QIODevice dosn't work inside slot

Hi!

I've wrote a class which downloads a xml file from the internet. I made it just like it was in the documentation. Now I want to save downloaded data in the file. But the QIODevice dosn't work in void HttpDownload::replyFinished(QNetworkReply *reply) slot. In constructor and other functions its OK but in slot nothing happens. This is the code:
I commented what is wrong and what works ok.

httpdownload.h

Code:

#ifndef HTTPDOWNLOAD_H
#define HTTPDOWNLOAD_H
 
#include <QObject>
#include <QUrl>
 
class QIODevice;
//class QUrl;
class QNetworkRequest;
class QNetworkAccessManager;
class QNetworkReply;
 
 
class HttpDownload : QObject
{
    Q_OBJECT
 
public:
    HttpDownload(const QUrl &downloadUrl, QIODevice *dev);
    virtual ~HttpDownload();
 
    void asynchronous(const QUrl &url = QUrl());
 
private:
 
    inline void write(const char * str) {device->write(str);}
 
    const QUrl url;
    QIODevice *device;
    QNetworkRequest *request;
    QNetworkAccessManager *manager;
public slots:
   void replyFinished(QNetworkReply* reply);
 
};
 
#endif // HTTPDOWNLOAD_H

httpdownload.cpp

Code:

#include "HttpDownload.h"
 
#include <QNetworkAccessManager>
#include <QNetworkRequest>
#include <QIODevice>
#include <QByteArray>
#include <QNetworkReply>
#include <QIODevice>
 
#include <iostream>
 
HttpDownload::HttpDownload(const QUrl &downloadUrl, QIODevice *dev) : url(downloadUrl)
{
    device = dev;
 
    write("constructor"); // this works fine
 
    if( url.isValid()) {
        manager = new QNetworkAccessManager(this);
        request = new QNetworkRequest(url);
    } else {
        //throw exception
    }
 
 connect(manager, SIGNAL(finished(QNetworkReply*)),
         this, SLOT(replyFinished(QNetworkReply*)));
}
 
HttpDownload::~HttpDownload() {
 
    if(manager != NULL)
        delete manager;
    if(request != NULL)
        delete request;
}
 
void HttpDownload::asynchronous(const QUrl &downloadUrl) {
 
    write("asynchronous func"); // this also works
 
    if(!downloadUrl.isEmpty()) {
        delete request;
        request = new QNetworkRequest(downloadUrl);
    }
 
    manager->get(*request);
}
 
/* slot */
void HttpDownload::replyFinished(QNetworkReply *reply) {
 
   QByteArray array;
 
    if(! (array = reply->rawHeader(QByteArray("Location"))).isEmpty()) {
            this->asynchronous(QUrl(array));
            return;
        }
 
    write(" slotslotslot"); // nothing happens 
 
}

main.cpp

Code:

#include <QtCore/QCoreApplication>
#include "HttpDownload.h"
 
#include <QFile>
#include <QUrl>
#include <iostream>
#include <QString>
 
int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);
 
    QFile *file = new QFile("rssxml.dat");
    if (!file->open(QIODevice::WriteOnly | QIODevice::Text | QIODevice::Append))
        return 1;
 
    HttpDownload hd(QUrl("http://www.google.pl"), file);
    hd.asynchronous();
    file->flush();
    file->close();
 
    return a.exec();
}

Thank for help
s410i