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# client.cpp Example File
network/network-chat/client.cpp

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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(const QString &, const QString &)),
                 this, SIGNAL(newMessage(const QString &, const 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();
     }