The QBluetoothServiceDiscoveryAgent class provides an API for querying the services provided by a Bluetooth device.
To query the services provided by all contactable Bluetooth devices create an instance of QBluetoothServiceDiscoveryAgent, connect to either the serviceDiscovered() or finished() signals and call start().
QBluetoothServiceDiscoveryAgent *discoveryAgent = new QBluetoothServiceDiscoveryAgent(this); connect(discoveryAgent, SIGNAL(serviceDiscovered(const QBluetoothServiceInfo&)), this, SLOT(serviceDiscovered(const QBluetoothServiceInfo&))); // Automatically delete agent when service discovery finishes. connect(discoveryAgent, SIGNAL(finished()), this, SLOT(deleteLater())); discoveryAgent->start();By default a minimal service discovery is performed. In this mode the QBluetotohServiceInfo objects returned are guaranteed to contain only device and service UUID information. Depending on platform and device capabilities other service information may also be available. For most use cases this is adequate as QBluetoothSocket::connectToService() will perform additional discovery if required. If full service information is required pass FullDiscovery as the discoveryMode parameter to start().
Public Types Index
Public Functions Index
|QBluetoothServiceDiscoveryAgent (QObject *parent=0)|
|QBluetoothServiceDiscoveryAgent (const QBluetoothAddress &remoteAddress, QObject *parent=0)|
|QList< QBluetoothServiceInfo >||discoveredServices () const|
|Error||error () const|
|QString||errorString () const|
|bool||isActive () const|
|void||setUuidFilter (const QList< QBluetoothUuid > &uuids)|
|void||setUuidFilter (const QBluetoothUuid &uuid)|
|QList< QBluetoothUuid >||uuidFilter () const|
This enum describes the service discovery mode.
MinimalDiscovery Performs a minimal service discovery. The QBluetoothServiceInfo objects returned may be incomplete and are only guaranteed to contain device and service UUID information. FullDiscovery Performs a full service discovery.
This enum describes errors that can occur during service discovery.
NoError No error. DeviceDiscoveryError Error occurred during device discovery. UnknownError An unidentified error occurred.
- UnknownError = 100
Constructs a new QBluetoothServiceDiscoveryAgent with parent.
Services will be discovered on all contactable devices.
Constructs a new QBluetoothServiceDiscoveryAgent for remoteAddress and with parent.
If remoteAddress is null services will be discovred on all contactable Bluetooth devices.
Returns the type of error that last occurred.
If service discovery is done on a signle address it will returns errors when trying to discover services on that device. If the alternate constructor is used and devices are discovered by a scan, then errors doing service discovery on individual devices are not saved and no signals are emitted. In this case errors are fairly normal since some devices may not respond to discovery or may no longer be in range. As such errors are surpressed. If no services are returned, it can be assumed no services could be discovered.
Returns a human-readable description of the last error that occurred when doing service discovery on a single device.
Returns true if service discovery is currently active, otherwise returns false.
Sets the UUID filter to uuids.
This is an overloaded member function, provided for convenience.
Sets the UUID filter to a list containing the single element uuid.
Clears the results of a previous service discovery.
Starts service discovery.
mode specifies the type of service discovery to perform.
Stops service discovery.
Signals the cancellation of the service discovery.
This signal is emitted when an error occurs.
The error parameter describes the error that occurred.
This signal is emitted when Bluetooth service discovery completes.
This signal is emitted when the Bluetooth service described by info is discovered.
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