Qt 5.11 | Qt Bluetooth | Bluetooth Chat Example | chat.cpp Example File

Qt 5.11.3 Reference Documentation

# chat.cpp Example File

btchat/chat.cpp

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      #include "chat.h"
      #include "remoteselector.h"
      #include "chatserver.h"
      #include "chatclient.h"

      #include <qbluetoothuuid.h>
      #include <qbluetoothserver.h>
      #include <qbluetoothservicediscoveryagent.h>
      #include <qbluetoothdeviceinfo.h>
      #include <qbluetoothlocaldevice.h>

      #ifdef Q_OS_ANDROID
      #include <QtAndroidExtras/QtAndroid>
      #endif

      #include <QTimer>

      #include <QDebug>

      static const QLatin1String serviceUuid("e8e10f95-1a70-4b27-9ccf-02010264e9c8");
      #ifdef Q_OS_ANDROID
      static const QLatin1String reverseUuid("c8e96402-0102-cf9c-274b-701a950fe1e8");
      #endif

      Chat::Chat(QWidget *parent)
          : QDialog(parent),  currentAdapterIndex(0), ui(new Ui_Chat)
      {
          ui->setupUi(this);

          connect(ui->quitButton, SIGNAL(clicked()), this, SLOT(accept()));
          connect(ui->connectButton, SIGNAL(clicked()), this, SLOT(connectClicked()));
          connect(ui->sendButton, SIGNAL(clicked()), this, SLOT(sendClicked()));

          localAdapters = QBluetoothLocalDevice::allDevices();
          if (localAdapters.count() < 2) {
              ui->localAdapterBox->setVisible(false);
          } else {
              //we ignore more than two adapters
              ui->localAdapterBox->setVisible(true);
              ui->firstAdapter->setText(tr("Default (%1)", "%1 = Bluetooth address").
                                        arg(localAdapters.at(0).address().toString()));
              ui->secondAdapter->setText(localAdapters.at(1).address().toString());
              ui->firstAdapter->setChecked(true);
              connect(ui->firstAdapter, SIGNAL(clicked()), this, SLOT(newAdapterSelected()));
              connect(ui->secondAdapter, SIGNAL(clicked()), this, SLOT(newAdapterSelected()));
              QBluetoothLocalDevice adapter(localAdapters.at(0).address());
              adapter.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
          }

          server = new ChatServer(this);
          connect(server, SIGNAL(clientConnected(QString)), this, SLOT(clientConnected(QString)));
          connect(server, SIGNAL(clientDisconnected(QString)), this, SLOT(clientDisconnected(QString)));
          connect(server, SIGNAL(messageReceived(QString,QString)),
                  this, SLOT(showMessage(QString,QString)));
          connect(this, SIGNAL(sendMessage(QString)), server, SLOT(sendMessage(QString)));
          server->startServer();

          localName = QBluetoothLocalDevice().name();
      }

      Chat::~Chat()
      {
          qDeleteAll(clients);
          delete server;
      }

      void Chat::clientConnected(const QString &name)
      {
          ui->chat->insertPlainText(QString::fromLatin1("%1 has joined chat.\n").arg(name));
      }

      void Chat::clientDisconnected(const QString &name)
      {
          ui->chat->insertPlainText(QString::fromLatin1("%1 has left.\n").arg(name));
      }

      void Chat::connected(const QString &name)
      {
          ui->chat->insertPlainText(QString::fromLatin1("Joined chat with %1.\n").arg(name));
      }

      void Chat::newAdapterSelected()
      {
          const int newAdapterIndex = adapterFromUserSelection();
          if (currentAdapterIndex != newAdapterIndex) {
              server->stopServer();
              currentAdapterIndex = newAdapterIndex;
              const QBluetoothHostInfo info = localAdapters.at(currentAdapterIndex);
              QBluetoothLocalDevice adapter(info.address());
              adapter.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
              server->startServer(info.address());
              localName = info.name();
          }
      }

      int Chat::adapterFromUserSelection() const
      {
          int result = 0;
          QBluetoothAddress newAdapter = localAdapters.at(0).address();

          if (ui->secondAdapter->isChecked()) {
              newAdapter = localAdapters.at(1).address();
              result = 1;
          }
          return result;
      }

      void Chat::clientDisconnected()
      {
          ChatClient *client = qobject_cast<ChatClient *>(sender());
          if (client) {
              clients.removeOne(client);
              client->deleteLater();
          }
      }

      void Chat::connectClicked()
      {
          ui->connectButton->setEnabled(false);

          // scan for services
          const QBluetoothAddress adapter = localAdapters.isEmpty() ?
                                                 QBluetoothAddress() :
                                                 localAdapters.at(currentAdapterIndex).address();

          RemoteSelector remoteSelector(adapter);
      #ifdef Q_OS_ANDROID
          if (QtAndroid::androidSdkVersion() >= 23)
              remoteSelector.startDiscovery(QBluetoothUuid(reverseUuid));
          else
              remoteSelector.startDiscovery(QBluetoothUuid(serviceUuid));
      #else
          remoteSelector.startDiscovery(QBluetoothUuid(serviceUuid));
      #endif
          if (remoteSelector.exec() == QDialog::Accepted) {
              QBluetoothServiceInfo service = remoteSelector.service();

              qDebug() << "Connecting to service 2" << service.serviceName()
                       << "on" << service.device().name();

              // Create client
              qDebug() << "Going to create client";
              ChatClient *client = new ChatClient(this);
      qDebug() << "Connecting...";

              connect(client, SIGNAL(messageReceived(QString,QString)),
                      this, SLOT(showMessage(QString,QString)));
              connect(client, SIGNAL(disconnected()), this, SLOT(clientDisconnected()));
              connect(client, SIGNAL(connected(QString)), this, SLOT(connected(QString)));
              connect(this, SIGNAL(sendMessage(QString)), client, SLOT(sendMessage(QString)));
      qDebug() << "Start client";
              client->startClient(service);

              clients.append(client);
          }

          ui->connectButton->setEnabled(true);
      }

      void Chat::sendClicked()
      {
          ui->sendButton->setEnabled(false);
          ui->sendText->setEnabled(false);

          showMessage(localName, ui->sendText->text());
          emit sendMessage(ui->sendText->text());

          ui->sendText->clear();

          ui->sendText->setEnabled(true);
          ui->sendButton->setEnabled(true);
      }

      void Chat::showMessage(const QString &sender, const QString &message)
      {
          ui->chat->insertPlainText(QString::fromLatin1("%1: %2\n").arg(sender, message));
          ui->chat->ensureCursorVisible();
      }