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<h1 class="title">dialog.cpp Example File</h1>
<span class="small-subtitle">network/loopback/dialog.cpp</span>
<!-- $$$network/loopback/dialog.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** You may use this file under the terms of the BSD license as follows:
**
** &quot;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
** &quot;AS IS&quot; 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,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.&quot;
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include &lt;QtGui&gt;</span>
<span class="preprocessor">#include &lt;QtNetwork&gt;</span>
<span class="preprocessor">#include &quot;dialog.h&quot;</span>
<span class="preprocessor">#if !defined(Q_OS_WINCE) &amp;&amp; !defined(Q_OS_SYMBIAN)</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="preprocessor">#else</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> TotalBytes <span class="operator">=</span> <span class="number">5</span> <span class="operator">*</span> <span class="number">1024</span> <span class="operator">*</span> <span class="number">1024</span>;
<span class="preprocessor">#endif</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"><a href="qwidget.html">QWidget</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qdialog.html">QDialog</a></span>(parent)
{
clientProgressBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprogressbar.html">QProgressBar</a></span>;
clientStatusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Client ready&quot;</span>));
serverProgressBar <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qprogressbar.html">QProgressBar</a></span>;
serverStatusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;Server ready&quot;</span>));
<span class="preprocessor">#ifdef Q_OS_SYMBIAN</span>
<span class="type"><a href="qmenu.html">QMenu</a></span> <span class="operator">*</span>menu <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qmenu.html">QMenu</a></span>(<span class="keyword">this</span>);
<span class="type"><a href="qaction.html">QAction</a></span> <span class="operator">*</span>optionsAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Options&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
optionsAction<span class="operator">-</span><span class="operator">&gt;</span>setSoftKeyRole(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>PositiveSoftKey);
optionsAction<span class="operator">-</span><span class="operator">&gt;</span>setMenu(menu);
addAction(optionsAction);
startAction <span class="operator">=</span> menu<span class="operator">-</span><span class="operator">&gt;</span>addAction(tr(<span class="string">&quot;Start&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(start()));
quitAction <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qaction.html">QAction</a></span>(tr(<span class="string">&quot;Exit&quot;</span>)<span class="operator">,</span> <span class="keyword">this</span>);
quitAction<span class="operator">-</span><span class="operator">&gt;</span>setSoftKeyRole(<span class="type"><a href="qaction.html">QAction</a></span><span class="operator">::</span>NegativeSoftKey);
addAction(quitAction);
connect(quitAction<span class="operator">,</span> SIGNAL(triggered())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
<span class="preprocessor">#else</span>
startButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;&amp;Start&quot;</span>));
quitButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;&amp;Quit&quot;</span>));
buttonBox <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span>;
buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(startButton<span class="operator">,</span> <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>ActionRole);
buttonBox<span class="operator">-</span><span class="operator">&gt;</span>addButton(quitButton<span class="operator">,</span> <span class="type"><a href="qdialogbuttonbox.html">QDialogButtonBox</a></span><span class="operator">::</span>RejectRole);
connect(startButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(start()));
connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
<span class="preprocessor">#endif</span>
connect(<span class="operator">&amp;</span>tcpServer<span class="operator">,</span> SIGNAL(newConnection())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(acceptConnection()));
connect(<span class="operator">&amp;</span>tcpClient<span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(startTransfer()));
connect(<span class="operator">&amp;</span>tcpClient<span class="operator">,</span> SIGNAL(bytesWritten(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateClientProgress(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>)));
connect(<span class="operator">&amp;</span>tcpClient<span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(displayError(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError)));
<span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qvboxlayout.html">QVBoxLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(clientProgressBar);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(clientStatusLabel);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(serverProgressBar);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(serverStatusLabel);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addStretch(<span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addSpacing(<span class="number">10</span>);
<span class="preprocessor">#ifndef Q_OS_SYMBIAN</span>
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(buttonBox);
<span class="preprocessor">#endif</span>
setLayout(mainLayout);
setWindowTitle(tr(<span class="string">&quot;Loopback&quot;</span>));
}
<span class="type">void</span> Dialog<span class="operator">::</span>start()
{
<span class="preprocessor">#ifdef Q_OS_SYMBIAN</span>
startAction<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">false</span>);
<span class="preprocessor">#else</span>
startButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
<span class="preprocessor">#endif</span>
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>setOverrideCursor(<span class="type"><a href="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">&amp;</span><span class="operator">&amp;</span> <span class="operator">!</span>tcpServer<span class="operator">.</span>listen()) {
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>StandardButton ret <span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>critical(<span class="keyword">this</span><span class="operator">,</span>
tr(<span class="string">&quot;Loopback&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;Unable to start the test: %1.&quot;</span>)
<span class="operator">.</span>arg(tcpServer<span class="operator">.</span>errorString())<span class="operator">,</span>
<span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Retry
<span class="operator">|</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel);
<span class="keyword">if</span> (ret <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>Cancel)
<span class="keyword">return</span>;
}
serverStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Listening&quot;</span>));
clientStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Connecting&quot;</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();
connect(tcpServerConnection<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(updateServerProgress()));
connect(tcpServerConnection<span class="operator">,</span> SIGNAL(error(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(displayError(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError)));
serverStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Accepted connection&quot;</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="qbytearray.html">QByteArray</a></span>(PayloadSize<span class="operator">,</span> <span class="char">'@'</span>));
clientStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Connected&quot;</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">&gt;</span>bytesAvailable();
tcpServerConnection<span class="operator">-</span><span class="operator">&gt;</span>readAll();
serverProgressBar<span class="operator">-</span><span class="operator">&gt;</span>setMaximum(TotalBytes);
serverProgressBar<span class="operator">-</span><span class="operator">&gt;</span>setValue(bytesReceived);
serverStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Received %1MB&quot;</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">&gt;</span>close();
<span class="preprocessor">#ifdef Q_OS_SYMBIAN</span>
startAction<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">true</span>);
<span class="preprocessor">#else</span>
startButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
<span class="preprocessor">#endif</span>
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type"><a href="qapplication.html">QApplication</a></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="qtglobal.html#qint64-typedef">qint64</a></span> numBytes)
{
<span class="comment">// callen 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">&gt;</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> tcpClient<span class="operator">.</span>bytesToWrite() <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">4</span><span class="operator">*</span>PayloadSize)
bytesToWrite <span class="operator">-</span><span class="operator">=</span> (<span class="type">int</span>)tcpClient<span class="operator">.</span>write(<span class="type"><a href="qbytearray.html">QByteArray</a></span>(<a href="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">&gt;</span>setMaximum(TotalBytes);
clientProgressBar<span class="operator">-</span><span class="operator">&gt;</span>setValue(bytesWritten);
clientStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Sent %1MB&quot;</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"><a href="qmessagebox.html">QMessageBox</a></span><span class="operator">::</span>information(<span class="keyword">this</span><span class="operator">,</span> tr(<span class="string">&quot;Network error&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The following error occurred: %1.&quot;</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">&gt;</span>reset();
serverProgressBar<span class="operator">-</span><span class="operator">&gt;</span>reset();
clientStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Client ready&quot;</span>));
serverStatusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Server ready&quot;</span>));
<span class="preprocessor">#ifdef Q_OS_SYMBIAN</span>
startAction<span class="operator">-</span><span class="operator">&gt;</span>setVisible(<span class="keyword">true</span>);
<span class="preprocessor">#else</span>
startButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
<span class="preprocessor">#endif</span>
<span class="preprocessor">#ifndef QT_NO_CURSOR</span>
<span class="type"><a href="qapplication.html">QApplication</a></span><span class="operator">::</span>restoreOverrideCursor();
<span class="preprocessor">#endif</span>
}</pre>
</div>
<!-- @@@network/loopback/dialog.cpp -->
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