client.cpp Example File

ipc/localfortuneclient/client.cpp
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#include <QtWidgets> #include <QtNetwork> #include "client.h" Client::Client(QWidget *parent) : QDialog(parent), hostLineEdit(new QLineEdit("fortune")), getFortuneButton(new QPushButton(tr("Get Fortune"))), statusLabel(new QLabel(tr("This examples requires that you run the " "Local Fortune Server example as well."))), socket(new QLocalSocket(this)) { setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint); QLabel *hostLabel = new QLabel(tr("&Server name:")); hostLabel->setBuddy(hostLineEdit); statusLabel->setWordWrap(true); getFortuneButton->setDefault(true); QPushButton *quitButton = new QPushButton(tr("Quit")); QDialogButtonBox *buttonBox = new QDialogButtonBox; buttonBox->addButton(getFortuneButton, QDialogButtonBox::ActionRole); buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole); in.setDevice(socket); in.setVersion(QDataStream::Qt_5_10); connect(hostLineEdit, &QLineEdit::textChanged, this, &Client::enableGetFortuneButton); connect(getFortuneButton, &QPushButton::clicked, this, &Client::requestNewFortune); connect(quitButton, &QPushButton::clicked, this, &Client::close); connect(socket, &QLocalSocket::readyRead, this, &Client::readFortune); connect(socket, QOverload<QLocalSocket::LocalSocketError>::of(&QLocalSocket::error), this, &Client::displayError); QGridLayout *mainLayout = new QGridLayout(this); mainLayout->addWidget(hostLabel, 0, 0); mainLayout->addWidget(hostLineEdit, 0, 1); mainLayout->addWidget(statusLabel, 2, 0, 1, 2); mainLayout->addWidget(buttonBox, 3, 0, 1, 2); setWindowTitle(QGuiApplication::applicationDisplayName()); hostLineEdit->setFocus(); } void Client::requestNewFortune() { getFortuneButton->setEnabled(false); blockSize = 0; socket->abort(); socket->connectToServer(hostLineEdit->text()); } void Client::readFortune() { if (blockSize == 0) { // Relies on the fact that QDataStream serializes 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, &Client::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("Local Fortune Client"), tr("The host was not found. Please make sure " "that the server is running and that the " "server name is correct.")); break; case QLocalSocket::ConnectionRefusedError: QMessageBox::information(this, tr("Local Fortune Client"), tr("The connection was refused by the peer. " "Make sure the fortune server is running, " "and check that the server name " "is correct.")); break; case QLocalSocket::PeerClosedError: break; default: QMessageBox::information(this, tr("Local 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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