class DataSource{
QMap<QNetworkReply*, QString> loadingData; }

void DataSource::loadData(const QString& host, const QString& url, const QString &data)
{
    QNetworkRequest netWorkRequest(QUrl("http://" + host + url));
    netWorkRequest.setRawHeader("User-Agent" , "Opera");
    QNetworkReply* reply = netWorkLoader->get(netWorkRequest);
    loadingData[reply] = data;
}

void DataSource::requestFinished(QNetworkReply* reply)
{
     if(reply->error()) {...}
     else
        if (loadingData.contains(reply)){
            QString data = loadingData[reply];
            loadingData.remove(reply);
            myReadData(data, reply->readAll()); }
    reply->deleteLater();
}

void DataSource::abortLoading()
{
    foreach (QNetworkReply* reply, loadingMap.keys())
        reply->abort();
    loadingData.clear();
}