected() and connectedDevices().
[signal, since 6.2] void QBluetoothLocalDevice::errorOccurred(QBluetoothLocalDevice::Error error)
Signal emitted if there's an exceptional error while pairing.
This function was introduced in Qt 6.2.
[signal] void QBluetoothLocalDevice::hostModeStateChanged(QBluetoothLocalDevice::HostMode state)
The state of the host has transitioned to a different HostMode.
[signal] void QBluetoothLocalDevice::pairingFinished(const QBluetoothAddress &address, QBluetoothLocalDevice::Pairing pairing)
Pairing or unpairing has completed with address. Current pairing status is in pairing. If the pairing request was not successful, this signal will not be emitted. The errorOccurred() signal is emitted if the pairing request failed. The signal is only ever emitted for pairing requests which have previously requested by calling requestPairing() of the current object instance.
[virtual] QBluetoothLocalDevice::~QBluetoothLocalDevice()
Destroys the QBluetoothLocalDevice.
QBluetoothAddress QBluetoothLocalDevice::address() const
Returns the MAC address of this Bluetooth device.
Note: On Android, this function always returns the constant value 02:00:00:00:00:00 as local address starting with Android 6.0. The programmatic access to the device's local MAC address was removed.
[static] QList<QBluetoothHostInfo> QBluetoothLocalDevice::allDevices()
Returns a list of all available local Bluetooth devices. On macOS, there is only the "default" local device.
[since 5.3] QList<QBluetoothAddress> QBluetoothLocalDevice::connectedDevices() const
Returns the list of connected devices. This list is different from the list of currently paired devices.
On Android and macOS, it is not possible to retrieve a list of connected devices. It is only possible to listen to (dis)connect changes. For convenience, this class monitors all connect and disconnect events since its instanciation and returns the current list when calling this function. Therefore it is possible that this function returns an empty list shortly after creating an instance.
This function was introduced in Qt 5.3.
See also deviceConnected() and deviceDisconnected().
QBluetoothLocalDevice::HostMode QBluetoothLocalDevice::hostMode() const
Returns the current host mode of this local Bluetooth device. On macOS, it is either HostPoweredOff or HostConnectable.
See also setHostMode().
bool QBluetoothLocalDevice::isValid() const
Returns true if the QBluetoothLocalDevice represents an available local Bluetooth device; otherwise return false.
If the local Bluetooth adapter represented by an instance of this class is removed from the system (e.g. removal of the underlying Bluetooth dongle) then this instance will become invalid. An already invalid QBluetoothLocalDevice instance remains invalid even if the same Bluetooth adapter is returned to the system.
See also allDevices().
QString QBluetoothLocalDevice::name() const
Returns the name assgined by the user to this Bluetooth device.
QBluetoothLocalDevice::Pairing QBluetoothLocalDevice::pairingStatus(const QBluetoothAddress &address) const
Returns the current bluetooth pairing status of address, if it's unpaired, paired, or paired and authorized.
void QBluetoothLocalDevice::powerOn()
Powers on the device after returning it to the hostMode() state, if it was powered off.
Note: Due to varying security policies on the supported platforms, this method may have differing behaviors on the various platforms. For example the system may ask the user for confirmation before turning Bluetooth on or off. On macOS it is not possible to power on/off Bluetooth. Please refer to the platform specific Bluetooth documentation for details.
void QBluetoothLocalDevice::requestPairing(const QBluetoothAddress &address, QBluetoothLocalDevice::Pairing pairing)
Set the pairing status with address. The results are returned by the signal, pairingFinished(). On Android and macOS, AuthorizedPaired is not possible and will have the same behavior as Paired.
On macOS, it is not possible to unpair a device. If Unpaired is requested, pairingFinished() is immediately emitted although the device remains paired. It is possible to request the pairing for a previously unpaired device. In addition AuthorizedPaired has the same behavior as Paired.
Caution: creating a pairing may take minutes, and may require the user to acknowledge.
void QBluetoothLocalDevice::setHostMode(QBluetoothLocalDevice::HostMode mode)
Sets the host mode of this local Bluetooth device to mode.
Some transitions such as turning the device on or off may take some time. Therefore subsequent calls should only be made once the hostModeStateChanged() signal has concluded the previous request. If this is ignored the result of such a series of calls is not well defined.
Note: Due to varying security policies on the supported platforms, this method may have differing behaviors on the various platforms. For example the system may ask the user for confirmation before turning Bluetooth on or off and not all host modes may be supported. On macOS, it is not possbile to programmatically change the hostMode(). A user can only switch Bluetooth on/off in the System Preferences. Please refer to the platform specific Bluetooth documentation for details.
See also hostMode().