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# ftpwindow.cpp Example File
network/ftp/ftpwindow.cpp

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     #include <QtGui>
     #include <QtNetwork>

     #include "ftpwindow.h"

     FtpWindow::FtpWindow(QWidget *parent)
         : QDialog(parent), ftp(0)
     {
         ftpServerLabel = new QLabel(tr("Ftp &server:"));
         ftpServerLineEdit = new QLineEdit("ftp.trolltech.com");
         ftpServerLabel->setBuddy(ftpServerLineEdit);

         statusLabel = new QLabel(tr("Please enter the name of an FTP server."));

         fileList = new QTreeWidget;
         fileList->setEnabled(false);
         fileList->setRootIsDecorated(false);
         fileList->setHeaderLabels(QStringList() << tr("Name") << tr("Size") << tr("Owner") << tr("Group") << tr("Time"));
         fileList->header()->setStretchLastSection(false);

         connectButton = new QPushButton(tr("Connect"));
         connectButton->setDefault(true);

         cdToParentButton = new QPushButton;
         cdToParentButton->setIcon(QPixmap(":/images/cdtoparent.png"));
         cdToParentButton->setEnabled(false);

         downloadButton = new QPushButton(tr("Download"));
         downloadButton->setEnabled(false);

         quitButton = new QPushButton(tr("Quit"));

         buttonBox = new QDialogButtonBox;
         buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
         buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);

         progressDialog = new QProgressDialog(this);

         connect(fileList, SIGNAL(itemActivated(QTreeWidgetItem *, int)),
                 this, SLOT(processItem(QTreeWidgetItem *, int)));
         connect(fileList, SIGNAL(currentItemChanged(QTreeWidgetItem *, QTreeWidgetItem *)),
                 this, SLOT(enableDownloadButton()));
         connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));
         connect(connectButton, SIGNAL(clicked()), this, SLOT(connectOrDisconnect()));
         connect(cdToParentButton, SIGNAL(clicked()), this, SLOT(cdToParent()));
         connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));
         connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

         QHBoxLayout *topLayout = new QHBoxLayout;
         topLayout->addWidget(ftpServerLabel);
         topLayout->addWidget(ftpServerLineEdit);
         topLayout->addWidget(cdToParentButton);
         topLayout->addWidget(connectButton);

         QVBoxLayout *mainLayout = new QVBoxLayout;
         mainLayout->addLayout(topLayout);
         mainLayout->addWidget(fileList);
         mainLayout->addWidget(statusLabel);
         mainLayout->addWidget(buttonBox);
         setLayout(mainLayout);

         setWindowTitle(tr("FTP"));
     }

     QSize FtpWindow::sizeHint() const
     {
         return QSize(500, 300);
     }

     void FtpWindow::connectOrDisconnect()
     {
         if (ftp) {
             ftp->abort();
             ftp->deleteLater();
             ftp = 0;
             fileList->setEnabled(false);
             cdToParentButton->setEnabled(false);
             downloadButton->setEnabled(false);
             connectButton->setEnabled(true);
             connectButton->setText(tr("Connect"));
             setCursor(Qt::ArrowCursor);
             return;
         }

         setCursor(Qt::WaitCursor);

         ftp = new QFtp(this);
         connect(ftp, SIGNAL(commandFinished(int, bool)),
                 this, SLOT(ftpCommandFinished(int, bool)));
         connect(ftp, SIGNAL(listInfo(const QUrlInfo &)),
                 this, SLOT(addToList(const QUrlInfo &)));
         connect(ftp, SIGNAL(dataTransferProgress(qint64, qint64)),
                 this, SLOT(updateDataTransferProgress(qint64, qint64)));

         fileList->clear();
         currentPath.clear();
         isDirectory.clear();

         QUrl url(ftpServerLineEdit->text());
         if (!url.isValid() || url.scheme().toLower() != QLatin1String("ftp")) {
             ftp->connectToHost(ftpServerLineEdit->text(), 21);
             ftp->login();
         } else {
             ftp->connectToHost(url.host(), url.port(21));

             if (!url.userName().isEmpty())
                 ftp->login(QUrl::fromPercentEncoding(url.userName().toLatin1()), url.password());
             else
                 ftp->login();
             if (!url.path().isEmpty())
                 ftp->cd(url.path());
         }

         fileList->setEnabled(true);
         connectButton->setEnabled(false);
         connectButton->setText(tr("Disconnect"));
         statusLabel->setText(tr("Connecting to FTP server %1...")
                              .arg(ftpServerLineEdit->text()));
     }

     void FtpWindow::downloadFile()
     {
         QString fileName = fileList->currentItem()->text(0);

         if (QFile::exists(fileName)) {
             QMessageBox::information(this, tr("FTP"),
                                      tr("There already exists a file called %1 in "
                                         "the current directory.")
                                      .arg(fileName));
             return;
         }

         file = new QFile(fileName);
         if (!file->open(QIODevice::WriteOnly)) {
             QMessageBox::information(this, tr("FTP"),
                                      tr("Unable to save the file %1: %2.")
                                      .arg(fileName).arg(file->errorString()));
             delete file;
             return;
         }

         ftp->get(fileList->currentItem()->text(0), file);

         progressDialog->setLabelText(tr("Downloading %1...").arg(fileName));
         downloadButton->setEnabled(false);
         progressDialog->exec();
     }

     void FtpWindow::cancelDownload()
     {
         ftp->abort();
     }

     void FtpWindow::ftpCommandFinished(int, bool error)
     {
         setCursor(Qt::ArrowCursor);

         if (ftp->currentCommand() == QFtp::ConnectToHost) {
             if (error) {
                 QMessageBox::information(this, tr("FTP"),
                                          tr("Unable to connect to the FTP server "
                                             "at %1. Please check that the host "
                                             "name is correct.")
                                          .arg(ftpServerLineEdit->text()));
                 connectOrDisconnect();
                 return;
             }

             statusLabel->setText(tr("Logged onto %1.")
                                  .arg(ftpServerLineEdit->text()));
             fileList->setFocus();
             downloadButton->setDefault(true);
             connectButton->setEnabled(true);
             return;
         }

         if (ftp->currentCommand() == QFtp::Login)
             ftp->list();

         if (ftp->currentCommand() == QFtp::Get) {
             if (error) {
                 statusLabel->setText(tr("Canceled download of %1.")
                                      .arg(file->fileName()));
                 file->close();
                 file->remove();
             } else {
                 statusLabel->setText(tr("Downloaded %1 to current directory.")
                                      .arg(file->fileName()));
                 file->close();
             }
             delete file;
             enableDownloadButton();
             progressDialog->hide();
         } else if (ftp->currentCommand() == QFtp::List) {
             if (isDirectory.isEmpty()) {
                 fileList->addTopLevelItem(new QTreeWidgetItem(QStringList() << tr("<empty>")));
                 fileList->setEnabled(false);
             }
         }
     }

     void FtpWindow::addToList(const QUrlInfo &urlInfo)
     {
         QTreeWidgetItem *item = new QTreeWidgetItem;
         item->setText(0, urlInfo.name());
         item->setText(1, QString::number(urlInfo.size()));
         item->setText(2, urlInfo.owner());
         item->setText(3, urlInfo.group());
         item->setText(4, urlInfo.lastModified().toString("MMM dd yyyy"));

         QPixmap pixmap(urlInfo.isDir() ? ":/images/dir.png" : ":/images/file.png");
         item->setIcon(0, pixmap);

         isDirectory[urlInfo.name()] = urlInfo.isDir();
         fileList->addTopLevelItem(item);
         if (!fileList->currentItem()) {
             fileList->setCurrentItem(fileList->topLevelItem(0));
             fileList->setEnabled(true);
         }
     }

     void FtpWindow::processItem(QTreeWidgetItem *item, int /*column*/)
     {
         QString name = item->text(0);
         if (isDirectory.value(name)) {
             fileList->clear();
             isDirectory.clear();
             currentPath += "/" + name;
             ftp->cd(name);
             ftp->list();
             cdToParentButton->setEnabled(true);
             setCursor(Qt::WaitCursor);
             return;
         }
     }

     void FtpWindow::cdToParent()
     {
         setCursor(Qt::WaitCursor);
         fileList->clear();
         isDirectory.clear();
         currentPath = currentPath.left(currentPath.lastIndexOf('/'));
         if (currentPath.isEmpty()) {
             cdToParentButton->setEnabled(false);
             ftp->cd("/");
         } else {
             ftp->cd(currentPath);
         }
         ftp->list();
     }

     void FtpWindow::updateDataTransferProgress(qint64 readBytes,
                                                qint64 totalBytes)
     {
         progressDialog->setMaximum(totalBytes);
         progressDialog->setValue(readBytes);
     }

     void FtpWindow::enableDownloadButton()
     {
         QTreeWidgetItem *current = fileList->currentItem();
         if (current) {
             QString currentFile = current->text(0);
             downloadButton->setEnabled(!isDirectory.value(currentFile));
         } else {
             downloadButton->setEnabled(false);
         }
     }