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<td >Qt 5.12</td><td ><a href="qtnetwork-index.html">Qt Network</a></td><td ><a href="qtnetwork-download-example.html">Network Download Example</a></td><td >main.cpp Example File</td></tr></table><table class="buildversion"><tr>
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<h1 class="title">main.cpp Example File</h1>
<span class="subtitle">download/main.cpp</span>
<!-- $$$download/main.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2017 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 <QtCore></span>
<span class="preprocessor">#include <QtNetwork></span>
<span class="preprocessor">#include <cstdio></span>
<span class="keyword">class</span> <span class="type"><a href="qsslerror.html">QSslError</a></span>;
<span class="keyword">using</span> <span class="keyword">namespace</span> std;
<span class="keyword">class</span> DownloadManager: <span class="keyword">public</span> <span class="type"><a href="../qtcore/qobject.html">QObject</a></span>
{
Q_OBJECT
<span class="type"><a href="qnetworkaccessmanager.html">QNetworkAccessManager</a></span> manager;
<span class="type"><a href="../qtcore/qvector.html">QVector</a></span><span class="operator"><</span><span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span><span class="operator">></span> currentDownloads;
<span class="keyword">public</span>:
DownloadManager();
<span class="type">void</span> doDownload(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> <span class="operator">&</span>url);
<span class="keyword">static</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> saveFileName(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> <span class="operator">&</span>url);
bool saveToDisk(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>filename<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span> <span class="operator">*</span>data);
<span class="keyword">static</span> bool isHttpRedirect(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply);
<span class="keyword">public</span> <span class="keyword">slots</span>:
<span class="type">void</span> execute();
<span class="type">void</span> downloadFinished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply);
<span class="type">void</span> sslErrors(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qsslerror.html">QSslError</a></span><span class="operator">></span> <span class="operator">&</span>errors);
};
DownloadManager<span class="operator">::</span>DownloadManager()
{
connect(<span class="operator">&</span>manager<span class="operator">,</span> SIGNAL(finished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>))<span class="operator">,</span>
SLOT(downloadFinished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span><span class="operator">*</span>)));
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>doDownload(<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="qnetworkrequest.html">QNetworkRequest</a></span> request(url);
<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply <span class="operator">=</span> manager<span class="operator">.</span>get(request);
<span class="preprocessor">#if QT_CONFIG(ssl)</span>
connect(reply<span class="operator">,</span> SIGNAL(sslErrors(<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qsslerror.html">QSslError</a></span><span class="operator">></span>))<span class="operator">,</span>
SLOT(sslErrors(<span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qsslerror.html">QSslError</a></span><span class="operator">></span>)));
<span class="preprocessor">#endif</span>
currentDownloads<span class="operator">.</span>append(reply);
}
<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;
}
bool DownloadManager<span class="operator">::</span>saveToDisk(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>filename<span class="operator">,</span> <span class="type"><a href="../qtcore/qiodevice.html">QIODevice</a></span> <span class="operator">*</span>data)
{
<span class="type"><a href="../qtcore/qfile.html">QFile</a></span> file(filename);
<span class="keyword">if</span> (<span class="operator">!</span>file<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">"Could not open %s for writing: %s\n"</span><span class="operator">,</span>
<a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(filename)<span class="operator">,</span>
<a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(file<span class="operator">.</span>errorString()));
<span class="keyword">return</span> <span class="keyword">false</span>;
}
file<span class="operator">.</span>write(data<span class="operator">-</span><span class="operator">></span>readAll());
file<span class="operator">.</span>close();
<span class="keyword">return</span> <span class="keyword">true</span>;
}
bool DownloadManager<span class="operator">::</span>isHttpRedirect(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply)
{
<span class="type">int</span> statusCode <span class="operator">=</span> reply<span class="operator">-</span><span class="operator">></span>attribute(<span class="type"><a href="qnetworkrequest.html">QNetworkRequest</a></span><span class="operator">::</span>HttpStatusCodeAttribute)<span class="operator">.</span>toInt();
<span class="keyword">return</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">301</span> <span class="operator">|</span><span class="operator">|</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">302</span> <span class="operator">|</span><span class="operator">|</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">303</span>
<span class="operator">|</span><span class="operator">|</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">305</span> <span class="operator">|</span><span class="operator">|</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">307</span> <span class="operator">|</span><span class="operator">|</span> statusCode <span class="operator">=</span><span class="operator">=</span> <span class="number">308</span>;
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>execute()
{
<span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span> args <span class="operator">=</span> <span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">></span>arguments();
args<span class="operator">.</span>takeFirst(); <span class="comment">// skip the first argument, which is the program's name</span>
<span class="keyword">if</span> (args<span class="operator">.</span>isEmpty()) {
printf(<span class="string">"Qt Download example - downloads all URLs in parallel\n"</span>
<span class="string">"Usage: download url1 [url2... urlN]\n"</span>
<span class="string">"\n"</span>
<span class="string">"Downloads the URLs passed in the command-line to the local directory\n"</span>
<span class="string">"If the target file already exists, a .0, .1, .2, etc. is appended to\n"</span>
<span class="string">"differentiate.\n"</span>);
<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">></span>quit();
<span class="keyword">return</span>;
}
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span> <span class="operator">&</span>arg : <a href="../qtcore/qtglobal.html#qAsConst">qAsConst</a>(args)) {
<span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> url <span class="operator">=</span> <span class="type"><a href="../qtcore/qurl.html">QUrl</a></span><span class="operator">::</span>fromEncoded(arg<span class="operator">.</span>toLocal8Bit());
doDownload(url);
}
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>sslErrors(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qlist.html">QList</a></span><span class="operator"><</span><span class="type"><a href="qsslerror.html">QSslError</a></span><span class="operator">></span> <span class="operator">&</span>sslErrors)
{
<span class="preprocessor">#if QT_CONFIG(ssl)</span>
<span class="keyword">for</span> (<span class="keyword">const</span> <span class="type"><a href="qsslerror.html">QSslError</a></span> <span class="operator">&</span>error : sslErrors)
fprintf(stderr<span class="operator">,</span> <span class="string">"SSL error: %s\n"</span><span class="operator">,</span> <a href="../qtcore/qtglobal.html#qPrintable">qPrintable</a>(error<span class="operator">.</span>errorString()));
<span class="preprocessor">#else</span>
Q_UNUSED(sslErrors);
<span class="preprocessor">#endif</span>
}
<span class="type">void</span> DownloadManager<span class="operator">::</span>downloadFinished(<span class="type"><a href="qnetworkreply.html">QNetworkReply</a></span> <span class="operator">*</span>reply)
{
<span class="type"><a href="../qtcore/qurl.html">QUrl</a></span> url <span class="operator">=</span> reply<span class="operator">-</span><span class="operator">></span>url();
<span class="keyword">if</span> (reply<span class="operator">-</span><span class="operator">></span>error()) {
fprintf(stderr<span class="operator">,</span> <span class="string">"Download of %s failed: %s\n"</span><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>(reply<span class="operator">-</span><span class="operator">></span>errorString()));
} <span class="keyword">else</span> {
<span class="keyword">if</span> (isHttpRedirect(reply)) {
fputs(<span class="string">"Request was redirected.\n"</span><span class="operator">,</span> stderr);
} <span class="keyword">else</span> {
<span class="type"><a href="../qtcore/qstring.html">QString</a></span> filename <span class="operator">=</span> saveFileName(url);
<span class="keyword">if</span> (saveToDisk(filename<span class="operator">,</span> reply)) {
printf(<span class="string">"Download of %s succeeded (saved to %s)\n"</span><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>(filename));
}
}
}
currentDownloads<span class="operator">.</span>removeAll(reply);
reply<span class="operator">-</span><span class="operator">></span>deleteLater();
<span class="keyword">if</span> (currentDownloads<span class="operator">.</span>isEmpty()) {
<span class="comment">// all downloads finished</span>
<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span><span class="operator">::</span>instance()<span class="operator">-</span><span class="operator">></span>quit();
}
}
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span><span class="operator">*</span>argv)
{
<span class="type"><a href="../qtcore/qcoreapplication.html">QCoreApplication</a></span> app(argc<span class="operator">,</span> argv);
DownloadManager manager;
<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="operator">&</span>manager<span class="operator">,</span> SLOT(execute()));
app<span class="operator">.</span>exec();
}
<span class="preprocessor">#include "main.moc"</span>
</pre>
</div>
<!-- @@@download/main.cpp -->
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Documentation contributions included herein are the copyrights of
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distrib
>
Mageia
>
7
>
armv7hl
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media
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core-updates
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by-pkgid
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d5e62c01ae8d1e579463c6a871dd44bf
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files
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2165
