- Qt 5.5
- Qt Network
- Network Chat Example
- client.cpp Example File
- Qt 5.5.1 Reference Documentation

# client.cpp Example File

network-chat/client.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** This file is part of the examples of the Qt Toolkit.
    **
    ** $QT_BEGIN_LICENSE:BSD$
    ** You may use this file under the terms of the BSD license as follows:
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    #include <QtNetwork>

    #include "client.h"
    #include "connection.h"
    #include "peermanager.h"

    Client::Client()
    {
        peerManager = new PeerManager(this);
        peerManager->setServerPort(server.serverPort());
        peerManager->startBroadcasting();

        QObject::connect(peerManager, SIGNAL(newConnection(Connection*)),
                         this, SLOT(newConnection(Connection*)));
        QObject::connect(&server, SIGNAL(newConnection(Connection*)),
                         this, SLOT(newConnection(Connection*)));
    }

    void Client::sendMessage(const QString &message)
    {
        if (message.isEmpty())
            return;

        QList<Connection *> connections = peers.values();
        foreach (Connection *connection, connections)
            connection->sendMessage(message);
    }

    QString Client::nickName() const
    {
        return QString(peerManager->userName()) + '@' + QHostInfo::localHostName()
               + ':' + QString::number(server.serverPort());
    }

    bool Client::hasConnection(const QHostAddress &senderIp, int senderPort) const
    {
        if (senderPort == -1)
            return peers.contains(senderIp);

        if (!peers.contains(senderIp))
            return false;

        QList<Connection *> connections = peers.values(senderIp);
        foreach (Connection *connection, connections) {
            if (connection->peerPort() == senderPort)
                return true;
        }

        return false;
    }

    void Client::newConnection(Connection *connection)
    {
        connection->setGreetingMessage(peerManager->userName());

        connect(connection, SIGNAL(error(QAbstractSocket::SocketError)),
                this, SLOT(connectionError(QAbstractSocket::SocketError)));
        connect(connection, SIGNAL(disconnected()), this, SLOT(disconnected()));
        connect(connection, SIGNAL(readyForUse()), this, SLOT(readyForUse()));
    }

    void Client::readyForUse()
    {
        Connection *connection = qobject_cast<Connection *>(sender());
        if (!connection || hasConnection(connection->peerAddress(),
                                         connection->peerPort()))
            return;

        connect(connection, SIGNAL(newMessage(QString,QString)),
                this, SIGNAL(newMessage(QString,QString)));

        peers.insert(connection->peerAddress(), connection);
        QString nick = connection->name();
        if (!nick.isEmpty())
            emit newParticipant(nick);
    }

    void Client::disconnected()
    {
        if (Connection *connection = qobject_cast<Connection *>(sender()))
            removeConnection(connection);
    }

    void Client::connectionError(QAbstractSocket::SocketError /* socketError */)
    {
        if (Connection *connection = qobject_cast<Connection *>(sender()))
            removeConnection(connection);
    }

    void Client::removeConnection(Connection *connection)
    {
        if (peers.contains(connection->peerAddress())) {
            peers.remove(connection->peerAddress());
            QString nick = connection->name();
            if (!nick.isEmpty())
                emit participantLeft(nick);
        }
        connection->deleteLater();
    }