Qt 4.8: ftpreply.cpp Example File (webkit/webftpclient/ftpreply.cpp)

Qt Reference Documentation

# ftpreply.cpp Example File

webkit/webftpclient/ftpreply.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** 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 Nokia Corporation and its Subsidiary(-ies) nor
     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
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     #include <QTextDocument>
     #include <QtNetwork>
     #include "ftpreply.h"

     FtpReply::FtpReply(const QUrl &url)
         : QNetworkReply()
     {
         ftp = new QFtp(this);
         connect(ftp, SIGNAL(listInfo(QUrlInfo)), this, SLOT(processListInfo(QUrlInfo)));
         connect(ftp, SIGNAL(readyRead()), this, SLOT(processData()));
         connect(ftp, SIGNAL(commandFinished(int, bool)), this, SLOT(processCommand(int, bool)));

         offset = 0;
         units = QStringList() << tr("bytes") << tr("K") << tr("M") << tr("G")
                               << tr("Ti") << tr("Pi") << tr("Ei") << tr("Zi")
                               << tr("Yi");

         setUrl(url);
         ftp->connectToHost(url.host());
     }

     void FtpReply::processCommand(int, bool err)
     {
         if (err) {
             setError(ContentNotFoundError, tr("Unknown command"));
             emit error(ContentNotFoundError);
             return;
         }

         switch (ftp->currentCommand()) {
         case QFtp::ConnectToHost:
             ftp->login();
             break;

         case QFtp::Login:
             ftp->list(url().path());
             break;

         case QFtp::List:
             if (items.size() == 1)
                 ftp->get(url().path());
             else
                 setListContent();
             break;

         case QFtp::Get:
             setContent();

         default:
             ;
         }
     }

     void FtpReply::processListInfo(const QUrlInfo &urlInfo)
     {
         items.append(urlInfo);
     }

     void FtpReply::processData()
     {
         content += ftp->readAll();
     }

     void FtpReply::setContent()
     {
         open(ReadOnly | Unbuffered);
         setHeader(QNetworkRequest::ContentLengthHeader, QVariant(content.size()));
         emit readyRead();
         emit finished();
         ftp->close();
     }

     void FtpReply::setListContent()
     {
         QUrl u = url();
         if (!u.path().endsWith("/"))
             u.setPath(u.path() + "/");

         QString base_url = url().toString();
         QString base_path = u.path();

         open(ReadOnly | Unbuffered);
         QString content(
             "<html>\n"
             "<head>\n"
             "  <title>" + Qt::escape(base_url) + "</title>\n"
             "  <style type=\"text/css\">\n"
             "  th { background-color: #aaaaaa; color: black }\n"
             "  table { border: solid 1px #aaaaaa }\n"
             "  tr.odd { background-color: #dddddd; color: black\n }\n"
             "  tr.even { background-color: white; color: black\n }\n"
             "  </style>\n"
             "</head>\n\n"
             "<body>\n"
             "<h1>" + tr("Listing for %1").arg(base_path) + "</h1>\n\n"
             "<table align=\"center\" cellspacing=\"0\" width=\"90%\">\n"
             "<tr><th>Name</th><th>Size</th></tr>\n");

         QUrl parent = u.resolved(QUrl(".."));

         if (parent.isParentOf(u))

             content += QString("<tr><td><strong><a href=\"" + parent.toString() + "\">"
                 + tr("Parent directory") + "</a></strong></td><td></td></tr>\n");

         int i = 0;
         foreach (const QUrlInfo &item, items) {

             QUrl child = u.resolved(QUrl(item.name()));

             if (i == 0)
                 content += QString("<tr class=\"odd\">");
             else
                 content += QString("<tr class=\"even\">");

             content += QString("<td><a href=\"" + child.toString() + "\">"
                                + Qt::escape(item.name()) + "</a></td>");

             qint64 size = item.size();
             int unit = 0;
             while (size) {
                 qint64 new_size = size/1024;
                 if (new_size && unit < units.size()) {
                     size = new_size;
                     unit += 1;
                 } else
                     break;
             }

             if (item.isFile())
                 content += QString("<td>" + QString::number(size) + " "
                                    + units[unit] + "</td></tr>\n");
             else
                 content += QString("<td></td></tr>\n");

             i = 1 - i;
         }

         content += QString("</table>\n"
                            "</body>\n"
                            "</html>\n");

         this->content = content.toUtf8();

         setHeader(QNetworkRequest::ContentTypeHeader, QVariant("text/html; charset=UTF-8"));
         setHeader(QNetworkRequest::ContentLengthHeader, QVariant(this->content.size()));
         emit readyRead();
         emit finished();
         ftp->close();
     }

     // QIODevice methods

     void FtpReply::abort()
     {
     }

     qint64 FtpReply::bytesAvailable() const
     {
         return content.size() - offset;
     }

     bool FtpReply::isSequential() const
     {
         return true;
     }

     qint64 FtpReply::readData(char *data, qint64 maxSize)
     {
         if (offset < content.size()) {
             qint64 number = qMin(maxSize, content.size() - offset);
             memcpy(data, content.constData() + offset, number);
             offset += number;
             return number;
         } else
             return -1;
     }