server.cpp Example File

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#include <QtWidgets> #include <QtNetwork> #include <QtCore> #include "server.h" Server::Server(QWidget *parent) : QDialog(parent) , statusLabel(new QLabel) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); statusLabel->setTextInteractionFlags(Qt::TextBrowserInteraction); QNetworkConfigurationManager manager; if (manager.capabilities() & QNetworkConfigurationManager::NetworkSessionRequired) { // Get saved network configuration QSettings settings(QSettings::UserScope, QLatin1String("QtProject")); settings.beginGroup(QLatin1String("QtNetwork")); const QString id = settings.value(QLatin1String("DefaultNetworkConfiguration")).toString(); settings.endGroup(); // If the saved network configuration is not currently discovered use the system default QNetworkConfiguration config = manager.configurationFromIdentifier(id); if ((config.state() & QNetworkConfiguration::Discovered) != QNetworkConfiguration::Discovered) { config = manager.defaultConfiguration(); } networkSession = new QNetworkSession(config, this); connect(networkSession, &QNetworkSession::opened, this, &Server::sessionOpened); statusLabel->setText(tr("Opening network session.")); networkSession->open(); } else { sessionOpened(); } 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."); auto quitButton = new QPushButton(tr("Quit")); quitButton->setAutoDefault(false); connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close); connect(tcpServer, &QTcpServer::newConnection, this, &Server::sendFortune); auto buttonLayout = new QHBoxLayout; buttonLayout->addStretch(1); buttonLayout->addWidget(quitButton); buttonLayout->addStretch(1); QVBoxLayout *mainLayout = nullptr; if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) { auto outerVerticalLayout = new QVBoxLayout(this); outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); auto outerHorizontalLayout = new QHBoxLayout; outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); auto groupBox = new QGroupBox(QGuiApplication::applicationDisplayName()); mainLayout = new QVBoxLayout(groupBox); outerHorizontalLayout->addWidget(groupBox); outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); outerVerticalLayout->addLayout(outerHorizontalLayout); outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); } else { mainLayout = new QVBoxLayout(this); } mainLayout->addWidget(statusLabel); mainLayout->addLayout(buttonLayout); setWindowTitle(QGuiApplication::applicationDisplayName()); } void Server::sessionOpened() { // Save the used configuration if (networkSession) { QNetworkConfiguration config = networkSession->configuration(); QString id; if (config.type() == QNetworkConfiguration::UserChoice) id = networkSession->sessionProperty(QLatin1String("UserChoiceConfiguration")).toString(); else id = config.identifier(); QSettings settings(QSettings::UserScope, QLatin1String("QtProject")); settings.beginGroup(QLatin1String("QtNetwork")); settings.setValue(QLatin1String("DefaultNetworkConfiguration"), id); settings.endGroup(); } tcpServer = new QTcpServer(this); if (!tcpServer->listen()) { QMessageBox::critical(this, tr("Fortune Server"), tr("Unable to start the server: %1.") .arg(tcpServer->errorString())); close(); return; } QString ipAddress; QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); // use the first non-localhost IPv4 address for (int i = 0; i < ipAddressesList.size(); ++i) { if ( != QHostAddress::LocalHost && { ipAddress =; break; } } // if we did not find one, use IPv4 localhost if (ipAddress.isEmpty()) ipAddress = QHostAddress(QHostAddress::LocalHost).toString(); statusLabel->setText(tr("The server is running on\n\nIP: %1\nport: %2\n\n" "Run the Fortune Client example now.") .arg(ipAddress).arg(tcpServer->serverPort())); } void Server::sendFortune() { QByteArray block; QDataStream out(&block, QIODevice::WriteOnly); out.setVersion(QDataStream::Qt_5_10); out << fortunes[QRandomGenerator::global()->bounded(fortunes.size())]; QTcpSocket *clientConnection = tcpServer->nextPendingConnection(); connect(clientConnection, &QAbstractSocket::disconnected, clientConnection, &QObject::deleteLater); clientConnection->write(block); clientConnection->disconnectFromHost(); }

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