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Remove loopback network example

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It doesn't showcase anything interesting that other examples
don't already show off.

Pick-to: 6.5
Change-Id: Ie95c3ddb3ff52b3beab54bd6fa75fb75ae5c7ba5
Reviewed-by: Timur Pocheptsov <timur.pocheptsov@qt.io>
Reviewed-by: Konrad Kujawa <konrad.kujawa@qt.io>
This commit is contained in:
Mårten Nordheim 2023-03-21 10:16:04 +01:00
parent a156b667ce
commit 826b606a5d
13 changed files with 2 additions and 287 deletions
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1
doc/global/manifest-meta.qdocconf
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@ -113,7 +113,6 @@ manifestmeta.ios.names = "QtCore/Contiguous Cache Example" \
"QtCore/Queued Custom Type Example" \
"QtGui/OpenGL Window Example" \
"QtGui/Raster Window Example" \
"QtNetwork/Loopback Example" \
"QtNetwork/Network Chat Example" \
"QtNetwork/Torrent Example" \
"QtOpenGL/2D Painting Example" \

1
examples/network/CMakeLists.txt
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@ -12,7 +12,6 @@ if(TARGET Qt6::Widgets)
qt_internal_add_example(broadcastreceiver)
qt_internal_add_example(broadcastsender)
qt_internal_add_example(http)
qt_internal_add_example(loopback)
qt_internal_add_example(threadedfortuneserver)
qt_internal_add_example(torrent)
qt_internal_add_example(multicastreceiver)

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examples/network/doc/images/loopback-example.png
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14
examples/network/doc/src/loopback.qdoc
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@ -1,14 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\example loopback
\title Loopback Example
\ingroup examples-network
\brief Demonstrates the client-server communication on a local host.
The example demonstrates how the clients and servers on a local host
communicate with each other.
\image loopback-example.png
*/

38
examples/network/loopback/CMakeLists.txt
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@ -1,38 +0,0 @@
# Copyright (C) 2022 The Qt Company Ltd.
# SPDX-License-Identifier: BSD-3-Clause
cmake_minimum_required(VERSION 3.16)
project(loopback LANGUAGES CXX)
if(NOT DEFINED INSTALL_EXAMPLESDIR)
set(INSTALL_EXAMPLESDIR "examples")
endif()
set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/network/loopback")
find_package(Qt6 REQUIRED COMPONENTS Core Gui Network Widgets)
qt_standard_project_setup()
qt_add_executable(loopback
dialog.cpp dialog.h
main.cpp
)
set_target_properties(loopback PROPERTIES
WIN32_EXECUTABLE TRUE
MACOSX_BUNDLE TRUE
)
target_link_libraries(loopback PRIVATE
Qt6::Core
Qt6::Gui
Qt6::Network
Qt6::Widgets
)
install(TARGETS loopback
RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
)

155
examples/network/loopback/dialog.cpp
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@ -1,155 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "dialog.h"
#include <QtNetwork>
#include <QtWidgets>
static const int TotalBytes = 50 * 1024 * 1024;
static const int PayloadSize = 64 * 1024; // 64 KB
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, &QAbstractButton::clicked, this, &Dialog::start);
connect(quitButton, &QAbstractButton::clicked, qApp, &QCoreApplication::quit);
connect(&tcpServer, &QTcpServer::newConnection,
this, &Dialog::acceptConnection);
connect(&tcpClient, &QAbstractSocket::connected, this, &Dialog::startTransfer);
connect(&tcpClient, &QIODevice::bytesWritten,
this, &Dialog::updateClientProgress);
connect(&tcpClient, &QAbstractSocket::errorOccurred,
this, &Dialog::displayError);
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
QGuiApplication::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();
if (!tcpServerConnection) {
serverStatusLabel->setText(tr("Error: got invalid pending connection!"));
return;
}
connect(tcpServerConnection, &QIODevice::readyRead,
this, &Dialog::updateServerProgress);
connect(tcpServerConnection, &QAbstractSocket::errorOccurred,
this, &Dialog::displayError);
connect(tcpServerConnection, &QTcpSocket::disconnected,
tcpServerConnection, &QTcpSocket::deleteLater);
serverStatusLabel->setText(tr("Accepted connection"));
tcpServer.close();
}
void Dialog::startTransfer()
{
// called when the TCP client connected to the loopback server
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
QGuiApplication::restoreOverrideCursor();
#endif
}
}
void Dialog::updateClientProgress(qint64 numBytes)
{
// called when the TCP client has written some bytes
bytesWritten += int(numBytes);
// only write more if not finished and when the Qt write buffer is below a certain size.
if (bytesToWrite > 0 && tcpClient.bytesToWrite() <= 4 * PayloadSize)
bytesToWrite -= 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
QGuiApplication::restoreOverrideCursor();
#endif
}

51
examples/network/loopback/dialog.h
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@ -1,51 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#ifndef DIALOG_H
#define DIALOG_H
#include <QDialog>
#include <QTcpServer>
#include <QTcpSocket>
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QLabel;
class QProgressBar;
class QPushButton;
QT_END_NAMESPACE
class Dialog : public QDialog
{
Q_OBJECT
public:
Dialog(QWidget *parent = nullptr);
public slots:
void start();
void acceptConnection();
void startTransfer();
void updateServerProgress();
void updateClientProgress(qint64 numBytes);
void displayError(QAbstractSocket::SocketError socketError);
private:
QProgressBar *clientProgressBar = nullptr;
QProgressBar *serverProgressBar = nullptr;
QLabel *clientStatusLabel = nullptr;
QLabel *serverStatusLabel = nullptr;
QPushButton *startButton = nullptr;
QPushButton *quitButton = nullptr;
QDialogButtonBox *buttonBox = nullptr;
QTcpServer tcpServer;
QTcpSocket tcpClient;
QTcpSocket *tcpServerConnection = nullptr;
int bytesToWrite = 0;
int bytesWritten = 0;
int bytesReceived = 0;
};
#endif

9
examples/network/loopback/loopback.pro
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@ -1,9 +0,0 @@
QT += network widgets
HEADERS = dialog.h
SOURCES = dialog.cpp \
main.cpp
# install
target.path = $$[QT_INSTALL_EXAMPLES]/network/loopback
INSTALLS += target

14
examples/network/loopback/main.cpp
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@ -1,14 +0,0 @@
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "dialog.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
Dialog dialog;
dialog.show();
return app.exec();
}

1
examples/network/network.pro
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@ -9,7 +9,6 @@ qtHaveModule(widgets) {
broadcastreceiver \
broadcastsender \
http \
loopback \
threadedfortuneserver \
torrent \
multicastreceiver \

1
src/network/doc/src/examples.qdoc
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@ -26,7 +26,6 @@
\li \l{network/fortuneclient}{Fortune Client}\raisedaster
\li \l{network/fortuneserver}{Fortune Server}\raisedaster
\li \l{network/http}{HTTP}
\li \l{network/loopback}{Loopback}
\li \l{network/threadedfortuneserver}{Threaded Fortune Server}\raisedaster
\li \l{network/torrent}{Torrent}
\li \l{network/securesocketclient}{Secure Socket Client}

2
src/network/socket/qtcpserver.cpp
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@ -44,7 +44,7 @@
connection is available or a timeout expires.
\sa QTcpSocket, {Fortune Server}, {Threaded Fortune Server},
{Loopback Example}, {Torrent Example}
{Torrent Example}
*/
/*! \fn void QTcpServer::newConnection()

2
src/network/socket/qtcpsocket.cpp
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@ -25,7 +25,7 @@
\sa QTcpServer, QUdpSocket, QNetworkAccessManager,
{Fortune Server}, {Fortune Client},
{Threaded Fortune Server}, {Blocking Fortune Client},
{Loopback Example}, {Torrent Example}
{Torrent Example}
*/
#include "qtcpsocket.h"