- Qt 5.5
- Qt Bluetooth
- Bluetooth Chat Example
- chat.cpp Example File
- Qt 5.5.1 Reference Documentation

# chat.cpp Example File

btchat/chat.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the QtBluetooth module of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
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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>

    #include <QTimer>

    #include <QDebug>

    static const QLatin1String serviceUuid("e8e10f95-1a70-4b27-9ccf-02010264e9c8");

    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);
        remoteSelector.startDiscovery(QBluetoothUuid(serviceUuid));
        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();
    }