ftpcontrolchannel.cpp Example File

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  #include "ftpcontrolchannel.h"

  FtpControlChannel::FtpControlChannel(QObject *parent) : QObject(parent)
  {
      connect(&m_socket, &QIODevice::readyRead, this, &FtpControlChannel::onReadyRead);
      connect(&m_socket, &QAbstractSocket::disconnected, this, &FtpControlChannel::closed);
      connect(&m_socket, &QAbstractSocket::connected, this, [this]() {
          emit opened(m_socket.localAddress(), m_socket.localPort());
      });
  }

  void FtpControlChannel::connectToServer(const QString &server)
  {
      m_socket.connectToHost(server, 21);
  }

  void FtpControlChannel::command(const QByteArray &command, const QByteArray &params)
  {
      QByteArray sendData = command;
      if (!params.isEmpty())
          sendData += " " + params;
      m_socket.write(sendData + "\r\n");
  }

  void FtpControlChannel::onReadyRead()
  {
      m_buffer.append(m_socket.readAll());
      int rn = -1;
      while ((rn = m_buffer.indexOf("\r\n")) != -1) {
          QByteArray received = m_buffer.mid(0, rn);
          m_buffer = m_buffer.mid(rn + 2);
          int space = received.indexOf(' ');
          if (space != -1) {
              int code = received.mid(0, space).toInt();
              if (code == 0)
                  emit info(received.mid(space + 1));
              else
                  emit reply(code, received.mid(space + 1));
          } else {
              emit invalidReply(received);
          }
      }
  }