Mega Code Archive
Loopback QTcpServer and QTcpSocket
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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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** This file is part of the examples of the Qt Toolkit.
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#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QTcpServer>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QProgressBar;
class QPushButton;
class QTcpServer;
class QTcpSocket;
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = 0);
public slots:
void start();
void acceptConnection();
void startTransfer();
void updateServerProgress();
void updateClientProgress(qint64 numBytes);
void displayError(QAbstractSocket::SocketError socketError);
private:
QProgressBar *clientProgressBar;
QProgressBar *serverProgressBar;
QLabel *clientStatusLabel;
QLabel *serverStatusLabel;
QPushButton *startButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QTcpServer tcpServer;
QTcpSocket tcpClient;
QTcpSocket *tcpServerConnection;
int bytesToWrite;
int bytesWritten;
int bytesReceived;
};
#endif
#include <QtGui>
#include <QtNetwork>
#include "dialog.h"
#if !defined(Q_OS_WINCE)
static const int TotalBytes = 50 * 1024 * 1024;
#else
static const int TotalBytes = 5 * 1024 * 1024;
#endif
static const int PayloadSize = 65536;
Dialog::Dialog(QWidget *parent)
: QDialog(parent)
{
clientProgressBar = new QProgressBar;
clientStatusLabel = new QLabel(tr("Client ready"));
serverProgressBar = new QProgressBar;
serverStatusLabel = new QLabel(tr("Server ready"));
startButton = new QPushButton(tr("&Start"));
quitButton = new QPushButton(tr("&Quit"));
buttonBox = new QDialogButtonBox;
buttonBox->addButton(startButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
connect(startButton, SIGNAL(clicked()), this, SLOT(start()));
connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));
connect(&tcpServer, SIGNAL(newConnection()),
this, SLOT(acceptConnection()));
connect(&tcpClient, SIGNAL(connected()), this, SLOT(startTransfer()));
connect(&tcpClient, SIGNAL(bytesWritten(qint64)),
this, SLOT(updateClientProgress(qint64)));
connect(&tcpClient, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(displayError(QAbstractSocket::SocketError)));
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addWidget(clientProgressBar);
mainLayout->addWidget(clientStatusLabel);
mainLayout->addWidget(serverProgressBar);
mainLayout->addWidget(serverStatusLabel);
mainLayout->addStretch(1);
mainLayout->addSpacing(10);
mainLayout->addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr("Loopback"));
}
void Dialog::start()
{
startButton->setEnabled(false);
#ifndef QT_NO_CURSOR
QApplication::setOverrideCursor(Qt::WaitCursor);
#endif
bytesWritten = 0;
bytesReceived = 0;
while (!tcpServer.isListening() && !tcpServer.listen()) {
QMessageBox::StandardButton ret = QMessageBox::critical(this,
tr("Loopback"),
tr("Unable to start the test: %1.")
.arg(tcpServer.errorString()),
QMessageBox::Retry
| QMessageBox::Cancel);
if (ret == QMessageBox::Cancel)
return;
}
serverStatusLabel->setText(tr("Listening"));
clientStatusLabel->setText(tr("Connecting"));
tcpClient.connectToHost(QHostAddress::LocalHost, tcpServer.serverPort());
}
void Dialog::acceptConnection()
{
tcpServerConnection = tcpServer.nextPendingConnection();
connect(tcpServerConnection, SIGNAL(readyRead()),
this, SLOT(updateServerProgress()));
connect(tcpServerConnection, SIGNAL(error(QAbstractSocket::SocketError)),
this, SLOT(displayError(QAbstractSocket::SocketError)));
serverStatusLabel->setText(tr("Accepted connection"));
tcpServer.close();
}
void Dialog::startTransfer()
{
bytesToWrite = TotalBytes - (int)tcpClient.write(QByteArray(PayloadSize, '@'));
clientStatusLabel->setText(tr("Connected"));
}
void Dialog::updateServerProgress()
{
bytesReceived += (int)tcpServerConnection->bytesAvailable();
tcpServerConnection->readAll();
serverProgressBar->setMaximum(TotalBytes);
serverProgressBar->setValue(bytesReceived);
serverStatusLabel->setText(tr("Received %1MB")
.arg(bytesReceived / (1024 * 1024)));
if (bytesReceived == TotalBytes) {
tcpServerConnection->close();
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}
}
void Dialog::updateClientProgress(qint64 numBytes)
{
bytesWritten += (int)numBytes;
if (bytesToWrite > 0)
bytesToWrite -= (int)tcpClient.write(QByteArray(qMin(bytesToWrite, PayloadSize), '@'));
clientProgressBar->setMaximum(TotalBytes);
clientProgressBar->setValue(bytesWritten);
clientStatusLabel->setText(tr("Sent %1MB")
.arg(bytesWritten / (1024 * 1024)));
}
void Dialog::displayError(QAbstractSocket::SocketError socketError)
{
if (socketError == QTcpSocket::RemoteHostClosedError)
return;
QMessageBox::information(this, tr("Network error"),
tr("The following error occurred: %1.")
.arg(tcpClient.errorString()));
tcpClient.close();
tcpServer.close();
clientProgressBar->reset();
serverProgressBar->reset();
clientStatusLabel->setText(tr("Client ready"));
serverStatusLabel->setText(tr("Server ready"));
startButton->setEnabled(true);
#ifndef QT_NO_CURSOR
QApplication::restoreOverrideCursor();
#endif
}
#include <QApplication>
#include "dialog.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
return dialog.exec();
}
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