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| ** |
| ** Copyright (C) 2017 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
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| ** This file is part of the examples of the Qt Toolkit. |
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| ** $QT_BEGIN_LICENSE:BSD$ |
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| ****************************************************************************/ |
| |
| #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'; |
| } |