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<td >Qt 5.9</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-downloadmanager-example.html">Network Download Manager Example</a></td><td >downloadmanager.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">downloadmanager.cpp Example File</h1>
<span class="subtitle">downloadmanager/downloadmanager.cpp</span>
<!-- $$$downloadmanager/downloadmanager.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,
** 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#include "downloadmanager.h"</span>
<span class="preprocessor">#include <QFileInfo></span>
<span class="preprocessor">#include <QNetworkRequest></span>
<span class="preprocessor">#include <QNetworkReply></span>
<span class="preprocessor">#include <QString></span>
<span class="preprocessor">#include <QStringList></span>
<span class="preprocessor">#include <QTimer></span>
<span class="preprocessor">#include <stdio.h></span>
DownloadManager<span class="operator">::</span>DownloadManager(<span class="type"><a href="../qtcore/qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>(parent)<span class="operator">,</span> downloadedCount(<span class="number">0</span>)<span class="operator">,</span> totalCount(<span class="number">0</span>)
{
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>append(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> <span class="operator">&</span>urlList)
{
foreach (<span class="type"><a href="../qtcore/qstring.html">QString</a></span> url<span class="operator">,</span> urlList)
append(<span class="type"><a href="../qtcore/qurl.html">QUrl</a></span><span class="operator">::</span>fromEncoded(url<span class="operator">.</span>toLocal8Bit()));
<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty())
<span class="type"><a href="../qtcore/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> SIGNAL(finished()));
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>append(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> <span class="operator">&</span>url)
{
<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty())
<span class="type"><a href="../qtcore/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(startNextDownload()));
downloadQueue<span class="operator">.</span>enqueue(url);
<span class="operator">+</span><span class="operator">+</span>totalCount;
}
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> DownloadManager<span class="operator">::</span>saveFileName(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> <span class="operator">&</span>url)
{
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> path <span class="operator">=</span> url<span class="operator">.</span>path();
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> basename <span class="operator">=</span> <span class="type"><a href="../qtcore/qfileinfo.html">QFileInfo</a></span>(path)<span class="operator">.</span>fileName();
<span class="keyword">if</span> (basename<span class="operator">.</span>isEmpty())
basename <span class="operator">=</span> <span class="string">"download"</span>;
<span class="keyword">if</span> (<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>exists(basename)) {
<span class="comment">// already exists, don't overwrite</span>
<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>;
basename <span class="operator">+</span><span class="operator">=</span> <span class="char">'.'</span>;
<span class="keyword">while</span> (<span class="type"><a href="../qtcore/qfile.html">QFile</a></span><span class="operator">::</span>exists(basename <span class="operator">+</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(i)))
<span class="operator">+</span><span class="operator">+</span>i;
basename <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>number(i);
}
<span class="keyword">return</span> basename;
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>startNextDownload()
{
<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty()) {
printf(<span class="string">"%d/%d files downloaded successfully\n"</span><span class="operator">,</span> downloadedCount<span class="operator">,</span> totalCount);
<span class="keyword">emit</span> finished();
<span class="keyword">return</span>;
}
<span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> url <span class="operator">=</span> downloadQueue<span class="operator">.</span>dequeue();
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> filename <span class="operator">=</span> saveFileName(url);
output<span class="operator">.</span>setFileName(filename);
<span class="keyword">if</span> (<span class="operator">!</span>output<span class="operator">.</span>open(<span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly)) {
fprintf(stderr<span class="operator">,</span> <span class="string">"Problem opening save file '%s' for download '%s': %s\n"</span><span class="operator">,</span>
<a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(filename)<span class="operator">,</span> url<span class="operator">.</span>toEncoded()<span class="operator">.</span>constData()<span class="operator">,</span>
<a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(output<span class="operator">.</span>errorString()));
startNextDownload();
<span class="keyword">return</span>; <span class="comment">// skip this download</span>
}
<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span> request(url);
currentDownload <span class="operator">=</span> manager<span class="operator">.</span>get(request);
connect(currentDownload<span class="operator">,</span> SIGNAL(downloadProgress(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span>))<span class="operator">,</span>
SLOT(downloadProgress(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">,</span><span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span>)));
connect(currentDownload<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span>
SLOT(downloadFinished()));
connect(currentDownload<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span>
SLOT(downloadReadyRead()));
<span class="comment">// prepare the output</span>
printf(<span class="string">"Downloading %s...\n"</span><span class="operator">,</span> url<span class="operator">.</span>toEncoded()<span class="operator">.</span>constData());
downloadTime<span class="operator">.</span>start();
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadProgress(<span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> bytesReceived<span class="operator">,</span> <span class="type"><a href="../qtcore/qtglobal.html#qint64-typedef">qint64</a></span> bytesTotal)
{
progressBar<span class="operator">.</span>setStatus(bytesReceived<span class="operator">,</span> bytesTotal);
<span class="comment">// calculate the download speed</span>
<span class="type">double</span> speed <span class="operator">=</span> bytesReceived <span class="operator">*</span> <span class="number">1000.0</span> <span class="operator">/</span> downloadTime<span class="operator">.</span>elapsed();
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> unit;
<span class="keyword">if</span> (speed <span class="operator"><</span> <span class="number">1024</span>) {
unit <span class="operator">=</span> <span class="string">"bytes/sec"</span>;
} <span class="keyword">else</span> <span class="keyword">if</span> (speed <span class="operator"><</span> <span class="number">1024</span><span class="operator">*</span><span class="number">1024</span>) {
speed <span class="operator">/</span><span class="operator">=</span> <span class="number">1024</span>;
unit <span class="operator">=</span> <span class="string">"kB/s"</span>;
} <span class="keyword">else</span> {
speed <span class="operator">/</span><span class="operator">=</span> <span class="number">1024</span><span class="operator">*</span><span class="number">1024</span>;
unit <span class="operator">=</span> <span class="string">"MB/s"</span>;
}
progressBar<span class="operator">.</span>setMessage(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">"%1 %2"</span>)
<span class="operator">.</span>arg(speed<span class="operator">,</span> <span class="number">3</span><span class="operator">,</span> <span class="char">'f'</span><span class="operator">,</span> <span class="number">1</span>)<span class="operator">.</span>arg(unit));
progressBar<span class="operator">.</span>update();
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadFinished()
{
progressBar<span class="operator">.</span>clear();
output<span class="operator">.</span>close();
<span class="keyword">if</span> (currentDownload<span class="operator">-</span><span class="operator">></span>error()) {
<span class="comment">// download failed</span>
fprintf(stderr<span class="operator">,</span> <span class="string">"Failed: %s\n"</span><span class="operator">,</span> <a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(currentDownload<span class="operator">-</span><span class="operator">></span>errorString()));
} <span class="keyword">else</span> {
printf(<span class="string">"Succeeded.\n"</span>);
<span class="operator">+</span><span class="operator">+</span>downloadedCount;
}
currentDownload<span class="operator">-</span><span class="operator">></span>deleteLater();
startNextDownload();
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadReadyRead()
{
output<span class="operator">.</span>write(currentDownload<span class="operator">-</span><span class="operator">></span>readAll());
}
</pre>
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<!-- @@@downloadmanager/downloadmanager.cpp -->
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