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<h1 class="title">connection.cpp Example File</h1>
<span class="small-subtitle">network/network-chat/connection.cpp</span>
<!-- $$$network/network-chat/connection.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 &quot;connection.h&quot;</span>
<span class="preprocessor">#include &lt;QtNetwork&gt;</span>
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> TransferTimeout <span class="operator">=</span> <span class="number">30</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> PongTimeout <span class="operator">=</span> <span class="number">60</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">int</span> PingInterval <span class="operator">=</span> <span class="number">5</span> <span class="operator">*</span> <span class="number">1000</span>;
<span class="keyword">static</span> <span class="keyword">const</span> <span class="type">char</span> SeparatorToken <span class="operator">=</span> <span class="char">' '</span>;
Connection<span class="operator">::</span>Connection(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="qtcpsocket.html">QTcpSocket</a></span>(parent)
{
greetingMessage <span class="operator">=</span> tr(<span class="string">&quot;undefined&quot;</span>);
username <span class="operator">=</span> tr(<span class="string">&quot;unknown&quot;</span>);
state <span class="operator">=</span> WaitingForGreeting;
currentDataType <span class="operator">=</span> Undefined;
numBytesForCurrentDataType <span class="operator">=</span> <span class="operator">-</span><span class="number">1</span>;
transferTimerId <span class="operator">=</span> <span class="number">0</span>;
isGreetingMessageSent <span class="operator">=</span> <span class="keyword">false</span>;
pingTimer<span class="operator">.</span>setInterval(PingInterval);
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(processReadyRead()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(disconnected())<span class="operator">,</span> <span class="operator">&amp;</span>pingTimer<span class="operator">,</span> SLOT(stop()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(<span class="operator">&amp;</span>pingTimer<span class="operator">,</span> SIGNAL(timeout())<span class="operator">,</span> <span class="keyword">this</span><span class="operator">,</span> SLOT(sendPing()));
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>connect(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(connected())<span class="operator">,</span>
<span class="keyword">this</span><span class="operator">,</span> SLOT(sendGreetingMessage()));
}
<span class="type"><a href="qstring.html">QString</a></span> Connection<span class="operator">::</span>name() <span class="keyword">const</span>
{
<span class="keyword">return</span> username;
}
<span class="type">void</span> Connection<span class="operator">::</span>setGreetingMessage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>message)
{
greetingMessage <span class="operator">=</span> message;
}
<span class="type">bool</span> Connection<span class="operator">::</span>sendMessage(<span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>message)
{
<span class="keyword">if</span> (message<span class="operator">.</span>isEmpty())
<span class="keyword">return</span> <span class="keyword">false</span>;
<span class="type"><a href="qbytearray.html">QByteArray</a></span> msg <span class="operator">=</span> message<span class="operator">.</span>toUtf8();
<span class="type"><a href="qbytearray.html">QByteArray</a></span> data <span class="operator">=</span> <span class="string">&quot;MESSAGE &quot;</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(msg<span class="operator">.</span>size()) <span class="operator">+</span> <span class="char">' '</span> <span class="operator">+</span> msg;
<span class="keyword">return</span> write(data) <span class="operator">=</span><span class="operator">=</span> data<span class="operator">.</span>size();
}
<span class="type">void</span> Connection<span class="operator">::</span>timerEvent(<span class="type"><a href="qtimerevent.html">QTimerEvent</a></span> <span class="operator">*</span>timerEvent)
{
<span class="keyword">if</span> (timerEvent<span class="operator">-</span><span class="operator">&gt;</span>timerId() <span class="operator">=</span><span class="operator">=</span> transferTimerId) {
abort();
killTimer(transferTimerId);
transferTimerId <span class="operator">=</span> <span class="number">0</span>;
}
}
<span class="type">void</span> Connection<span class="operator">::</span>processReadyRead()
{
<span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> WaitingForGreeting) {
<span class="keyword">if</span> (<span class="operator">!</span>readProtocolHeader())
<span class="keyword">return</span>;
<span class="keyword">if</span> (currentDataType <span class="operator">!</span><span class="operator">=</span> Greeting) {
abort();
<span class="keyword">return</span>;
}
state <span class="operator">=</span> ReadingGreeting;
}
<span class="keyword">if</span> (state <span class="operator">=</span><span class="operator">=</span> ReadingGreeting) {
<span class="keyword">if</span> (<span class="operator">!</span>hasEnoughData())
<span class="keyword">return</span>;
buffer <span class="operator">=</span> read(numBytesForCurrentDataType);
<span class="keyword">if</span> (buffer<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> numBytesForCurrentDataType) {
abort();
<span class="keyword">return</span>;
}
username <span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span>(buffer) <span class="operator">+</span> <span class="char">'@'</span> <span class="operator">+</span> peerAddress()<span class="operator">.</span>toString() <span class="operator">+</span> <span class="char">':'</span>
<span class="operator">+</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(peerPort());
currentDataType <span class="operator">=</span> Undefined;
numBytesForCurrentDataType <span class="operator">=</span> <span class="number">0</span>;
buffer<span class="operator">.</span>clear();
<span class="keyword">if</span> (<span class="operator">!</span>isValid()) {
abort();
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (<span class="operator">!</span>isGreetingMessageSent)
sendGreetingMessage();
pingTimer<span class="operator">.</span>start();
pongTime<span class="operator">.</span>start();
state <span class="operator">=</span> ReadyForUse;
<span class="keyword">emit</span> readyForUse();
}
<span class="keyword">do</span> {
<span class="keyword">if</span> (currentDataType <span class="operator">=</span><span class="operator">=</span> Undefined) {
<span class="keyword">if</span> (<span class="operator">!</span>readProtocolHeader())
<span class="keyword">return</span>;
}
<span class="keyword">if</span> (<span class="operator">!</span>hasEnoughData())
<span class="keyword">return</span>;
processData();
} <span class="keyword">while</span> (bytesAvailable() <span class="operator">&gt;</span> <span class="number">0</span>);
}
<span class="type">void</span> Connection<span class="operator">::</span>sendPing()
{
<span class="keyword">if</span> (pongTime<span class="operator">.</span>elapsed() <span class="operator">&gt;</span> PongTimeout) {
abort();
<span class="keyword">return</span>;
}
write(<span class="string">&quot;PING 1 p&quot;</span>);
}
<span class="type">void</span> Connection<span class="operator">::</span>sendGreetingMessage()
{
<span class="type"><a href="qbytearray.html">QByteArray</a></span> greeting <span class="operator">=</span> greetingMessage<span class="operator">.</span>toUtf8();
<span class="type"><a href="qbytearray.html">QByteArray</a></span> data <span class="operator">=</span> <span class="string">&quot;GREETING &quot;</span> <span class="operator">+</span> <span class="type"><a href="qbytearray.html">QByteArray</a></span><span class="operator">::</span>number(greeting<span class="operator">.</span>size()) <span class="operator">+</span> <span class="char">' '</span> <span class="operator">+</span> greeting;
<span class="keyword">if</span> (write(data) <span class="operator">=</span><span class="operator">=</span> data<span class="operator">.</span>size())
isGreetingMessageSent <span class="operator">=</span> <span class="keyword">true</span>;
}
<span class="type">int</span> Connection<span class="operator">::</span>readDataIntoBuffer(<span class="type">int</span> maxSize)
{
<span class="keyword">if</span> (maxSize <span class="operator">&gt;</span> MaxBufferSize)
<span class="keyword">return</span> <span class="number">0</span>;
<span class="type">int</span> numBytesBeforeRead <span class="operator">=</span> buffer<span class="operator">.</span>size();
<span class="keyword">if</span> (numBytesBeforeRead <span class="operator">=</span><span class="operator">=</span> MaxBufferSize) {
abort();
<span class="keyword">return</span> <span class="number">0</span>;
}
<span class="keyword">while</span> (bytesAvailable() <span class="operator">&gt;</span> <span class="number">0</span> <span class="operator">&amp;</span><span class="operator">&amp;</span> buffer<span class="operator">.</span>size() <span class="operator">&lt;</span> maxSize) {
buffer<span class="operator">.</span>append(read(<span class="number">1</span>));
<span class="keyword">if</span> (buffer<span class="operator">.</span>endsWith(SeparatorToken))
<span class="keyword">break</span>;
}
<span class="keyword">return</span> buffer<span class="operator">.</span>size() <span class="operator">-</span> numBytesBeforeRead;
}
<span class="type">int</span> Connection<span class="operator">::</span>dataLengthForCurrentDataType()
{
<span class="keyword">if</span> (bytesAvailable() <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> readDataIntoBuffer() <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>
<span class="operator">|</span><span class="operator">|</span> <span class="operator">!</span>buffer<span class="operator">.</span>endsWith(SeparatorToken))
<span class="keyword">return</span> <span class="number">0</span>;
buffer<span class="operator">.</span>chop(<span class="number">1</span>);
<span class="type">int</span> number <span class="operator">=</span> buffer<span class="operator">.</span>toInt();
buffer<span class="operator">.</span>clear();
<span class="keyword">return</span> number;
}
<span class="type">bool</span> Connection<span class="operator">::</span>readProtocolHeader()
{
<span class="keyword">if</span> (transferTimerId) {
killTimer(transferTimerId);
transferTimerId <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">if</span> (readDataIntoBuffer() <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>) {
transferTimerId <span class="operator">=</span> startTimer(TransferTimeout);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="keyword">if</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;PING &quot;</span>) {
currentDataType <span class="operator">=</span> Ping;
} <span class="keyword">else</span> <span class="keyword">if</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;PONG &quot;</span>) {
currentDataType <span class="operator">=</span> Pong;
} <span class="keyword">else</span> <span class="keyword">if</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;MESSAGE &quot;</span>) {
currentDataType <span class="operator">=</span> PlainText;
} <span class="keyword">else</span> <span class="keyword">if</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="string">&quot;GREETING &quot;</span>) {
currentDataType <span class="operator">=</span> Greeting;
} <span class="keyword">else</span> {
currentDataType <span class="operator">=</span> Undefined;
abort();
<span class="keyword">return</span> <span class="keyword">false</span>;
}
buffer<span class="operator">.</span>clear();
numBytesForCurrentDataType <span class="operator">=</span> dataLengthForCurrentDataType();
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">bool</span> Connection<span class="operator">::</span>hasEnoughData()
{
<span class="keyword">if</span> (transferTimerId) {
<span class="type"><a href="qobject.html">QObject</a></span><span class="operator">::</span>killTimer(transferTimerId);
transferTimerId <span class="operator">=</span> <span class="number">0</span>;
}
<span class="keyword">if</span> (numBytesForCurrentDataType <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>)
numBytesForCurrentDataType <span class="operator">=</span> dataLengthForCurrentDataType();
<span class="keyword">if</span> (bytesAvailable() <span class="operator">&lt;</span> numBytesForCurrentDataType
<span class="operator">|</span><span class="operator">|</span> numBytesForCurrentDataType <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">0</span>) {
transferTimerId <span class="operator">=</span> startTimer(TransferTimeout);
<span class="keyword">return</span> <span class="keyword">false</span>;
}
<span class="keyword">return</span> <span class="keyword">true</span>;
}
<span class="type">void</span> Connection<span class="operator">::</span>processData()
{
buffer <span class="operator">=</span> read(numBytesForCurrentDataType);
<span class="keyword">if</span> (buffer<span class="operator">.</span>size() <span class="operator">!</span><span class="operator">=</span> numBytesForCurrentDataType) {
abort();
<span class="keyword">return</span>;
}
<span class="keyword">switch</span> (currentDataType) {
<span class="keyword">case</span> PlainText:
<span class="keyword">emit</span> newMessage(username<span class="operator">,</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromUtf8(buffer));
<span class="keyword">break</span>;
<span class="keyword">case</span> Ping:
write(<span class="string">&quot;PONG 1 p&quot;</span>);
<span class="keyword">break</span>;
<span class="keyword">case</span> Pong:
pongTime<span class="operator">.</span>restart();
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
currentDataType <span class="operator">=</span> Undefined;
numBytesForCurrentDataType <span class="operator">=</span> <span class="number">0</span>;
buffer<span class="operator">.</span>clear();
}</pre>
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<!-- @@@network/network-chat/connection.cpp -->
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