client.cpp Example File

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#include <QtWidgets> #include <QtNetwork> #include "client.h" Client::Client(QWidget *parent) : QDialog(parent) , hostCombo(new QComboBox) , portLineEdit(new QLineEdit) , getFortuneButton(new QPushButton(tr("Get Fortune"))) , tcpSocket(new QTcpSocket(this)) , networkSession(Q_NULLPTR) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); hostCombo->setEditable(true); // find out name of this machine QString name = QHostInfo::localHostName(); if (!name.isEmpty()) { hostCombo->addItem(name); QString domain = QHostInfo::localDomainName(); if (!domain.isEmpty()) hostCombo->addItem(name + QChar('.') + domain); } if (name != QLatin1String("localhost")) hostCombo->addItem(QString("localhost")); // find out IP addresses of this machine QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); // add non-localhost addresses for (int i = 0; i < ipAddressesList.size(); ++i) { if (! hostCombo->addItem(; } // add localhost addresses for (int i = 0; i < ipAddressesList.size(); ++i) { if ( hostCombo->addItem(; } portLineEdit->setValidator(new QIntValidator(1, 65535, this)); QLabel *hostLabel = new QLabel(tr("&Server name:")); hostLabel->setBuddy(hostCombo); QLabel *portLabel = new QLabel(tr("S&erver port:")); portLabel->setBuddy(portLineEdit); statusLabel = new QLabel(tr("This examples requires that you run the " "Fortune Server example as well.")); getFortuneButton->setDefault(true); getFortuneButton->setEnabled(false); QPushButton *quitButton = new QPushButton(tr("Quit")); QDialogButtonBox *buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); in.setDevice(tcpSocket); in.setVersion(QDataStream::Qt_4_0); connect(hostCombo, &QComboBox::editTextChanged, this, &Client::enableGetFortuneButton); connect(portLineEdit, &QLineEdit::textChanged, this, &Client::enableGetFortuneButton); connect(getFortuneButton, &QAbstractButton::clicked, this, &Client::requestNewFortune); connect(quitButton, &QAbstractButton::clicked, this, &QWidget::close); connect(tcpSocket, &QIODevice::readyRead, this, &Client::readFortune); connect(tcpSocket, QOverload<QAbstractSocket::SocketError>::of(&QAbstractSocket::error), this, &Client::displayError); QGridLayout *mainLayout = Q_NULLPTR; if (QGuiApplication::styleHints()->showIsFullScreen() || QGuiApplication::styleHints()->showIsMaximized()) { QVBoxLayout *outerVerticalLayout = new QVBoxLayout(this); outerVerticalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::Ignored, QSizePolicy::MinimumExpanding)); QHBoxLayout *outerHorizontalLayout = new QHBoxLayout; outerHorizontalLayout->addItem(new QSpacerItem(0, 0, QSizePolicy::MinimumExpanding, QSizePolicy::Ignored)); QGroupBox *groupBox = new QGroupBox(QGuiApplication::applicationDisplayName()); mainLayout = new QGridLayout(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 QGridLayout(this); } mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostCombo, 0, 1); mainLayout->addWidget(portLabel, 1, 0); mainLayout->addWidget(portLineEdit, 1, 1); mainLayout->addWidget(statusLabel, 2, 0, 1, 2); mainLayout->addWidget(buttonBox, 3, 0, 1, 2); setWindowTitle(QGuiApplication::applicationDisplayName()); portLineEdit->setFocus(); 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, &Client::sessionOpened); getFortuneButton->setEnabled(false); statusLabel->setText(tr("Opening network session.")); networkSession->open(); } } void Client::requestNewFortune() { getFortuneButton->setEnabled(false); tcpSocket->abort(); tcpSocket->connectToHost(hostCombo->currentText(), portLineEdit->text().toInt()); } void Client::readFortune() { in.startTransaction(); QString nextFortune; in >> nextFortune; if (!in.commitTransaction()) return; if (nextFortune == currentFortune) { QTimer::singleShot(0, this, &Client::requestNewFortune); return; } currentFortune = nextFortune; statusLabel->setText(currentFortune); getFortuneButton->setEnabled(true); } void Client::displayError(QAbstractSocket::SocketError socketError) { switch (socketError) { case QAbstractSocket::RemoteHostClosedError: break; case QAbstractSocket::HostNotFoundError: QMessageBox::information(this, tr("Fortune Client"), tr("The host was not found. Please check the " "host name and port settings.")); break; case QAbstractSocket::ConnectionRefusedError: QMessageBox::information(this, tr("Fortune Client"), tr("The connection was refused by the peer. " "Make sure the fortune server is running, " "and check that the host name and port " "settings are correct.")); break; default: QMessageBox::information(this, tr("Fortune Client"), tr("The following error occurred: %1.") .arg(tcpSocket->errorString())); } getFortuneButton->setEnabled(true); } void Client::enableGetFortuneButton() { getFortuneButton->setEnabled((!networkSession || networkSession->isOpen()) && !hostCombo->currentText().isEmpty() && !portLineEdit->text().isEmpty()); } void Client::sessionOpened() { // Save the used configuration 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(); statusLabel->setText(tr("This examples requires that you run the " "Fortune Server example as well.")); enableGetFortuneButton(); }

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