qt5base-lts/examples/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();
}