/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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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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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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#include <QCoreApplication>+
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#include <QFile>+
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#include <QFileInfo>+
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#include <QList>+
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#include <QNetworkAccessManager>+
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#include <QNetworkRequest>+
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#include <QNetworkReply>+
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#include <QStringList>+
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#include <QTimer>+
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#include <QUrl>+
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+
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#include <stdio.h>+
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+
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class DownloadManager: public QObject+
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{+
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    Q_OBJECT+
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    QNetworkAccessManager manager;+
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    QList<QNetworkReply *> currentDownloads;+
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+
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public:+
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    DownloadManager();+
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    void doDownload(const QUrl &url);+
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    QString saveFileName(const QUrl &url);+
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    bool saveToDisk(const QString &filename, QIODevice *data);+
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+
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public slots:+
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    void execute();+
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    void downloadFinished(QNetworkReply *reply);+
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};+
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+
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DownloadManager::DownloadManager()+
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{+
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    connect(&manager, SIGNAL(finished(QNetworkReply*)),+
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            SLOT(downloadFinished(QNetworkReply*)));+
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}+
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+
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void DownloadManager::doDownload(const QUrl &url)+
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{+
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    QNetworkRequest request(url);+
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    QNetworkReply *reply = manager.get(request);+
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+
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    currentDownloads.append(reply);+
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}+
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+
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QString DownloadManager::saveFileName(const QUrl &url)+
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{+
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    QString path = url.path();+
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    QString basename = QFileInfo(path).fileName();+
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+
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    if (basename.isEmpty())+
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        basename = "download";+
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+
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    if (QFile::exists(basename)) {+
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        // already exists, don't overwrite+
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        int i = 0;+
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        basename += '.';+
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        while (QFile::exists(basename + QString::number(i)))+
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            ++i;+
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+
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        basename += QString::number(i);+
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    }+
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+
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    return basename;+
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}+
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+
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bool DownloadManager::saveToDisk(const QString &filename, QIODevice *data)+
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{+
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    QFile file(filename);+
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    if (!file.open(QIODevice::WriteOnly)) {+
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        fprintf(stderr, "Could not open %s for writing: %s\n",+
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                qPrintable(filename),+
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                qPrintable(file.errorString()));+
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        return false;+
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    }+
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+
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    file.write(data->readAll());+
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    file.close();+
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+
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    return true;+
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}+
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+
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void DownloadManager::execute()+
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{+
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    QStringList args = QCoreApplication::instance()->arguments();+
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    args.takeFirst();           // skip the first argument, which is the program's name+
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    if (args.isEmpty()) {+
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        printf("Qt Download example - downloads all URLs in parallel\n"+
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               "Usage: download url1 [url2... urlN]\n"+
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               "\n"+
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               "Downloads the URLs passed in the command-line to the local directory\n"+
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               "If the target file already exists, a .0, .1, .2, etc. is appended to\n"+
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               "differentiate.\n");+
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        QCoreApplication::instance()->quit();+
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        return;+
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    }+
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+
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    foreach (QString arg, args) {+
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        QUrl url = QUrl::fromEncoded(arg.toLocal8Bit());+
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        doDownload(url);+
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    }+
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}+
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+
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void DownloadManager::downloadFinished(QNetworkReply *reply)+
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{+
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    QUrl url = reply->url();+
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    if (reply->error()) {+
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        fprintf(stderr, "Download of %s failed: %s\n",+
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                url.toEncoded().constData(),+
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                qPrintable(reply->errorString()));+
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    } else {+
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        QString filename = saveFileName(url);+
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        if (saveToDisk(filename, reply))+
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            printf("Download of %s succeded (saved to %s)\n",+
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                   url.toEncoded().constData(), qPrintable(filename));+
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    }+
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+
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    currentDownloads.removeAll(reply);+
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    reply->deleteLater();+
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+
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    if (currentDownloads.isEmpty())+
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        // all downloads finished+
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        QCoreApplication::instance()->quit();+
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}+
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+
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int main(int argc, char **argv)+
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{+
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    QCoreApplication app(argc, argv);+
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+
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    DownloadManager manager;+
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    QTimer::singleShot(0, &manager, SLOT(execute()));+
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+
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    app.exec();+
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}+
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+
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#include "main.moc"+
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