в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

Admin: 1 версия: Импорт контента...

2010-05-25T10:25:03Z

1 версия: Импорт контента...

Новая страница

==QTcpSocket based client==

<source lang="cpp">
#ifndef CLIENT_H
#define CLIENT_H
#include <QDialog>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QLineEdit;
class QPushButton;
class QTcpSocket;
QT_END_NAMESPACE
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;
QLabel *statusLabel;
QPushButton *getFortuneButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpSocket *tcpSocket;
QString currentFortune;
quint16 blockSize;
};

#endif

#include <QtGui>
#include <QtNetwork>
#include "client.h"
Client::Client(QWidget *parent): QDialog(parent)
{
hostLabel = new QLabel(tr("&Server name:"));
portLabel = new QLabel(tr("S&erver port:"));
hostLineEdit = new QLineEdit("Localhost");
portLineEdit = new QLineEdit;
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."));
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);

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(QAbstractSocket::SocketError)),this, SLOT(displayError(QAbstractSocket::SocketError)));
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(statusLabel, 2, 0, 1, 2);
mainLayout->addWidget(buttonBox, 3, 0, 1, 2);
setLayout(mainLayout);
setWindowTitle(tr("Fortune Client"));
portLineEdit->setFocus();
}
void Client::requestNewFortune()
{
getFortuneButton->setEnabled(false);
blockSize = 0;
tcpSocket->abort();
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() < (int)sizeof(quint16))
return;
in >> blockSize;
}
if (tcpSocket->bytesAvailable() < blockSize)
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(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);
}
void Client::enableGetFortuneButton(){
getFortuneButton->setEnabled(!hostLineEdit->text().isEmpty()
&& !portLineEdit->text().isEmpty());
}

#include <QApplication>
#include "client.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Client client;
client.show();
return client.exec();
}

</source>

← Предыдущая	Версия 14:21, 25 мая 2010
(нет различий)

C++/Qt/QTcpSocket - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...