/examples/corelib/ipc/localfortuneclient/client.cpp
C++ | 162 lines | 92 code | 19 blank | 51 comment | 8 complexity | ec2a1d2805e097c997e3854b855287c7 MD5 | raw file
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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, &QLocalSocket::errorOccurred, 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());
- }