Qt Code: 
  1. void MyServer::slotReadClient()
  2. {
  3.   QTcpSocket* pClientSocket = (QTcpSocket *)sender();
  4.   QDataStream in( pClientSocket );
  5.  
  6.   in.setVersion( QDataStream::Qt_4_7 );
  7.  
  8.   for (;;)
  9.   {
  10.     if (!m_nNextBlockSize)
  11.     {
  12.       if (pClientSocket->bytesAvailable() < sizeof( quint16 ))
  13.         break;
  14.  
  15.       in >> m_nNextBlockSize;
  16.     }
  17.  
  18.     if (pClientSocket->bytesAvailable() < m_nNextBlockSize)
  19.       break;
  20.  
  21.     QTime time;
  22.     QString str;
  23.  
  24.     in >> time >> str;
  25.  
  26.     QString strMessage = time.toString() + " " + "Client has sended - " + str;
  27.     m_ptxt->append( strMessage );
  28.  
  29.     m_nNextBlockSize = 0;
  30.  
  31.     sendToClient( pClientSocket, "Server Response: Received \"" + str + "\"" );
  32.   }
  33. }
  34.  
  35. // ----------------------------------------------------------------------
  36. void MyServer::sendToClient( QTcpSocket *pSocket, const QString &str )
  37. {
  38.   QByteArray arrBlock;
  39.   QDataStream out( &arrBlock, QIODevice::WriteOnly );
  40.  
  41.   out.setVersion( QDataStream::Qt_4_7 );
  42.   out << quint16(0) << QTime::currentTime() << str;
  43.  
  44.   out.device()->seek(0);
  45.   out << quint16( arrBlock.size() - sizeof( quint16 ) );
  46.  
  47.   pSocket->write( arrBlock );
  48. }
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