Qt 5.6 | Qt Core | Local Fortune Server Example | server.cpp Example File

Qt 5.6.2 Reference Documentation

# server.cpp Example File

ipc/localfortuneserver/server.cpp

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      #include <QtWidgets>
      #include <QtNetwork>

      #include <stdlib.h>

      #include "server.h"
      #include <qlocalserver.h>
      #include <qlocalsocket.h>

      Server::Server(QWidget *parent)
          : QDialog(parent)
      {
          statusLabel = new QLabel;
          statusLabel->setWordWrap(true);
          quitButton = new QPushButton(tr("Quit"));
          quitButton->setAutoDefault(false);

          server = new QLocalServer(this);
          if (!server->listen("fortune")) {
              QMessageBox::critical(this, tr("Fortune Server"),
                                    tr("Unable to start the server: %1.")
                                    .arg(server->errorString()));
              close();
              return;
          }

          statusLabel->setText(tr("The server is running.\n"
                                  "Run the Fortune Client example now."));

          fortunes << tr("You've been leading a dog's life. Stay off the furniture.")
                   << tr("You've got to think about tomorrow.")
                   << tr("You will be surprised by a loud noise.")
                   << tr("You will feel hungry again in another hour.")
                   << tr("You might have mail.")
                   << tr("You cannot kill time without injuring eternity.")
                   << tr("Computers are not intelligent. They only think they are.");

          connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
          connect(server, SIGNAL(newConnection()), this, SLOT(sendFortune()));

          QHBoxLayout *buttonLayout = new QHBoxLayout;
          buttonLayout->addStretch(1);
          buttonLayout->addWidget(quitButton);
          buttonLayout->addStretch(1);

          QVBoxLayout *mainLayout = new QVBoxLayout;
          mainLayout->addWidget(statusLabel);
          mainLayout->addLayout(buttonLayout);
          setLayout(mainLayout);

          setWindowTitle(tr("Fortune Server"));
      }

      void Server::sendFortune()
      {
          QByteArray block;
          QDataStream out(&block, QIODevice::WriteOnly);
          out.setVersion(QDataStream::Qt_4_0);
          out << (quint16)0;
          out << fortunes.at(qrand() % fortunes.size());
          out.device()->seek(0);
          out << (quint16)(block.size() - sizeof(quint16));

          QLocalSocket *clientConnection = server->nextPendingConnection();
          connect(clientConnection, SIGNAL(disconnected()),
                  clientConnection, SLOT(deleteLater()));

          clientConnection->write(block);
          clientConnection->flush();
          clientConnection->disconnectFromServer();
      }