main.cpp Example File | Qt SCXML 5.9

Qt 5.9 | Qt SCXML | Qt SCXML FTP Client Example | main.cpp Example File

Qt 5.9.4 Reference Documentation

# main.cpp Example File

ftpclient/main.cpp

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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();
      }