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Diffstat (limited to 'examples/network/downloadmanager/downloadmanager.cpp')
| -rw-r--r-- | examples/network/downloadmanager/downloadmanager.cpp | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/examples/network/downloadmanager/downloadmanager.cpp b/examples/network/downloadmanager/downloadmanager.cpp new file mode 100644 index 0000000..a4721a2 --- /dev/null +++ b/examples/network/downloadmanager/downloadmanager.cpp @@ -0,0 +1,173 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** Contact: Qt Software Information (qt-info@nokia.com) +** +** This file is part of the examples of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the either Technology Preview License Agreement or the +** Beta Release License Agreement. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain +** additional rights. These rights are described in the Nokia Qt LGPL +** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this +** package. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 3.0 as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU General Public License version 3.0 requirements will be +** met: http://www.gnu.org/copyleft/gpl.html. +** +** If you are unsure which license is appropriate for your use, please +** contact the sales department at qt-sales@nokia.com. +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "downloadmanager.h" + +#include <QFileInfo> +#include <QNetworkRequest> +#include <QNetworkReply> +#include <QString> +#include <QStringList> +#include <QTimer> +#include <stdio.h> + +DownloadManager::DownloadManager(QObject *parent) + : QObject(parent), downloadedCount(0), totalCount(0) +{ +} + +void DownloadManager::append(const QStringList &urlList) +{ + foreach (QString url, urlList) + append(QUrl::fromEncoded(url.toLocal8Bit())); + + if (downloadQueue.isEmpty()) + QTimer::singleShot(0, this, SIGNAL(finished())); +} + +void DownloadManager::append(const QUrl &url) +{ + if (downloadQueue.isEmpty()) + QTimer::singleShot(0, this, SLOT(startNextDownload())); + + downloadQueue.enqueue(url); + ++totalCount; +} + +QString DownloadManager::saveFileName(const QUrl &url) +{ + QString path = url.path(); + QString basename = QFileInfo(path).fileName(); + + if (basename.isEmpty()) + basename = "download"; + + if (QFile::exists(basename)) { + // already exists, don't overwrite + int i = 0; + basename += '.'; + while (QFile::exists(basename + QString::number(i))) + ++i; + + basename += QString::number(i); + } + + return basename; +} + +void DownloadManager::startNextDownload() +{ + if (downloadQueue.isEmpty()) { + printf("%d/%d files downloaded successfully\n", downloadedCount, totalCount); + emit finished(); + return; + } + + QUrl url = downloadQueue.dequeue(); + + QString filename = saveFileName(url); + output.setFileName(filename); + if (!output.open(QIODevice::WriteOnly)) { + fprintf(stderr, "Problem opening save file '%s' for download '%s': %s\n", + qPrintable(filename), url.toEncoded().constData(), + qPrintable(output.errorString())); + + startNextDownload(); + return; // skip this download + } + + QNetworkRequest request(url); + currentDownload = manager.get(request); + connect(currentDownload, SIGNAL(downloadProgress(qint64,qint64)), + SLOT(downloadProgress(qint64,qint64))); + connect(currentDownload, SIGNAL(finished()), + SLOT(downloadFinished())); + connect(currentDownload, SIGNAL(readyRead()), + SLOT(downloadReadyRead())); + + // prepare the output + printf("Downloading %s...\n", url.toEncoded().constData()); + downloadTime.start(); +} + +void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal) +{ + progressBar.setStatus(bytesReceived, bytesTotal); + + // calculate the download speed + double speed = bytesReceived * 1000.0 / downloadTime.elapsed(); + QString unit; + if (speed < 1024) { + unit = "bytes/sec"; + } else if (speed < 1024*1024) { + speed /= 1024; + unit = "kB/s"; + } else { + speed /= 1024*1024; + unit = "MB/s"; + } + + progressBar.setMessage(QString::fromLatin1("%1 %2") + .arg(speed, 3, 'f', 1).arg(unit)); + progressBar.update(); +} + +void DownloadManager::downloadFinished() +{ + progressBar.clear(); + output.close(); + + if (currentDownload->error()) { + // download failed + fprintf(stderr, "Failed: %s\n", qPrintable(currentDownload->errorString())); + } else { + printf("Succeeded.\n"); + ++downloadedCount; + } + + currentDownload->deleteLater(); + startNextDownload(); +} + +void DownloadManager::downloadReadyRead() +{ + output.write(currentDownload->readAll()); +} |