Qt 5.11 | Qt Bluetooth | Bluetooth Scanner Example | device.cpp Example File

Qt 5.11.3 Reference Documentation

# device.cpp Example File

btscanner/device.cpp

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      #include "device.h"
      #include "service.h"

      #include <qbluetoothaddress.h>
      #include <qbluetoothdevicediscoveryagent.h>
      #include <qbluetoothlocaldevice.h>
      #include <QMenu>
      #include <QDebug>

      DeviceDiscoveryDialog::DeviceDiscoveryDialog(QWidget *parent)
      :   QDialog(parent), localDevice(new QBluetoothLocalDevice),
          ui(new Ui_DeviceDiscovery)
      {
          ui->setupUi(this);

          /*
           * In case of multiple Bluetooth adapters it is possible to set adapter
           * which will be used. Example code:
           *
           * QBluetoothAddress address("XX:XX:XX:XX:XX:XX");
           * discoveryAgent = new QBluetoothDeviceDiscoveryAgent(address);
           *
           **/

          discoveryAgent = new QBluetoothDeviceDiscoveryAgent();

          connect(ui->inquiryType, SIGNAL(toggled(bool)), this, SLOT(setGeneralUnlimited(bool)));
          connect(ui->scan, SIGNAL(clicked()), this, SLOT(startScan()));

          connect(discoveryAgent, SIGNAL(deviceDiscovered(QBluetoothDeviceInfo)),
                  this, SLOT(addDevice(QBluetoothDeviceInfo)));
          connect(discoveryAgent, SIGNAL(finished()), this, SLOT(scanFinished()));

          connect(ui->list, SIGNAL(itemActivated(QListWidgetItem*)),
                  this, SLOT(itemActivated(QListWidgetItem*)));

          connect(localDevice, SIGNAL(hostModeStateChanged(QBluetoothLocalDevice::HostMode)),
                  this, SLOT(hostModeStateChanged(QBluetoothLocalDevice::HostMode)));

          hostModeStateChanged(localDevice->hostMode());
          // add context menu for devices to be able to pair device
          ui->list->setContextMenuPolicy(Qt::CustomContextMenu);
          connect(ui->list, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(displayPairingMenu(QPoint)));
          connect(localDevice, SIGNAL(pairingFinished(QBluetoothAddress,QBluetoothLocalDevice::Pairing))
              , this, SLOT(pairingDone(QBluetoothAddress,QBluetoothLocalDevice::Pairing)));

      }

      DeviceDiscoveryDialog::~DeviceDiscoveryDialog()
      {
          delete discoveryAgent;
      }

      void DeviceDiscoveryDialog::addDevice(const QBluetoothDeviceInfo &info)
      {
          QString label = QString("%1 %2").arg(info.address().toString()).arg(info.name());
          QList<QListWidgetItem *> items = ui->list->findItems(label, Qt::MatchExactly);
          if (items.empty()) {
              QListWidgetItem *item = new QListWidgetItem(label);
              QBluetoothLocalDevice::Pairing pairingStatus = localDevice->pairingStatus(info.address());
              if (pairingStatus == QBluetoothLocalDevice::Paired || pairingStatus == QBluetoothLocalDevice::AuthorizedPaired )
                  item->setTextColor(QColor(Qt::green));
              else
                  item->setTextColor(QColor(Qt::black));

              ui->list->addItem(item);
          }

      }

      void DeviceDiscoveryDialog::startScan()
      {
          discoveryAgent->start();
          ui->scan->setEnabled(false);
          ui->inquiryType->setEnabled(false);
      }

      void DeviceDiscoveryDialog::scanFinished()
      {
          ui->scan->setEnabled(true);
          ui->inquiryType->setEnabled(true);
      }

      void DeviceDiscoveryDialog::setGeneralUnlimited(bool unlimited)
      {
          if (unlimited)
              discoveryAgent->setInquiryType(QBluetoothDeviceDiscoveryAgent::GeneralUnlimitedInquiry);
          else
              discoveryAgent->setInquiryType(QBluetoothDeviceDiscoveryAgent::LimitedInquiry);
      }

      void DeviceDiscoveryDialog::itemActivated(QListWidgetItem *item)
      {
          QString text = item->text();

          int index = text.indexOf(' ');

          if (index == -1)
              return;

          QBluetoothAddress address(text.left(index));
          QString name(text.mid(index + 1));

          ServiceDiscoveryDialog d(name, address);
          d.exec();
      }

      void DeviceDiscoveryDialog::on_discoverable_clicked(bool clicked)
      {
          if (clicked)
              localDevice->setHostMode(QBluetoothLocalDevice::HostDiscoverable);
          else
              localDevice->setHostMode(QBluetoothLocalDevice::HostConnectable);
      }

      void DeviceDiscoveryDialog::on_power_clicked(bool clicked)
      {
          if (clicked)
              localDevice->powerOn();
          else
              localDevice->setHostMode(QBluetoothLocalDevice::HostPoweredOff);
      }

      void DeviceDiscoveryDialog::hostModeStateChanged(QBluetoothLocalDevice::HostMode mode)
      {
          if (mode != QBluetoothLocalDevice::HostPoweredOff)
              ui->power->setChecked(true);
          else
             ui->power->setChecked( false);

          if (mode == QBluetoothLocalDevice::HostDiscoverable)
              ui->discoverable->setChecked(true);
          else
              ui->discoverable->setChecked(false);

          bool on = !(mode == QBluetoothLocalDevice::HostPoweredOff);

          ui->scan->setEnabled(on);
          ui->discoverable->setEnabled(on);
      }
      void DeviceDiscoveryDialog::displayPairingMenu(const QPoint &pos)
      {
          if (ui->list->count() == 0)
              return;
          QMenu menu(this);
          QAction *pairAction = menu.addAction("Pair");
          QAction *removePairAction = menu.addAction("Remove Pairing");
          QAction *chosenAction = menu.exec(ui->list->viewport()->mapToGlobal(pos));
          QListWidgetItem *currentItem = ui->list->currentItem();

          QString text = currentItem->text();
          int index = text.indexOf(' ');
          if (index == -1)
              return;

          QBluetoothAddress address (text.left(index));
          if (chosenAction == pairAction) {
              localDevice->requestPairing(address, QBluetoothLocalDevice::Paired);
          } else if (chosenAction == removePairAction) {
              localDevice->requestPairing(address, QBluetoothLocalDevice::Unpaired);
          }
      }
      void DeviceDiscoveryDialog::pairingDone(const QBluetoothAddress &address, QBluetoothLocalDevice::Pairing pairing)
      {
          QList<QListWidgetItem *> items = ui->list->findItems(address.toString(), Qt::MatchContains);

          if (pairing == QBluetoothLocalDevice::Paired || pairing == QBluetoothLocalDevice::AuthorizedPaired ) {
              for (int var = 0; var < items.count(); ++var) {
                  QListWidgetItem *item = items.at(var);
                  item->setTextColor(QColor(Qt::green));
              }
          } else {
              for (int var = 0; var < items.count(); ++var) {
                  QListWidgetItem *item = items.at(var);
                  item->setTextColor(QColor(Qt::red));
              }
          }
      }