fortune client

代码摘自于网络：

//client.h
#ifndef CLIENT_H
#define CLIENT_H

#include <QDialog>
#include <QTcpSocket>

QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QLineEdit;
class QPushButton;
class QTcpSocket;
class QTextEdit;
QT_END_NAMESPACE

//! [0]
class Client : public QDialog
{
Q_OBJECT

public:
Client(QWidget *parent = 0);

private slots:
void requestNewFortune();
void readFortune();
void displayError(QAbstractSocket::SocketError socketError);
void enableGetFortuneButton();

private:
QLabel *hostLabel;
QLabel *portLabel;
QLineEdit *hostLineEdit;
QLineEdit *portLineEdit;
QTextEdit *textEdit;
QPushButton *getFortuneButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;

QTcpSocket *tcpSocket;
QString currentFortune;
quint16 blockSize;
#ifdef Q_OS_SYMBIAN
bool isDefaultIapSet;
#endif
};
//! [0]

#endif

//client.cpp
#include <QtGui>
#include <QtNetwork>

#include "client.h"

#ifdef Q_OS_SYMBIAN
#include "sym_iap_util.h"
#endif

//! [0]
Client::Client(QWidget *parent)
: QDialog(parent)
{
//! [0]
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);

textEdit = new QTextEdit;
textEdit->setReadOnly(true);
textEdit->append("This examples requires that you run the "
"Fortune Server example as well.");

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);

//! [1]
tcpSocket = new QTcpSocket(this);
//! [1]

connect(hostLineEdit, SIGNAL(textChanged(QString)),
this, SLOT(enableGetFortuneButton()));
connect(portLineEdit, SIGNAL(textChanged(QString)),
this, SLOT(enableGetFortuneButton()));
connect(getFortuneButton, SIGNAL(clicked()),
this, SLOT(requestNewFortune()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
//! [2] //! [3]
connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune()));
//! [2] //! [4]
connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),
//! [3]
this, SLOT(displayError(QAbstractSocket::SocketError)));
//! [4]

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(textEdit, 2, 0, 3, 2);
mainLayout->addWidget(buttonBox, 5, 0, 1, 2);
setLayout(mainLayout);

setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();

}

//主要是这个函数改了
void Client::requestNewFortune()
{
getFortuneButton->setEnabled(false);
for(int i=0;i<5;i++)
{
blockSize = 0;
tcpSocket->abort();
tcpSocket->connectToHost(hostLineEdit->text(),
portLineEdit->text().toInt());
}
}
//! [6]

//! [8]
void Client::readFortune()
{
//! [9]
QDataStream in(tcpSocket);
in.setVersion(QDataStream::Qt_4_0);

if (blockSize == 0) {
if (tcpSocket->bytesAvailable() < (int)sizeof(quint16))
return;
//! [8]

//! [10]
in >> blockSize;
}

if (tcpSocket->bytesAvailable() < blockSize)
return;
//! [10] //! [11]

QString nextFortune;
in >> nextFortune;

if (nextFortune == currentFortune) {
QTimer::singleShot(0, this, SLOT(requestNewFortune()));
return;
}
//! [11]

//! [12]
currentFortune = nextFortune;
//! [9]
textEdit->append(currentFortune);
getFortuneButton->setEnabled(true);
}
//! [12]

//! [13]
void Client::displayError(QAbstractSocket::SocketError socketError)
{
switch (socketError) {
case QAbstractSocket::RemoteHostClosedError:
break;
case QAbstractSocket::HostNotFoundError:
QMessageBox::information(this, tr("Fortune Client"),
tr("The host was not found. Please check the "
"host name and port settings."));
break;
case QAbstractSocket::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()));
}

getFortuneButton->setEnabled(true);
}
//! [13]

void Client::enableGetFortuneButton()
{
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}

#include "client.h"
#include <QtGui/QApplication>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);
Client client;
#ifdef Q_OS_SYMBIAN
// Make application better looking and more usable on small screen
client.showMaximized();
#else
client.show();
#endif
return a.exec();
}