source: trunk/examples/network/downloadmanager/downloadmanager.cpp

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** This file is part of the examples of the Qt Toolkit.
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#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();
}