QFtp get not working

Question

Greeting

Im trying to download file with QT 4.8 and VS 2008 but i cant, It fail all the time.

I use following code to download file from FTP server.

void FTP::download(QString strFileName, QString strFTPFileName)
{
    QFile * file = new QFile(strFileName);
    if (m_fFile->open(QIODevice::ReadWrite))
    {
        QString strFtpServerIPAddress("192.168.7.10");
        QString strFtpServerPortNumber("21");
        QString strFtpUserName("admin");
        QString strFtpPassword("admin");
        QString strFtpFolderPath("\outgoing\");
        qint16 iFtpPort = 21;

        QFtp * ftp = new QFtp();    
        connect(ftp, SIGNAL(stateChanged(int)),SLOT(onStateChanged(int)));
        connect(ftp, SIGNAL(done(bool)),SLOT(onDone(bool)));
        connect(m_objFtp, SIGNAL(commandFinished(int, bool)),SLOT(onCommandFinished(int, bool)));

        int iConnectToHostID = ftp->connectToHost(strFtpServerIPAddress, iFtpPort);
        int iLogInID = ftp->login(strFtpUserName, strFtpPassword); 
        int iChangeDirectoryID = ftp->cd(strFtpFolderPath);

        QFileInfo fileInfo(strFTPFileName);
        QString strFileNameOnly(fileInfo.fileName());
        int iOperationID = ftp->get(strFileNameOnly, file);

        QEventLoop loop;
        connect(this, SIGNAL(finished()), &loop, SLOT(quit()));
        loop.exec();

        ftp->close();
        file->close();
        delete ftp;
    }
}

void FTP::onDone(bool bError)
{
    ...
    //If "id" (saved from onStateChanged) is equal to "iOperationID", I emit "finished" Signal
    ...
}

I was checking onCommandFinished slot and all steps (HostLookup, Connecting, Connected, LoggedIn) finish without error but exactly in get operation, error is true and when i get detail about error with following codes ,

string strReason = QFtp::errorString().toStdString();
int iError = QFtp::error();

strReason is Unknown error and iError is 0.

Any idea what is going wrong here ?

Thanks in advanced

EDIT 1

I found the problem. Some how i cant download file from root directory, If i try to download file inside another directory, It work.

In my code , I check if strFtpFolderPath is empty or equal to ".", In this case i change directory with ftp->cd("/") other wise i set it to given path.

Any idea why i cant download file from root directory?