client.cpp Example File

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#include <QtWidgets> #include <QtNetwork> #include "client.h" Client::Client(QWidget *parent) : QDialog(parent) { hostLabel = new QLabel(tr("&Server name:")); hostLineEdit = new QLineEdit("fortune"); hostLabel->setBuddy(hostLineEdit); 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); quitButton = new QPushButton(tr("Quit")); buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); socket = new QLocalSocket(this); connect(hostLineEdit, SIGNAL(textChanged(QString)), this, SLOT(enableGetFortuneButton())); connect(getFortuneButton, SIGNAL(clicked()), this, SLOT(requestNewFortune())); connect(quitButton, SIGNAL(clicked()), this, SLOT(close())); connect(socket, SIGNAL(readyRead()), this, SLOT(readFortune())); connect(socket, SIGNAL(error(QLocalSocket::LocalSocketError)), this, SLOT(displayError(QLocalSocket::LocalSocketError))); QGridLayout *mainLayout = new QGridLayout; mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostLineEdit, 0, 1); mainLayout->addWidget(statusLabel, 2, 0, 1, 2); mainLayout->addWidget(buttonBox, 3, 0, 1, 2); setLayout(mainLayout); setWindowTitle(tr("Fortune Client")); hostLineEdit->setFocus(); } void Client::requestNewFortune() { getFortuneButton->setEnabled(false); blockSize = 0; socket->abort(); socket->connectToServer(hostLineEdit->text()); } void Client::readFortune() { QDataStream in(socket); in.setVersion(QDataStream::Qt_4_0); if (blockSize == 0) { // Relies on the fact that QDataStream format streams a quint32 into sizeof(quint32) bytes if (socket->bytesAvailable() < (int)sizeof(quint32)) return; in >> blockSize; } if (socket->bytesAvailable() < blockSize || in.atEnd()) return; QString nextFortune; in >> nextFortune; if (nextFortune == currentFortune) { QTimer::singleShot(0, this, SLOT(requestNewFortune())); return; } currentFortune = nextFortune; statusLabel->setText(currentFortune); getFortuneButton->setEnabled(true); } void Client::displayError(QLocalSocket::LocalSocketError socketError) { switch (socketError) { case QLocalSocket::ServerNotFoundError: QMessageBox::information(this, tr("Fortune Client"), tr("The host was not found. Please check the " "host name and port settings.")); break; case QLocalSocket::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; case QLocalSocket::PeerClosedError: break; default: QMessageBox::information(this, tr("Fortune Client"), tr("The following error occurred: %1.") .arg(socket->errorString())); } getFortuneButton->setEnabled(true); } void Client::enableGetFortuneButton() { getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()); }

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