chat.cpp Example File

btchat/chat.cpp
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 #include "chat.h"
 #include "remoteselector.h"
 #include "chatserver.h"
 #include "chatclient.h"

 #include <QtCore/qdebug.h>

 #include <QtBluetooth/qbluetoothdeviceinfo.h>
 #include <QtBluetooth/qbluetoothlocaldevice.h>
 #include <QtBluetooth/qbluetoothuuid.h>

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

 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), ui(new Ui_Chat)
 {
     ui->setupUi(this);

     connect(ui->quitButton, &QPushButton::clicked, this, &Chat::accept);
     connect(ui->connectButton, &QPushButton::clicked, this, &Chat::connectClicked);
     connect(ui->sendButton, &QPushButton::clicked, this, &Chat::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, &QRadioButton::clicked, this, &Chat::newAdapterSelected);
         connect(ui->secondAdapter, &QRadioButton::clicked, this, &Chat::newAdapterSelected);
         QBluetoothLocalDevice adapter(localAdapters.at(0).address());
         adapter.setHostMode(QBluetoothLocalDevice::HostDiscoverable);
     }

     server = new ChatServer(this);
     connect(server, QOverload<const QString &>::of(&ChatServer::clientConnected),
             this, &Chat::clientConnected);
     connect(server, QOverload<const QString &>::of(&ChatServer::clientDisconnected),
             this,  QOverload<const QString &>::of(&Chat::clientDisconnected));
     connect(server, &ChatServer::messageReceived,
             this,  &Chat::showMessage);
     connect(this, &Chat::sendMessage, server, &ChatServer::sendMessage);
     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::reactOnSocketError(const QString &error)
 {
     ui->chat->insertPlainText(error);
 }

 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, &ChatClient::messageReceived,
                 this, &Chat::showMessage);
         connect(client, &ChatClient::disconnected,
                 this, QOverload<>::of(&Chat::clientDisconnected));
         connect(client, QOverload<const QString &>::of(&ChatClient::connected),
                 this, &Chat::connected);
         connect(client, &ChatClient::socketErrorOccurred,
                 this, &Chat::reactOnSocketError);
         connect(this, &Chat::sendMessage, client, &ChatClient::sendMessage);
 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();
 }