Paste code

#ifndef DOWNLOADITEM_H
#define DOWNLOADITEM_H

#include <QtCore>
#include <QtNetwork/QtNetwork>
#include <QDebug>
#include <QFile>
#include <QtGui>
#include <QString>


class downLoadItem : QMainWindow(QWidget *parent)
{
public:
    downLoadItem(QString link);

    QFile file;
    QNetworkAccessManager *pNetManager;

public slots:
    void slotReadyRead();
    void slotError(QNetworkReply::NetworkError);
    void slotFinished();
};


#endif // DOWNLOADITEM_H


// .cpp

#include <downLoadItem.h>
#include <QtCore>

downLoadItem::downLoadItem
{
    pNetManager = new QNetworkAccessManager(this);

    QNetworkRequest request;
    request.setUrl(QUrl(link));

    QNetworkReply *reply = pNetManager->get(request);
    connect(reply, SIGNAL(readyRead()), this, SLOT(slotReadyRead()));
    connect(reply, SIGNAL(error(QNetworkReply::NetworkError)),
                this, SLOT(slotError(QNetworkReply::NetworkError)));
    connect(reply, SIGNAL(finished()), this, SLOT(slotFinished()));
    file.setFileName("lost.avi");
    file.open(QIODevice::WriteOnly);
}
void downLoadItem::slotError(QNetworkReply::NetworkError)
{

}
void downLoadItem::slotFinished()
{
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());
    file.close();
    reply->deleteLater();
}
void downLoadItem::slotReadyRead()
{
    QNetworkReply *reply = qobject_cast<QNetworkReply*>(sender());
    file.write(reply->readAll());
}