Hello friends i am working on a software where i need to transfer data from one system to another using TCP/IP . I used the fortune client and fortune server example code as base and made this program but i am having problem in in receiving after the first transfer there is some problem not able to receive the data properly.

Data Sending Side
Qt Code: 
  1. tcpSocket = new QTcpSocket(this);
  2.         connect(tcpSocket, SIGNAL(clicked()), this, SLOT(on_pushButton_clicked()));
  3. 	 rowcnt=1;
  4. 	 tcpServer = new QTcpServer(this);
  5.      if (!tcpServer->listen()) {
  6.          QMessageBox::critical(this, tr("Data Server"),
  7.                                tr("Unable to start the server: %1.")
  8.                                .arg(tcpServer->errorString()));
  9.          close();
  10.          return;
  11.      }
  12.  
  13. 	 statusLabel->setText(tr("The server is running on port %1.\n"
  14.                              "Run the Fortune Client example now.")
  15.                           .arg(tcpServer->serverPort()));
  16.  
  17. }
  18.  
  19. ControlPanel::~ControlPanel()
  20. {
  21.  
  22. }
  23.  void ControlPanel::sendFortune()
  24.  {
  25.      QByteArray block;
  26.      QDataStream out(&block, QIODevice::WriteOnly);
  27.      out.setVersion(QDataStream::Qt_4_0);
  28.      out << (quint16)0;
  29.      out << tempdata; 
  30.      out.device()->seek(0);
  31.      out << (quint16)(block.size() - sizeof(quint16));
  32.  
  33.      QTcpSocket *clientConnection = tcpServer->nextPendingConnection();
  34.      connect(clientConnection, SIGNAL(disconnected()),
  35.              clientConnection, SLOT(deleteLater()));
  36.  
  37.      clientConnection->write(block);
  38.      //clientConnection->disconnectFromHost();
  39. 	 qDebug()<<tempdata;
  40. 	 tempdata.clear();
  41.  }
  42.  
  43. void ControlPanel::extract()
  44. {
  45. // Retrieving data from db and appending it to tempdata and then calling the function sendFortune()
  46.  
  47.  sendFortune();
  48. }
  49. void ControlPanel::on_pushButton_clicked()
  50. {
  51.     // I wanted to send data every Second so i am calling extract() every second.
  52. 	   connect(timerdraw, SIGNAL(timeout()), this, SLOT(extract())); 
  53. 	   timerdraw->start(1000);
  54. }
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This is the receiver side of the program.
Qt Code: 
  1. setupUi(this);
  2. 	 portLineEdit->setValidator(new QIntValidator(1, 65535, this));
  3. 	 tcpSocket = new QTcpSocket(this);
  4. 	 timerdraw = new QTimer(this);
  5. 	 timerreq = new QTimer(this);
  6.  
  7. 	 connect(hostLineEdit, SIGNAL(textChanged(const QString &)),
  8.              this, SLOT(enablepushButton()));
  9. 	 connect(portLineEdit, SIGNAL(textChanged(const QString &)),
  10.              this, SLOT(enablepushButton()));
  11.      //connect(pushButton, SIGNAL(clicked()),
  12.        //      this, SLOT(requestNewFortune()));
  13.      connect(pushButton_2, SIGNAL(clicked()), this, SLOT(close()));
  14.      connect(tcpSocket, SIGNAL(readyRead()), this, SLOT(readFortune()));
  15.      connect(tcpSocket, SIGNAL(error(QAbstractSocket::SocketError)),
  16.              this, SLOT(displayError(QAbstractSocket::SocketError)));
  17.  
  18.  
  19.  }
  20.  void TCP_DataReceiver::requestNewFortune()
  21.  {
  22.      pushButton->setEnabled(false);
  23. 	 blockSize = 0;
  24.      tcpSocket->abort();
  25.      tcpSocket->connectToHost(hostLineEdit->text(),
  26.                               portLineEdit->text().toInt());
  27.  }
  28.  void TCP_DataReceiver::readFortune()
  29.  {
  30.      QDataStream in(tcpSocket);
  31.      in.setVersion(QDataStream::Qt_4_0);
  32.  
  33.      if (blockSize == 0) 
  34. 	 {
  35.          if (tcpSocket->bytesAvailable() < (int)sizeof(quint16))
  36.              return;
  37.  
  38.          in >> blockSize;
  39.      }
  40.  
  41.      if (tcpSocket->bytesAvailable() < blockSize)
  42.          return;
  43.  
  44.      QString nextFortune;
  45.      in >> nextFortune;
  46.  
  47.  //    if (nextFortune == currentFortune)
  48.  //	 {
  49.  //       QTimer::singleShot(0, this, SLOT(requestNewFortune()));
  50.  //     return;
  51.  //     }
  52.  
  53.      currentFortune = nextFortune;
  54.  
  55.      statusLabel->setText(currentFortune);
  56.      textBrowser->append(currentFortune);
  57. 	 currentFortune.clear();
  58.        pushButton->setEnabled(true);
  59.  }
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I am not able to figure out if my problem is on the Data receiving side or the sending side. I have connected two windows systems with a cross cable RJ45 connector. I wanted to send data every second to the other system where i run the receiving side of the program.. The connection breaks after some data is transferred to other system.. Pls tell me if i am going wrong some where. ?

Thank You