main.cpp Example File

ftpclient/main.cpp
 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the QtScxml module of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** Commercial License Usage
 ** Licensees holding valid commercial Qt licenses may use this file in
 ** accordance with the commercial license agreement provided with the
 ** Software or, alternatively, in accordance with the terms contained in
 ** a written agreement between you and The Qt Company. For licensing terms
 ** and conditions see https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include "ftpcontrolchannel.h"
 #include "ftpdatachannel.h"
 #include "simpleftp.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();
 }