375 lines
22 KiB
HTML
375 lines
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<h1 class="title">downloadmanager.cpp Example File</h1>
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<span class="small-subtitle">network/downloadmanager/downloadmanager.cpp</span>
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<!-- $$$network/downloadmanager/downloadmanager.cpp-description -->
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<div class="descr"> <a name="details"></a>
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<pre class="cpp"> <span class="comment">/****************************************************************************
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**
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** Copyright (C) 2015 The Qt Company Ltd.
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** Contact: http://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:BSD$
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** You may use this file under the terms of the BSD license as follows:
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**
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** "Redistribution and use in source and binary forms, with or without
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** modification, are permitted provided that the following conditions are
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** met:
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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in
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** the documentation and/or other materials provided with the
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** distribution.
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** * Neither the name of The Qt Company Ltd nor the names of its
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** contributors may be used to endorse or promote products derived
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** from this software without specific prior written permission.
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**
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**
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** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/</span>
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<span class="preprocessor">#include "downloadmanager.h"</span>
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<span class="preprocessor">#include <QFileInfo></span>
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<span class="preprocessor">#include <QNetworkRequest></span>
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<span class="preprocessor">#include <QNetworkReply></span>
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<span class="preprocessor">#include <QString></span>
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<span class="preprocessor">#include <QStringList></span>
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<span class="preprocessor">#include <QTimer></span>
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<span class="preprocessor">#include <stdio.h></span>
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DownloadManager<span class="operator">::</span>DownloadManager(<span class="type"><a href="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
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: <span class="type"><a href="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>)
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{
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}
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<span class="type">void</span> DownloadManager<span class="operator">::</span>append(<span class="keyword">const</span> <span class="type"><a href="qstringlist.html">QStringList</a></span> <span class="operator">&</span>urlList)
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{
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foreach (<span class="type"><a href="qstring.html">QString</a></span> url<span class="operator">,</span> urlList)
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append(<span class="type"><a href="qurl.html">QUrl</a></span><span class="operator">::</span>fromEncoded(url<span class="operator">.</span>toLocal8Bit()));
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<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty())
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<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> SIGNAL(finished()));
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}
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<span class="type">void</span> DownloadManager<span class="operator">::</span>append(<span class="keyword">const</span> <span class="type"><a href="qurl.html">QUrl</a></span> <span class="operator">&</span>url)
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{
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<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty())
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<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(startNextDownload()));
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downloadQueue<span class="operator">.</span>enqueue(url);
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<span class="operator">+</span><span class="operator">+</span>totalCount;
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}
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<span class="type"><a href="qstring.html">QString</a></span> DownloadManager<span class="operator">::</span>saveFileName(<span class="keyword">const</span> <span class="type"><a href="qurl.html">QUrl</a></span> <span class="operator">&</span>url)
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{
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<span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> url<span class="operator">.</span>path();
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<span class="type"><a href="qstring.html">QString</a></span> basename <span class="operator">=</span> <span class="type"><a href="qfileinfo.html">QFileInfo</a></span>(path)<span class="operator">.</span>fileName();
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<span class="keyword">if</span> (basename<span class="operator">.</span>isEmpty())
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basename <span class="operator">=</span> <span class="string">"download"</span>;
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<span class="keyword">if</span> (<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>exists(basename)) {
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<span class="comment">// already exists, don't overwrite</span>
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<span class="type">int</span> i <span class="operator">=</span> <span class="number">0</span>;
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basename <span class="operator">+</span><span class="operator">=</span> <span class="char">'.'</span>;
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<span class="keyword">while</span> (<span class="type"><a href="qfile.html">QFile</a></span><span class="operator">::</span>exists(basename <span class="operator">+</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(i)))
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<span class="operator">+</span><span class="operator">+</span>i;
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basename <span class="operator">+</span><span class="operator">=</span> <span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>number(i);
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}
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<span class="keyword">return</span> basename;
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}
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<span class="type">void</span> DownloadManager<span class="operator">::</span>startNextDownload()
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{
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<span class="keyword">if</span> (downloadQueue<span class="operator">.</span>isEmpty()) {
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printf(<span class="string">"%d/%d files downloaded successfully\n"</span><span class="operator">,</span> downloadedCount<span class="operator">,</span> totalCount);
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<span class="keyword">emit</span> finished();
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<span class="keyword">return</span>;
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}
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<span class="type"><a href="qurl.html">QUrl</a></span> url <span class="operator">=</span> downloadQueue<span class="operator">.</span>dequeue();
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<span class="type"><a href="qstring.html">QString</a></span> filename <span class="operator">=</span> saveFileName(url);
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output<span class="operator">.</span>setFileName(filename);
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<span class="keyword">if</span> (<span class="operator">!</span>output<span class="operator">.</span>open(<span class="type"><a href="qiodevice.html">QIODevice</a></span><span class="operator">::</span>WriteOnly)) {
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fprintf(stderr<span class="operator">,</span> <span class="string">"Problem opening save file '%s' for download '%s': %s\n"</span><span class="operator">,</span>
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<a href="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>
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<a href="qtglobal.html#qPrintable">qPrintable</a>(output<span class="operator">.</span>errorString()));
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startNextDownload();
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<span class="keyword">return</span>; <span class="comment">// skip this download</span>
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}
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<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span> request(url);
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currentDownload <span class="operator">=</span> manager<span class="operator">.</span>get(request);
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connect(currentDownload<span class="operator">,</span> SIGNAL(downloadProgress(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">,</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>))<span class="operator">,</span>
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SLOT(downloadProgress(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span><span class="operator">,</span><span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span>)));
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connect(currentDownload<span class="operator">,</span> SIGNAL(finished())<span class="operator">,</span>
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SLOT(downloadFinished()));
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connect(currentDownload<span class="operator">,</span> SIGNAL(readyRead())<span class="operator">,</span>
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SLOT(downloadReadyRead()));
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<span class="comment">// prepare the output</span>
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printf(<span class="string">"Downloading %s...\n"</span><span class="operator">,</span> url<span class="operator">.</span>toEncoded()<span class="operator">.</span>constData());
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downloadTime<span class="operator">.</span>start();
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}
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<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadProgress(<span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytesReceived<span class="operator">,</span> <span class="type"><a href="qtglobal.html#qint64-typedef">qint64</a></span> bytesTotal)
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{
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progressBar<span class="operator">.</span>setStatus(bytesReceived<span class="operator">,</span> bytesTotal);
|
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<span class="comment">// calculate the download speed</span>
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|
<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();
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|
<span class="type"><a href="qstring.html">QString</a></span> unit;
|
|
<span class="keyword">if</span> (speed <span class="operator"><</span> <span class="number">1024</span>) {
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unit <span class="operator">=</span> <span class="string">"bytes/sec"</span>;
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} <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>) {
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speed <span class="operator">/</span><span class="operator">=</span> <span class="number">1024</span>;
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unit <span class="operator">=</span> <span class="string">"kB/s"</span>;
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} <span class="keyword">else</span> {
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speed <span class="operator">/</span><span class="operator">=</span> <span class="number">1024</span><span class="operator">*</span><span class="number">1024</span>;
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unit <span class="operator">=</span> <span class="string">"MB/s"</span>;
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}
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progressBar<span class="operator">.</span>setMessage(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">"%1 %2"</span>)
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|
<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));
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|
progressBar<span class="operator">.</span>update();
|
|
}
|
|
|
|
<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadFinished()
|
|
{
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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="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>
|
|
</div>
|
|
<!-- @@@network/downloadmanager/downloadmanager.cpp -->
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The documentation provided herein is licensed under the terms of the
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Documentation sources may be obtained from <a href="http://www.qt-project.org">
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