（Qt或其他）在Windows桌面或explorer.exe上使用协议http或ftp拖放mime类型uri-list的数据

Question

How can I drag and drop a file from a protocol http and ftp to the Windows desktop or explorer.exe with Qt or any other library or language you use? It would be the same thing that I'm looking for.

For example: You can drag an Image using http protocol From Chrome browser and drop it to the Windows desktop.

My code works only with file:/// protocol. This code does not work.

QMimeData *mime = new QMimeData;
QList<QUrl> urls;
urls.push_back(QUrl("http://localhost/test/images.jpg"));
            mime->setUrls(urls);
            drag.setMimeData(mime);
            drag.setPixmap(QPixmap(":/Image (139).jpg"));
            drag.exec(Qt::MoveAction | Qt::CopyAction);

But this works fine:

QMimeData *mime = new QMimeData;
            QList<QUrl> urls;
            urls.push_back(QUrl("file:///c:/images.jpg"));
            mime->setUrls(urls);
            drag.setMimeData(mime);
            drag.setPixmap(QPixmap(":/Image (139).jpg"));
            drag.exec(Qt::MoveAction | Qt::CopyAction);

Answer 1

Save file from web to local computer (temp directory) and use method with file:/// protocol.

void MainWindow::downloadToTemp(QString p_FilePath)
{
    QNetworkReply *reply = manager->get(QNetworkRequest(QUrl(p_FilePath)));
    connect(reply, SIGNAL(finished()), this, SLOT(httpDownloadFinished()));
}

void MainWindow::httpDownloadFinished() {
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(QObject::sender());
    QString url = reply->url().toString();
    qDebug() << url;
    QString fileName = QDir::tempPath() + url.right(url.length() - url.lastIndexOf('/'));
    QFile file(fileName);
    if (file.open(QFile::WriteOnly)) {
        file.write(reply->readAll());
        file.flush();
        file.close();

        //Your file path - fileName
    }
}

Do not forget about error processing: QNetworkReply::error(QNetworkReply::NetworkError code)