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Diffstat (limited to 'examples/network/downloadmanager/downloadmanager.cpp')
| -rw-r--r-- | examples/network/downloadmanager/downloadmanager.cpp | 212 |
1 files changed, 0 insertions, 212 deletions
diff --git a/examples/network/downloadmanager/downloadmanager.cpp b/examples/network/downloadmanager/downloadmanager.cpp deleted file mode 100644 index cbad29541a..0000000000 --- a/examples/network/downloadmanager/downloadmanager.cpp +++ /dev/null @@ -1,212 +0,0 @@ -/**************************************************************************** -** -** 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." -** -** $QT_END_LICENSE$ -** -****************************************************************************/ - -#include "downloadmanager.h" - -#include <QTextStream> - -#include <cstdio> - -using namespace std; - -DownloadManager::DownloadManager(QObject *parent) - : QObject(parent) -{ -} - -void DownloadManager::append(const QStringList &urls) -{ - for (const QString &urlAsString : urls) - append(QUrl::fromEncoded(urlAsString.toLocal8Bit())); - - if (downloadQueue.isEmpty()) - QTimer::singleShot(0, this, &DownloadManager::finished); -} - -void DownloadManager::append(const QUrl &url) -{ - if (downloadQueue.isEmpty()) - QTimer::singleShot(0, this, &DownloadManager::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, &QNetworkReply::downloadProgress, - this, &DownloadManager::downloadProgress); - connect(currentDownload, &QNetworkReply::finished, - this, &DownloadManager::downloadFinished); - connect(currentDownload, &QNetworkReply::readyRead, - this, &DownloadManager::downloadReadyRead); - - // prepare the output - printf("Downloading %s...\n", url.toEncoded().constData()); - downloadTimer.start(); -} - -void DownloadManager::downloadProgress(qint64 bytesReceived, qint64 bytesTotal) -{ - progressBar.setStatus(bytesReceived, bytesTotal); - - // calculate the download speed - double speed = bytesReceived * 1000.0 / downloadTimer.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())); - output.remove(); - } else { - // let's check if it was actually a redirect - if (isHttpRedirect()) { - reportRedirect(); - output.remove(); - } else { - printf("Succeeded.\n"); - ++downloadedCount; - } - } - - currentDownload->deleteLater(); - startNextDownload(); -} - -void DownloadManager::downloadReadyRead() -{ - output.write(currentDownload->readAll()); -} - -bool DownloadManager::isHttpRedirect() const -{ - int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(); - return statusCode == 301 || statusCode == 302 || statusCode == 303 - || statusCode == 305 || statusCode == 307 || statusCode == 308; -} - -void DownloadManager::reportRedirect() -{ - int statusCode = currentDownload->attribute(QNetworkRequest::HttpStatusCodeAttribute).toInt(); - QUrl requestUrl = currentDownload->request().url(); - QTextStream(stderr) << "Request: " << requestUrl.toDisplayString() - << " was redirected with code: " << statusCode - << '\n'; - - QVariant target = currentDownload->attribute(QNetworkRequest::RedirectionTargetAttribute); - if (!target.isValid()) - return; - QUrl redirectUrl = target.toUrl(); - if (redirectUrl.isRelative()) - redirectUrl = requestUrl.resolved(redirectUrl); - QTextStream(stderr) << "Redirected to: " << redirectUrl.toDisplayString() - << '\n'; -} |