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<h1 class="title">dialog.cpp Example File</h1>
<span class="subtitle">loopback/dialog.cpp</span>
<!-- $$$loopback/dialog.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "dialog.h"</span>
<span class="preprocessor">#include <QtNetwork></span>
<span class="preprocessor">#include <QtWidgets></span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> TotalBytes <span class="operator">=</span> <span class="number">50</span> <span class="operator">*</span> <span class="number">1024</span> <span class="operator">*</span> <span class="number">1024</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> PayloadSize <span class="operator">=</span> <span class="number">64</span> <span class="operator">*</span> <span class="number">1024</span>; <span class="comment">// 64 KB</span>
Dialog<span class="operator">::</span>Dialog(<span class="type">QWidget</span> <span class="operator">*</span>parent)
: <span class="type">QDialog</span>(parent)
{
clientProgressBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QProgressBar</span>;
clientStatusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">"Client ready"</span>));
serverProgressBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QProgressBar</span>;
serverStatusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QLabel</span>(tr(<span class="string">"Server ready"</span>));
startButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(tr(<span class="string">"&Start"</span>));
quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QPushButton</span>(tr(<span class="string">"&Quit"</span>));
buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QDialogButtonBox</span>;
buttonBox<span class="operator">-</span><span class="operator">></span>addButton(startButton<span class="operator">,</span> <span class="type">QDialogButtonBox</span><span class="operator">::</span>ActionRole);
buttonBox<span class="operator">-</span><span class="operator">></span>addButton(quitButton<span class="operator">,</span> <span class="type">QDialogButtonBox</span><span class="operator">::</span>RejectRole);
connect(startButton<span class="operator">,</span> <span class="operator">&</span><span class="type">QAbstractButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>start);
connect(quitButton<span class="operator">,</span> <span class="operator">&</span><span class="type">QAbstractButton</span><span class="operator">::</span>clicked<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span><span class="type">QWidget</span><span class="operator">::</span>close);
connect(<span class="operator">&</span>tcpServer<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qtcpserver.html">QTcpServer</a></span><span class="operator">::</span>newConnection<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>acceptConnection);
connect(<span class="operator">&</span>tcpClient<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>connected<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>startTransfer);
connect(<span class="operator">&</span>tcpClient<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>bytesWritten<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>updateClientProgress);
connect(<span class="operator">&</span>tcpClient<span class="operator">,</span> <span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>error)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>displayError);
<span class="type">QVBoxLayout</span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QVBoxLayout</span>;
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(clientProgressBar);
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(clientStatusLabel);
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(serverProgressBar);
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(serverStatusLabel);
mainLayout<span class="operator">-</span><span class="operator">></span>addStretch(<span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">></span>addSpacing(<span class="number">10</span>);
mainLayout<span class="operator">-</span><span class="operator">></span>addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr(<span class="string">"Loopback"</span>));
}
<span class="type">void</span> Dialog<span class="operator">::</span>start()
{
startButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">false</span>);
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type">QApplication</span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="../qtcore/qt.html">Qt</a></span><span class="operator">::</span>WaitCursor);
<span class="preprocessor">#endif</span>
bytesWritten <span class="operator">=</span> <span class="number">0</span>;
bytesReceived <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">while</span> (<span class="operator">!</span>tcpServer<span class="operator">.</span>isListening() <span class="operator">&</span><span class="operator">&</span> <span class="operator">!</span>tcpServer<span class="operator">.</span>listen()) {
<span class="type">QMessageBox</span><span class="operator">::</span>StandardButton ret <span class="operator">=</span> <span class="type">QMessageBox</span><span class="operator">::</span>critical(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">"Loopback"</span>)<span class="operator">,</span>
tr(<span class="string">"Unable to start the test: %1."</span>)
<span class="operator">.</span>arg(tcpServer<span class="operator">.</span>errorString())<span class="operator">,</span>
<span class="type">QMessageBox</span><span class="operator">::</span>Retry
<span class="operator">|</span> <span class="type">QMessageBox</span><span class="operator">::</span>Cancel);
<span class="keyword">if</span> (ret <span class="operator">=</span><span class="operator">=</span> <span class="type">QMessageBox</span><span class="operator">::</span>Cancel)
<span class="keyword">return</span>;
}
serverStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Listening"</span>));
clientStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Connecting"</span>));
tcpClient<span class="operator">.</span>connectToHost(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost<span class="operator">,</span> tcpServer<span class="operator">.</span>serverPort());
}
<span class="type">void</span> Dialog<span class="operator">::</span>acceptConnection()
{
tcpServerConnection <span class="operator">=</span> tcpServer<span class="operator">.</span>nextPendingConnection();
<span class="keyword">if</span> (<span class="operator">!</span>tcpServerConnection) {
serverStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Error: got invalid pending connection!"</span>));
<span class="keyword">return</span>;
}
connect(tcpServerConnection<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>readyRead<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>updateServerProgress);
connect(tcpServerConnection<span class="operator">,</span>
<span class="type">QOverload</span><span class="operator"><</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError<span class="operator">></span><span class="operator">::</span>of(<span class="operator">&</span><span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>error)<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> <span class="operator">&</span>Dialog<span class="operator">::</span>displayError);
connect(tcpServerConnection<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span><span class="operator">::</span>disconnected<span class="operator">,</span>
tcpServerConnection<span class="operator">,</span> <span class="operator">&</span><span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span><span class="operator">::</span>deleteLater);
serverStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Accepted connection"</span>));
tcpServer<span class="operator">.</span>close();
}
<span class="type">void</span> Dialog<span class="operator">::</span>startTransfer()
{
<span class="comment">// called when the TCP client connected to the loopback server</span>
bytesToWrite <span class="operator">=</span> TotalBytes <span class="operator">-</span> <span class="type">int</span>(tcpClient<span class="operator">.</span>write(<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span>(PayloadSize<span class="operator">,</span> <span class="char">'@'</span>)));
clientStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Connected"</span>));
}
<span class="type">void</span> Dialog<span class="operator">::</span>updateServerProgress()
{
bytesReceived <span class="operator">+</span><span class="operator">=</span> <span class="type">int</span>(tcpServerConnection<span class="operator">-</span><span class="operator">></span>bytesAvailable());
tcpServerConnection<span class="operator">-</span><span class="operator">></span>readAll();
serverProgressBar<span class="operator">-</span><span class="operator">></span>setMaximum(TotalBytes);
serverProgressBar<span class="operator">-</span><span class="operator">></span>setValue(bytesReceived);
serverStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Received %1MB"</span>)
<span class="operator">.</span>arg(bytesReceived <span class="operator">/</span> (<span class="number">1024</span> <span class="operator">*</span> <span class="number">1024</span>)));
<span class="keyword">if</span> (bytesReceived <span class="operator">=</span><span class="operator">=</span> TotalBytes) {
tcpServerConnection<span class="operator">-</span><span class="operator">></span>close();
startButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type">QApplication</span><span class="operator">::</span>restoreOverrideCursor();
<span class="preprocessor">#endif</span>
}
}
<span class="type">void</span> Dialog<span class="operator">::</span>updateClientProgress(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> numBytes)
{
<span class="comment">// called when the TCP client has written some bytes</span>
bytesWritten <span class="operator">+</span><span class="operator">=</span> <span class="type">int</span>(numBytes);
<span class="comment">// only write more if not finished and when the Qt write buffer is below a certain size.</span>
<span class="keyword">if</span> (bytesToWrite <span class="operator">></span> <span class="number">0</span> <span class="operator">&</span><span class="operator">&</span> tcpClient<span class="operator">.</span>bytesToWrite() <span class="operator"><</span><span class="operator">=</span> <span class="number">4</span> <span class="operator">*</span> PayloadSize)
bytesToWrite <span class="operator">-</span><span class="operator">=</span> tcpClient<span class="operator">.</span>write(<span class="type"><a href="../qtcore/qbytearray.html">QByteArray</a></span>(<a href="../qtcore/qtglobal.html#qMin">qMin</a>(bytesToWrite<span class="operator">,</span> PayloadSize)<span class="operator">,</span> <span class="char">'@'</span>));
clientProgressBar<span class="operator">-</span><span class="operator">></span>setMaximum(TotalBytes);
clientProgressBar<span class="operator">-</span><span class="operator">></span>setValue(bytesWritten);
clientStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Sent %1MB"</span>)<span class="operator">.</span>arg(bytesWritten <span class="operator">/</span> (<span class="number">1024</span> <span class="operator">*</span> <span class="number">1024</span>)));
}
<span class="type">void</span> Dialog<span class="operator">::</span>displayError(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError socketError)
{
<span class="keyword">if</span> (socketError <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span><span class="operator">::</span>RemoteHostClosedError)
<span class="keyword">return</span>;
<span class="type">QMessageBox</span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">"Network error"</span>)<span class="operator">,</span>
tr(<span class="string">"The following error occurred: %1."</span>)
<span class="operator">.</span>arg(tcpClient<span class="operator">.</span>errorString()));
tcpClient<span class="operator">.</span>close();
tcpServer<span class="operator">.</span>close();
clientProgressBar<span class="operator">-</span><span class="operator">></span>reset();
serverProgressBar<span class="operator">-</span><span class="operator">></span>reset();
clientStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Client ready"</span>));
serverStatusLabel<span class="operator">-</span><span class="operator">></span>setText(tr(<span class="string">"Server ready"</span>));
startButton<span class="operator">-</span><span class="operator">></span>setEnabled(<span class="keyword">true</span>);
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type">QApplication</span><span class="operator">::</span>restoreOverrideCursor();
<span class="preprocessor">#endif</span>
}
</pre>
</div>
<!-- @@@loopback/dialog.cpp -->
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distrib
>
Mageia
>
7
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armv7hl
>
media
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core-updates
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by-pkgid
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d5e62c01ae8d1e579463c6a871dd44bf
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