<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en_US" lang="en_US">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Qt 4.8: downloadmanager.cpp Example File (network/downloadmanager/downloadmanager.cpp)</title>
<link rel="stylesheet" type="text/css" href="style/style.css" />
<script src="scripts/jquery.js" type="text/javascript"></script>
<script src="scripts/functions.js" type="text/javascript"></script>
<link rel="stylesheet" type="text/css" href="style/superfish.css" />
<link rel="stylesheet" type="text/css" href="style/narrow.css" />
<!--[if IE]>
<meta name="MSSmartTagsPreventParsing" content="true">
<meta http-equiv="imagetoolbar" content="no">
<![endif]-->
<!--[if lt IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie6.css">
<![endif]-->
<!--[if IE 7]>
<link rel="stylesheet" type="text/css" href="style/style_ie7.css">
<![endif]-->
<!--[if IE 8]>
<link rel="stylesheet" type="text/css" href="style/style_ie8.css">
<![endif]-->
<script src="scripts/superfish.js" type="text/javascript"></script>
<script src="scripts/narrow.js" type="text/javascript"></script>
</head>
<body class="" onload="CheckEmptyAndLoadList();">
<div class="header" id="qtdocheader">
<div class="content">
<div id="nav-logo">
<a href="index.html">Home</a></div>
<a href="index.html" class="qtref"><span>Qt Reference Documentation</span></a>
<div id="narrowsearch"></div>
<div id="nav-topright">
<ul>
<li class="nav-topright-home"><a href="http://qt.digia.com/">Qt HOME</a></li>
<li class="nav-topright-dev"><a href="http://qt-project.org/">DEV</a></li>
<li class="nav-topright-doc nav-topright-doc-active"><a href="http://qt-project.org/doc/">
DOC</a></li>
<li class="nav-topright-blog"><a href="http://blog.qt.digia.com/">BLOG</a></li>
</ul>
</div>
<div id="shortCut">
<ul>
<li class="shortCut-topleft-inactive"><span><a href="index.html">Qt 4.8</a></span></li>
<li class="shortCut-topleft-active"><a href="http://qt-project.org/doc/">ALL VERSIONS </a></li>
</ul>
</div>
<ul class="sf-menu" id="narrowmenu">
<li><a href="#">API Lookup</a>
<ul>
<li><a href="classes.html">Class index</a></li>
<li><a href="functions.html">Function index</a></li>
<li><a href="modules.html">Modules</a></li>
<li><a href="namespaces.html">Namespaces</a></li>
<li><a href="qtglobal.html">Global Declarations</a></li>
<li><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</li>
<li><a href="#">Qt Topics</a>
<ul>
<li><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li><a href="supported-platforms.html">Supported Platforms</a></li>
<li><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</li>
<li><a href="#">Examples</a>
<ul>
<li><a href="all-examples.html">Examples</a></li>
<li><a href="tutorials.html">Tutorials</a></li>
<li><a href="demos.html">Demos</a></li>
<li><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</li>
</ul>
</div>
</div>
<div class="wrapper">
<div class="hd">
<span></span>
</div>
<div class="bd group">
<div class="sidebar">
<div class="searchlabel">
Search index:</div>
<div class="search" id="sidebarsearch">
<form id="qtdocsearch" action="" onsubmit="return false;">
<fieldset>
<input type="text" name="searchstring" id="pageType" value="" />
<div id="resultdialog">
<a href="#" id="resultclose">Close</a>
<p id="resultlinks" class="all"><a href="#" id="showallresults">All</a> | <a href="#" id="showapiresults">API</a> | <a href="#" id="showarticleresults">Articles</a> | <a href="#" id="showexampleresults">Examples</a></p>
<p id="searchcount" class="all"><span id="resultcount"></span><span id="apicount"></span><span id="articlecount"></span><span id="examplecount"></span> results:</p>
<ul id="resultlist" class="all">
</ul>
</div>
</fieldset>
</form>
</div>
<div class="box first bottombar" id="lookup">
<h2 title="API Lookup"><span></span>
API Lookup</h2>
<div id="list001" class="list">
<ul id="ul001" >
<li class="defaultLink"><a href="classes.html">Class index</a></li>
<li class="defaultLink"><a href="functions.html">Function index</a></li>
<li class="defaultLink"><a href="modules.html">Modules</a></li>
<li class="defaultLink"><a href="namespaces.html">Namespaces</a></li>
<li class="defaultLink"><a href="qtglobal.html">Global Declarations</a></li>
<li class="defaultLink"><a href="qdeclarativeelements.html">QML elements</a></li>
</ul>
</div>
</div>
<div class="box bottombar" id="topics">
<h2 title="Qt Topics"><span></span>
Qt Topics</h2>
<div id="list002" class="list">
<ul id="ul002" >
<li class="defaultLink"><a href="qt-basic-concepts.html">Programming with Qt</a></li>
<li class="defaultLink"><a href="qtquick.html">Device UIs & Qt Quick</a></li>
<li class="defaultLink"><a href="qt-gui-concepts.html">UI Design with Qt</a></li>
<li class="defaultLink"><a href="supported-platforms.html">Supported Platforms</a></li>
<li class="defaultLink"><a href="technology-apis.html">Qt and Key Technologies</a></li>
<li class="defaultLink"><a href="best-practices.html">How-To's and Best Practices</a></li>
</ul>
</div>
</div>
<div class="box" id="examples">
<h2 title="Examples"><span></span>
Examples</h2>
<div id="list003" class="list">
<ul id="ul003">
<li class="defaultLink"><a href="all-examples.html">Examples</a></li>
<li class="defaultLink"><a href="tutorials.html">Tutorials</a></li>
<li class="defaultLink"><a href="demos.html">Demos</a></li>
<li class="defaultLink"><a href="qdeclarativeexamples.html">QML Examples</a></li>
</ul>
</div>
</div>
</div>
<div class="wrap">
<div class="toolbar">
<div class="breadcrumb toolblock">
<ul>
<li class="first"><a href="index.html">Home</a></li>
<!-- Breadcrumbs go here -->
</ul>
</div>
<div class="toolbuttons toolblock">
<ul>
<li id="smallA" class="t_button">A</li>
<li id="medA" class="t_button active">A</li>
<li id="bigA" class="t_button">A</li>
<li id="print" class="t_button"><a href="javascript:this.print();">
<span>Print</span></a></li>
</ul>
</div>
</div>
<div class="content mainContent">
<h1 class="title">downloadmanager.cpp Example File</h1>
<span class="small-subtitle">network/downloadmanager/downloadmanager.cpp</span>
<!-- $$$network/downloadmanager/downloadmanager.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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:
**
** "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 Digia Plc and its Subsidiary(-ies) 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="qobject.html">QObject</a></span> <span class="operator">*</span>parent)
: <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>)
{
}
<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)
{
foreach (<span class="type"><a href="qstring.html">QString</a></span> url<span class="operator">,</span> urlList)
append(<span class="type"><a href="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="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="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="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="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)
{
<span class="type"><a href="qstring.html">QString</a></span> path <span class="operator">=</span> url<span class="operator">.</span>path();
<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();
<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="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="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)))
<span class="operator">+</span><span class="operator">+</span>i;
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);
}
<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="qurl.html">QUrl</a></span> url <span class="operator">=</span> downloadQueue<span class="operator">.</span>dequeue();
<span class="type"><a href="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="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="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="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="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>
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>)));
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="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)
{
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="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="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="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 -->
</div>
</div>
</div>
<div class="ft">
<span></span>
</div>
</div>
<div class="footer">
<p>
<acronym title="Copyright">©</acronym> 2013 Digia Plc and/or its
subsidiaries. Documentation contributions included herein are the copyrights of
their respective owners.</p>
<br />
<p>
The documentation provided herein is licensed under the terms of the
<a href="http://www.gnu.org/licenses/fdl.html">GNU Free Documentation
License version 1.3</a> as published by the Free Software Foundation.</p>
<p>
Documentation sources may be obtained from <a href="http://www.qt-project.org">
www.qt-project.org</a>.</p>
<br />
<p>
Digia, Qt and their respective logos are trademarks of Digia Plc
in Finland and/or other countries worldwide. All other trademarks are property
of their respective owners. <a title="Privacy Policy"
href="http://en.gitorious.org/privacy_policy/">Privacy Policy</a></p>
</div>
<script src="scripts/functions.js" type="text/javascript"></script>
</body>
</html>
