client.cpp Example File
network/fortuneclient/client.cpp
#include <QtGui>
#include <QtNetwork>
#include "client.h"
Client::Client(QWidget *parent)
: QDialog(parent)
{
hostLabel = new QLabel(tr("&Server name:"), this);
portLabel = new QLabel(tr("S&erver port:"), this);
hostLineEdit = new QLineEdit("Localhost", this);
portLineEdit = new QLineEdit(this);
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."), this);
getFortuneButton = new QPushButton(tr("Get Fortune"), this);
getFortuneButton->setDefault(true);
getFortuneButton->setEnabled(false);
quitButton = new QPushButton(tr("Quit"), this);
tcpSocket = new QTcpSocket(this);
connect(hostLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(portLineEdit, SIGNAL(textChanged(const QString &)),
this, SLOT(enableGetFortuneButton()));
connect(getFortuneButton, SIGNAL(clicked()),
this, SLOT(requestNewFortune()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune()));
connect(tcpSocket, SIGNAL(error(int)), this, SLOT(displayError(int)));
QHBoxLayout *buttonLayout = new QHBoxLayout;
buttonLayout->addStretch(1);
buttonLayout->addWidget(getFortuneButton);
buttonLayout->addWidget(quitButton);
QGridLayout *mainLayout = new QGridLayout(this);
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->addLayout(buttonLayout, 3, 0, 1, 2);
setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();
}
void Client::requestNewFortune()
{
blockSize = 0;
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
}
void Client::readFortune()
{
QDataStream in(tcpSocket);
in.setVersion(QDataStream::Qt_4_0);
if (blockSize == 0) {
if (tcpSocket->bytesAvailable() < sizeof(Q_UINT16))
return;
in >> blockSize;
}
if (tcpSocket->bytesAvailable() < blockSize)
return;
QString nextFortune;
in >> nextFortune;
if (nextFortune == currentFortune) {
requestNewFortune();
return;
}
currentFortune = nextFortune;
statusLabel->setText(currentFortune);
}
void Client::displayError(int socketError)
{
switch (socketError) {
case Qt::HostNotFoundError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The host was not found. Please check the "
"host name and port settings."));
break;
case Qt::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()));
}
}
void Client::enableGetFortuneButton()
{
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}