Qt 5.11 | Qt Network | Network Chat Example | client.cpp Example File

Qt 5.11.3 Reference Documentation

# client.cpp Example File

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(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();
      }