Hi, i need to implement a ftp client that has a resume upload feature using QFtp.

I have tried implementing the resume function using raw commands ... something like the following:

Qt Code: 
  1. ftp->rawCommand("TYPE I");
  2. ftp->rawCommand("PASV");
  3. ftp->rawCommand("REST" + x); //where x is the string with the position ...
  4. ftp->rawCommand("STOR" + remoteFileName);
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however i am getting the following error:

425 :: "Can't open data connection."

I have looked over the QFtp sourcefile and i saw that the ftp data channel isn't opened when using raw commands.
I have tried opening a data channel using a QTcpSocket like this :

Qt Code: 
  1. void FtpClass::onRawCmdReply(int replyCode, const QString & detail )
  2. {
  3.     qDebug() << replyCode << " :: " << detail;
  4.  
  5.     if (replyCode == 227)  // detail = Entering Passive Mode (a1,a2,a3,a4,p1,p2)
  6.                                      // host = a1.a2.a3.a4
  7.                                      // port = p1*256 + p2
  8.     {
  9.         QRegExp addrPortPattern(QLatin1String("(\\d+),(\\d+),(\\d+),(\\d+),(\\d+),(\\d+)"));
  10.         if (addrPortPattern.indexIn(detail) == -1)
  11.         {
  12.             {
  13.                 qDebug("QFtp: bad 227 response -- address and port information missing");
  14.             }
  15.         }
  16.         else
  17.         {
  18.             _dataSocket = new QTcpSocket(this);
  19.             QStringList lst = addrPortPattern.capturedTexts();
  20.             QString host = lst[1] + QLatin1Char('.') + lst[2] + QLatin1Char('.') + lst[3] + QLatin1Char('.') + lst[4];
  21.             quint16 port = (lst[5].toUInt() << 8) + lst[6].toUInt();
  22.             _dataSocket->connectToHost(host, port);
  23.             if (!_dataSocket->waitForConnected(1000))
  24.             {
  25.                 qDebug() << "cannot connect to: " << host << "port :" << port;
  26.             }
  27.             else
  28.             {
  29.                 qDebug() << "connected to: " << host << "port :" << port;
  30.             }
  31.         }
  32.     }
  33. }
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But if i do that i get the following error :

426 :: "Connection closed; transfer aborted."

It is not a server issue since i've tested using a random ftp client and the server supports resuming.
Also it is not a firewall issue since i dissabled the firewalls on both machines.

What am i doing wrong ? can someone help me please?