devicefinder.cpp Example File

heartrate-game/devicefinder.cpp
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#include "devicefinder.h" #include "devicehandler.h" #include "deviceinfo.h" DeviceFinder::DeviceFinder(DeviceHandler *handler, QObject *parent): BluetoothBaseClass(parent), m_deviceHandler(handler) { m_deviceDiscoveryAgent = new QBluetoothDeviceDiscoveryAgent(this); m_deviceDiscoveryAgent->setLowEnergyDiscoveryTimeout(5000); connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::deviceDiscovered, this, &DeviceFinder::addDevice); connect(m_deviceDiscoveryAgent, static_cast<void (QBluetoothDeviceDiscoveryAgent::*)(QBluetoothDeviceDiscoveryAgent::Error)>(&QBluetoothDeviceDiscoveryAgent::error), this, &DeviceFinder::scanError); connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::finished, this, &DeviceFinder::scanFinished); connect(m_deviceDiscoveryAgent, &QBluetoothDeviceDiscoveryAgent::canceled, this, &DeviceFinder::scanFinished); #ifdef SIMULATOR m_demoTimer.setSingleShot(true); m_demoTimer.setInterval(2000); connect(&m_demoTimer, &QTimer::timeout, this, &DeviceFinder::scanFinished); #endif } DeviceFinder::~DeviceFinder() { qDeleteAll(m_devices); m_devices.clear(); } void DeviceFinder::startSearch() { clearMessages(); m_deviceHandler->setDevice(nullptr); qDeleteAll(m_devices); m_devices.clear(); emit devicesChanged(); #ifdef SIMULATOR m_demoTimer.start(); #else m_deviceDiscoveryAgent->start(QBluetoothDeviceDiscoveryAgent::LowEnergyMethod); #endif emit scanningChanged(); setInfo(tr("Scanning for devices...")); } void DeviceFinder::addDevice(const QBluetoothDeviceInfo &device) { // If device is LowEnergy-device, add it to the list if (device.coreConfigurations() & QBluetoothDeviceInfo::LowEnergyCoreConfiguration) { m_devices.append(new DeviceInfo(device)); setInfo(tr("Low Energy device found. Scanning more...")); emit devicesChanged(); } //... } void DeviceFinder::scanError(QBluetoothDeviceDiscoveryAgent::Error error) { if (error == QBluetoothDeviceDiscoveryAgent::PoweredOffError) setError(tr("The Bluetooth adaptor is powered off.")); else if (error == QBluetoothDeviceDiscoveryAgent::InputOutputError) setError(tr("Writing or reading from the device resulted in an error.")); else setError(tr("An unknown error has occurred.")); } void DeviceFinder::scanFinished() { #ifdef SIMULATOR // Only for testing for (int i = 0; i < 4; i++) m_devices.append(new DeviceInfo(QBluetoothDeviceInfo())); #endif if (m_devices.isEmpty()) setError(tr("No Low Energy devices found.")); else setInfo(tr("Scanning done.")); emit scanningChanged(); emit devicesChanged(); } void DeviceFinder::connectToService(const QString &address) { m_deviceDiscoveryAgent->stop(); DeviceInfo *currentDevice = nullptr; for (QObject *entry : qAsConst(m_devices)) { auto device = qobject_cast<DeviceInfo *>(entry); if (device && device->getAddress() == address ) { currentDevice = device; break; } } if (currentDevice) m_deviceHandler->setDevice(currentDevice); clearMessages(); } bool DeviceFinder::scanning() const { #ifdef SIMULATOR return m_demoTimer.isActive(); #else return m_deviceDiscoveryAgent->isActive(); #endif } QVariant DeviceFinder::devices() { return QVariant::fromValue(m_devices); }

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