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<h1 class="title">client.cpp Example File</h1>
<span class="small-subtitle">network/fortuneclient/client.cpp</span>
<!-- $$$network/fortuneclient/client.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;client.h&quot;</span>
Client<span class="operator">::</span>Client(<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)<span class="operator">,</span> networkSession(<span class="number">0</span>)
{
hostLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;&amp;Server name:&quot;</span>));
portLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;S&amp;erver port:&quot;</span>));
<span class="comment">// find out which IP to connect to</span>
<span class="type"><a href="qstring.html">QString</a></span> ipAddress;
<span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">&gt;</span> ipAddressesList <span class="operator">=</span> <span class="type"><a href="qnetworkinterface.html">QNetworkInterface</a></span><span class="operator">::</span>allAddresses();
<span class="comment">// use the first non-localhost IPv4 address</span>
<span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>; i <span class="operator">&lt;</span> ipAddressesList<span class="operator">.</span>size(); <span class="operator">+</span><span class="operator">+</span>i) {
<span class="keyword">if</span> (ipAddressesList<span class="operator">.</span>at(i) <span class="operator">!</span><span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost <span class="operator">&amp;</span><span class="operator">&amp;</span>
ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toIPv4Address()) {
ipAddress <span class="operator">=</span> ipAddressesList<span class="operator">.</span>at(i)<span class="operator">.</span>toString();
<span class="keyword">break</span>;
}
}
<span class="comment">// if we did not find one, use IPv4 localhost</span>
<span class="keyword">if</span> (ipAddress<span class="operator">.</span>isEmpty())
ipAddress <span class="operator">=</span> <span class="type"><a href="qhostaddress.html">QHostAddress</a></span>(<span class="type"><a href="qhostaddress.html">QHostAddress</a></span><span class="operator">::</span>LocalHost)<span class="operator">.</span>toString();
hostLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>(ipAddress);
portLineEdit <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlineedit.html">QLineEdit</a></span>;
portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setValidator(<span class="keyword">new</span> <span class="type"><a href="qintvalidator.html">QIntValidator</a></span>(<span class="number">1</span><span class="operator">,</span> <span class="number">65535</span><span class="operator">,</span> <span class="keyword">this</span>));
hostLabel<span class="operator">-</span><span class="operator">&gt;</span>setBuddy(hostLineEdit);
portLabel<span class="operator">-</span><span class="operator">&gt;</span>setBuddy(portLineEdit);
statusLabel <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qlabel.html">QLabel</a></span>(tr(<span class="string">&quot;This examples requires that you run the &quot;</span>
<span class="string">&quot;Fortune Server example as well.&quot;</span>));
getFortuneButton <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpushbutton.html">QPushButton</a></span>(tr(<span class="string">&quot;Get Fortune&quot;</span>));
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setDefault(<span class="keyword">true</span>);
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</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;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(getFortuneButton<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);
tcpSocket <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span>(<span class="keyword">this</span>);
connect(hostLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(enableGetFortuneButton()));
connect(portLineEdit<span class="operator">,</span> SIGNAL(textChanged(<span class="type"><a href="qstring.html">QString</a></span>))<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(enableGetFortuneButton()));
connect(getFortuneButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(requestNewFortune()));
connect(quitButton<span class="operator">,</span> SIGNAL(clicked())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(close()));
connect(tcpSocket<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(readFortune()));
connect(tcpSocket<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="qgridlayout.html">QGridLayout</a></span> <span class="operator">*</span>mainLayout <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgridlayout.html">QGridLayout</a></span>;
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(hostLabel<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">0</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(hostLineEdit<span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(portLabel<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">0</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(portLineEdit<span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">1</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(statusLabel<span class="operator">,</span> <span class="number">2</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
mainLayout<span class="operator">-</span><span class="operator">&gt;</span>addWidget(buttonBox<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="number">0</span><span class="operator">,</span> <span class="number">1</span><span class="operator">,</span> <span class="number">2</span>);
setLayout(mainLayout);
setWindowTitle(tr(<span class="string">&quot;Fortune Client&quot;</span>));
portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>setFocus();
<span class="type"><a href="qnetworkconfigurationmanager.html">QNetworkConfigurationManager</a></span> manager;
<span class="keyword">if</span> (manager<span class="operator">.</span>capabilities() <span class="operator">&amp;</span> <span class="type"><a href="qnetworkconfigurationmanager.html">QNetworkConfigurationManager</a></span><span class="operator">::</span>NetworkSessionRequired) {
<span class="comment">// Get saved network configuration</span>
<span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="type"><a href="qsettings.html">QSettings</a></span><span class="operator">::</span>UserScope<span class="operator">,</span> QLatin1String(<span class="string">&quot;Trolltech&quot;</span>));
settings<span class="operator">.</span>beginGroup(QLatin1String(<span class="string">&quot;QtNetwork&quot;</span>));
<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> id <span class="operator">=</span> settings<span class="operator">.</span>value(QLatin1String(<span class="string">&quot;DefaultNetworkConfiguration&quot;</span>))<span class="operator">.</span>toString();
settings<span class="operator">.</span>endGroup();
<span class="comment">// If the saved network configuration is not currently discovered use the system default</span>
<span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span> config <span class="operator">=</span> manager<span class="operator">.</span>configurationFromIdentifier(id);
<span class="keyword">if</span> ((config<span class="operator">.</span>state() <span class="operator">&amp;</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>Discovered) <span class="operator">!</span><span class="operator">=</span>
<span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>Discovered) {
config <span class="operator">=</span> manager<span class="operator">.</span>defaultConfiguration();
}
networkSession <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qnetworksession.html">QNetworkSession</a></span>(config<span class="operator">,</span> <span class="keyword">this</span>);
connect(networkSession<span class="operator">,</span> SIGNAL(opened())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sessionOpened()));
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
statusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;Opening network session.&quot;</span>));
networkSession<span class="operator">-</span><span class="operator">&gt;</span>open();
}
}
<span class="type">void</span> Client<span class="operator">::</span>requestNewFortune()
{
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">false</span>);
blockSize <span class="operator">=</span> <span class="number">0</span>;
tcpSocket<span class="operator">-</span><span class="operator">&gt;</span>abort();
tcpSocket<span class="operator">-</span><span class="operator">&gt;</span>connectToHost(hostLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">,</span>
portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>toInt());
}
<span class="type">void</span> Client<span class="operator">::</span>readFortune()
{
<span class="type"><a href="qdatastream.html">QDataStream</a></span> in(tcpSocket);
in<span class="operator">.</span>setVersion(<span class="type"><a href="qdatastream.html">QDataStream</a></span><span class="operator">::</span>Qt_4_0);
<span class="keyword">if</span> (blockSize <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>) {
<span class="keyword">if</span> (tcpSocket<span class="operator">-</span><span class="operator">&gt;</span>bytesAvailable() <span class="operator">&lt;</span> (<span class="type">int</span>)<span class="keyword">sizeof</span>(<span class="type"><a href="qtglobal.html#quint16-typedef">quint16</a></span>))
<span class="keyword">return</span>;
in <span class="operator">&gt;</span><span class="operator">&gt;</span> blockSize;
}
<span class="keyword">if</span> (tcpSocket<span class="operator">-</span><span class="operator">&gt;</span>bytesAvailable() <span class="operator">&lt;</span> blockSize)
<span class="keyword">return</span>;
<span class="type"><a href="qstring.html">QString</a></span> nextFortune;
in <span class="operator">&gt;</span><span class="operator">&gt;</span> nextFortune;
<span class="keyword">if</span> (nextFortune <span class="operator">=</span><span class="operator">=</span> currentFortune) {
<span class="type"><a href="qtimer.html">QTimer</a></span><span class="operator">::</span>singleShot(<span class="number">0</span><span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(requestNewFortune()));
<span class="keyword">return</span>;
}
currentFortune <span class="operator">=</span> nextFortune;
statusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(currentFortune);
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
}
<span class="type">void</span> Client<span class="operator">::</span>displayError(<span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>SocketError socketError)
{
<span class="keyword">switch</span> (socketError) {
<span class="keyword">case</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>RemoteHostClosedError:
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>HostNotFoundError:
<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;Fortune Client&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The host was not found. Please check the &quot;</span>
<span class="string">&quot;host name and port settings.&quot;</span>));
<span class="keyword">break</span>;
<span class="keyword">case</span> <span class="type"><a href="qabstractsocket.html">QAbstractSocket</a></span><span class="operator">::</span>ConnectionRefusedError:
<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;Fortune Client&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The connection was refused by the peer. &quot;</span>
<span class="string">&quot;Make sure the fortune server is running, &quot;</span>
<span class="string">&quot;and check that the host name and port &quot;</span>
<span class="string">&quot;settings are correct.&quot;</span>));
<span class="keyword">break</span>;
<span class="keyword">default</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;Fortune Client&quot;</span>)<span class="operator">,</span>
tr(<span class="string">&quot;The following error occurred: %1.&quot;</span>)
<span class="operator">.</span>arg(tcpSocket<span class="operator">-</span><span class="operator">&gt;</span>errorString()));
}
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled(<span class="keyword">true</span>);
}
<span class="type">void</span> Client<span class="operator">::</span>enableGetFortuneButton()
{
getFortuneButton<span class="operator">-</span><span class="operator">&gt;</span>setEnabled((<span class="operator">!</span>networkSession <span class="operator">|</span><span class="operator">|</span> networkSession<span class="operator">-</span><span class="operator">&gt;</span>isOpen()) <span class="operator">&amp;</span><span class="operator">&amp;</span>
<span class="operator">!</span>hostLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty() <span class="operator">&amp;</span><span class="operator">&amp;</span>
<span class="operator">!</span>portLineEdit<span class="operator">-</span><span class="operator">&gt;</span>text()<span class="operator">.</span>isEmpty());
}
<span class="type">void</span> Client<span class="operator">::</span>sessionOpened()
{
<span class="comment">// Save the used configuration</span>
<span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span> config <span class="operator">=</span> networkSession<span class="operator">-</span><span class="operator">&gt;</span>configuration();
<span class="type"><a href="qstring.html">QString</a></span> id;
<span class="keyword">if</span> (config<span class="operator">.</span>type() <span class="operator">=</span><span class="operator">=</span> <span class="type"><a href="qnetworkconfiguration.html">QNetworkConfiguration</a></span><span class="operator">::</span>UserChoice)
id <span class="operator">=</span> networkSession<span class="operator">-</span><span class="operator">&gt;</span>sessionProperty(QLatin1String(<span class="string">&quot;UserChoiceConfiguration&quot;</span>))<span class="operator">.</span>toString();
<span class="keyword">else</span>
id <span class="operator">=</span> config<span class="operator">.</span>identifier();
<span class="type"><a href="qsettings.html">QSettings</a></span> settings(<span class="type"><a href="qsettings.html">QSettings</a></span><span class="operator">::</span>UserScope<span class="operator">,</span> QLatin1String(<span class="string">&quot;Trolltech&quot;</span>));
settings<span class="operator">.</span>beginGroup(QLatin1String(<span class="string">&quot;QtNetwork&quot;</span>));
settings<span class="operator">.</span>setValue(QLatin1String(<span class="string">&quot;DefaultNetworkConfiguration&quot;</span>)<span class="operator">,</span> id);
settings<span class="operator">.</span>endGroup();
statusLabel<span class="operator">-</span><span class="operator">&gt;</span>setText(tr(<span class="string">&quot;This examples requires that you run the &quot;</span>
<span class="string">&quot;Fortune Server example as well.&quot;</span>));
enableGetFortuneButton();
}</pre>
</div>
<!-- @@@network/fortuneclient/client.cpp -->
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