ftpdatachannel.h Example File

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  #ifndef FTPDATACHANNEL_H
  #define FTPDATACHANNEL_H

  #include <QObject>
  #include <QTcpServer>
  #include <QTcpSocket>
  #include <QScopedPointer>

  class FtpDataChannel : public QObject
  {
      Q_OBJECT
  public:
      explicit FtpDataChannel(QObject *parent = 0);

      // Listen on a local address.
      void listen(const QHostAddress &address = QHostAddress::Any);

      // Send data over the socket.
      void sendData(const QByteArray &data);

      // Close the connection.
      void close();

      // Retrieve the port specification to be announced on the control channel.
      // Something like "a,b,c,d,xxx,yyy" where
      // - a.b.c.d would be the IP address in decimal/dot notation and
      // - xxx,yyy are the upper and lower 8 bits of the TCP port in decimal
      // (This will only work if the local address we're listening on is actually meaningful)
      QString portspec() const;

  signals:

      // The FTP server has sent some data.
      void dataReceived(const QByteArray &data);

  private:
      QTcpServer m_server;
      QScopedPointer<QTcpSocket> m_socket;
  };

  #endif // FTPDATACHANNEL_H