main.cpp Example File

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  #include "simpleftp.h"
  #include "ftpcontrolchannel.h"
  #include "ftpdatachannel.h"
  #include <QCoreApplication>
  #include <iostream>

  struct Command {
      QString cmd;
      QString args;
  };

  int main(int argc, char *argv[])
  {
      if (argc != 3) {
          qDebug() << "Usage: ftpclient <server> <file>";
          return 1;
      }

      QString server = QString::fromLocal8Bit(argv[1]);
      QString file = QString::fromLocal8Bit(argv[2]);

      QCoreApplication app(argc, argv);
      FtpClient ftpClient;
      FtpDataChannel dataChannel;
      FtpControlChannel controlChannel;

      // Print all data retrieved from the server on the console.
      QObject::connect(&dataChannel, &FtpDataChannel::dataReceived, [](const QByteArray &data) {
          std::cout << data.constData();
      });

      // Translate server replies into state machine events.
      QObject::connect(&controlChannel, &FtpControlChannel::reply, &ftpClient,
                       [&ftpClient](int code, const QString &parameters) {
          ftpClient.submitEvent(QString("reply.%1xx").arg(code / 100), parameters);
      });

      // Translate commands from the state machine into FTP control messages.
      ftpClient.connectToEvent("submit.cmd", &controlChannel,
                               [&controlChannel](const QScxmlEvent &event) {
          controlChannel.command(event.name().mid(11).toUtf8(),
                                 event.data().toMap()["params"].toByteArray());
      });

      // Commands to be sent
      QList<Command> commands({
          {"cmd.USER", "anonymous"},// login
          {"cmd.PORT", ""},         // announce port for data connection, args added below.
          {"cmd.RETR", file}        // retrieve a file
      });

      // When entering "B" state, send the next command.
      ftpClient.connectToState("B", QScxmlStateMachine::onEntry([&]() {
          if (commands.isEmpty()) {
              app.quit();
              return;
          }
          Command command = commands.takeFirst();
          qDebug() << "Posting command" << command.cmd << command.args;
          ftpClient.submitEvent(command.cmd, command.args);
      }));

      // If the server asks for a password, send one.
      ftpClient.connectToState("P", QScxmlStateMachine::onEntry([&ftpClient]() {
          qDebug() << "Sending password";
          ftpClient.submitEvent("cmd.PASS", QString());
      }));

      // Connect to our own local FTP server
      controlChannel.connectToServer(server);
      QObject::connect(&controlChannel, &FtpControlChannel::opened,
                       [&](const QHostAddress &address, int) {
          dataChannel.listen(address);
          commands[1].args = dataChannel.portspec();
          ftpClient.start();
      });

      return app.exec();
  }