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     2 **

     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

     7 ** This file is part of the examples of the Qt Toolkit.

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     9 ** $QT_BEGIN_LICENSE:LGPL$

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    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "downloadmanager.h"

    43 

    44 #include <QFileInfo>

    45 #include <QNetworkRequest>

    46 #include <QNetworkReply>

    47 #include <QString>

    48 #include <QStringList>

    49 #include <QTimer>

    50 #include <stdio.h>

    51 

    52 DownloadManager::DownloadManager(QObject *parent)

    53     : QObject(parent), downloadedCount(0), totalCount(0)

    54 {

    55 }

    56 

    57 void DownloadManager::append(const QStringList &urlList)

    58 {

    59     foreach (QString url, urlList)

    60         append(QUrl::fromEncoded(url.toLocal8Bit()));

    61 

    62     if (downloadQueue.isEmpty())

    63         QTimer::singleShot(0, this, SIGNAL(finished()));

    64 }

    65 

    66 void DownloadManager::append(const QUrl &url)

    67 {

    68     if (downloadQueue.isEmpty())

    69         QTimer::singleShot(0, this, SLOT(startNextDownload()));

    70 

    71     downloadQueue.enqueue(url);

    72     ++totalCount;

    73 }

    74 

    75 QString DownloadManager::saveFileName(const QUrl &url)

    76 {

    77     QString path = url.path();

    78     QString basename = QFileInfo(path).fileName();

    79 

    80     if (basename.isEmpty())

    81         basename = "download";

    82 

    83     if (QFile::exists(basename)) {

    84         // already exists, don't overwrite

    85         int i = 0;

    86         basename += '.';

    87         while (QFile::exists(basename + QString::number(i)))

    88             ++i;

    89 

    90         basename += QString::number(i);

    91     }

    92 

    93     return basename;

    94 }

    95 

    96 void DownloadManager::startNextDownload()

    97 {

    98     if (downloadQueue.isEmpty()) {

    99         printf("%d/%d files downloaded successfully\n", downloadedCount, totalCount);

   100         emit finished();

   101         return;

   102     }

   103 

   104     QUrl url = downloadQueue.dequeue();

   105 

   106     QString filename = saveFileName(url);

   107     output.setFileName(filename);

   108     if (!output.open(QIODevice::WriteOnly)) {

   109         fprintf(stderr, "Problem opening save file '%s' for download '%s': %s\n",

   110                 qPrintable(filename), url.toEncoded().constData(),

   111                 qPrintable(output.errorString()));

   112 

   113         startNextDownload();

   114         return;                 // skip this download

   115     }

   116 

   117     QNetworkRequest request(url);

   118     currentDownload = manager.get(request);

   119     connect(currentDownload, SIGNAL(downloadProgress(qint64,qint64)),

   120             SLOT(downloadProgress(qint64,qint64)));

   121     connect(currentDownload, SIGNAL(finished()),

   122             SLOT(downloadFinished()));

   123     connect(currentDownload, SIGNAL(readyRead()),

   124             SLOT(downloadReadyRead()));

   125 

   126     // prepare the output

   127     printf("Downloading %s...\n", url.toEncoded().constData());

   128     downloadTime.start();

   129 }

   130 

   131 void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal)

   132 {

   133     progressBar.setStatus(bytesReceived, bytesTotal);

   134 

   135     // calculate the download speed

   136     double speed = bytesReceived * 1000.0 / downloadTime.elapsed();

   137     QString unit;

   138     if (speed < 1024) {

   139         unit = "bytes/sec";

   140     } else if (speed < 1024*1024) {

   141         speed /= 1024;

   142         unit = "kB/s";

   143     } else {

   144         speed /= 1024*1024;

   145         unit = "MB/s";

   146     }

   147 

   148     progressBar.setMessage(QString::fromLatin1("%1 %2")

   149                            .arg(speed, 3, 'f', 1).arg(unit));

   150     progressBar.update();

   151 }

   152 

   153 void DownloadManager::downloadFinished()

   154 {

   155     progressBar.clear();

   156     output.close();

   157 

   158     if (currentDownload->error()) {

   159         // download failed

   160         fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString()));

   161     } else {

   162         printf("Succeeded.\n");

   163         ++downloadedCount;

   164     }

   165 

   166     currentDownload->deleteLater();

   167     startNextDownload();

   168 }

   169 

   170 void DownloadManager::downloadReadyRead()

   171 {

   172     output.write(currentDownload->readAll());

   173 }