blockingclient.cpp Example File

blockingfortuneclient/blockingclient.cpp
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#include <QtWidgets> #include <QtNetwork> #include "blockingclient.h" BlockingClient::BlockingClient(QWidget *parent) : QWidget(parent) { hostLabel = new QLabel(tr("&Server name:")); portLabel = new QLabel(tr("S&erver port:")); // find out which IP to connect to QString ipAddress; QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses(); // use the first non-localhost IPv4 address for (int i = 0; i < ipAddressesList.size(); ++i) { if (ipAddressesList.at(i) != QHostAddress::LocalHost && ipAddressesList.at(i).toIPv4Address()) { ipAddress = ipAddressesList.at(i).toString(); break; } } // if we did not find one, use IPv4 localhost if (ipAddress.isEmpty()) ipAddress = QHostAddress(QHostAddress::LocalHost).toString(); hostLineEdit = new QLineEdit(ipAddress); portLineEdit = new QLineEdit; portLineEdit->setValidator(new QIntValidator(1, 65535, this)); hostLabel->setBuddy(hostLineEdit); portLabel->setBuddy(portLineEdit); statusLabel = new QLabel(tr("This examples requires that you run the " "Fortune Server example as well.")); statusLabel->setWordWrap(true); getFortuneButton = new QPushButton(tr("Get Fortune")); getFortuneButton->setDefault(true); getFortuneButton->setEnabled(false); quitButton = new QPushButton(tr("Quit")); buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); connect(getFortuneButton, SIGNAL(clicked()), this, SLOT(requestNewFortune())); connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); connect(hostLineEdit, SIGNAL(textChanged(QString)), this, SLOT(enableGetFortuneButton())); connect(portLineEdit, SIGNAL(textChanged(QString)), this, SLOT(enableGetFortuneButton())); connect(&thread, SIGNAL(newFortune(QString)), this, SLOT(showFortune(QString))); connect(&thread, SIGNAL(error(int,QString)), this, SLOT(displayError(int,QString))); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostLineEdit, 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); setLayout(mainLayout); setWindowTitle(tr("Blocking Fortune Client")); portLineEdit->setFocus(); } void BlockingClient::requestNewFortune() { getFortuneButton->setEnabled(false); thread.requestNewFortune(hostLineEdit->text(), portLineEdit->text().toInt()); } void BlockingClient::showFortune(const QString &nextFortune) { if (nextFortune == currentFortune) { requestNewFortune(); return; } currentFortune = nextFortune; statusLabel->setText(currentFortune); getFortuneButton->setEnabled(true); } void BlockingClient::displayError(int socketError, const QString &message) { switch (socketError) { case QAbstractSocket::HostNotFoundError: QMessageBox::information(this, tr("Blocking Fortune Client"), tr("The host was not found. Please check the " "host and port settings.")); break; case QAbstractSocket::ConnectionRefusedError: QMessageBox::information(this, tr("Blocking 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("Blocking Fortune Client"), tr("The following error occurred: %1.") .arg(message)); } getFortuneButton->setEnabled(true); } void BlockingClient::enableGetFortuneButton() { bool enable(!hostLineEdit->text().isEmpty() && !portLineEdit->text().isEmpty()); getFortuneButton->setEnabled(enable); }