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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">ftpwindow.cpp Example File<br /><small><small>network/ftp/ftpwindow.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

** packaging of this file.

** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for

** information about Qt Commercial License Agreements.

** See http://www.trolltech.com/qpl/ for QPL licensing information.

** See http://www.trolltech.com/gpl/ for GPL licensing information.

** Contact info@trolltech.com if any conditions of this licensing are

** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

#include <QtGui>

#include <QtNetwork>

#include "ftpwindow.h"

FtpWindow::FtpWindow(QWidget *parent)

: QDialog(parent)

{

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 QListWidget;

connectButton = new QPushButton(tr("Connect"));

connectButton->setDefault(true);

downloadButton = new QPushButton(tr("Download"));

downloadButton->setEnabled(false);

cdToParentButton = new QPushButton;

cdToParentButton->setIcon(QPixmap(":/images/cdtoparent.png"));

cdToParentButton->setEnabled(false);

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

ftp = new QFtp(this);

progressDialog = new QProgressDialog(this);

connect(ftpServerLineEdit, SIGNAL(textChanged(const QString &)),

this, SLOT(enableConnectButton()));

connect(fileList, SIGNAL(itemDoubleClicked(QListWidgetItem *)),

this, SLOT(processItem(QListWidgetItem *)));

connect(fileList, SIGNAL(itemEntered(QListWidgetItem *)),

this, SLOT(processItem(QListWidgetItem *)));

connect(fileList, SIGNAL(itemSelectionChanged()),

this, SLOT(enableDownloadButton()));

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)));

connect(progressDialog, SIGNAL(canceled()), this, SLOT(cancelDownload()));

connect(connectButton, SIGNAL(clicked()), this, SLOT(connectToFtpServer()));

connect(cdToParentButton, SIGNAL(clicked()), this, SLOT(cdToParent()));

connect(downloadButton, SIGNAL(clicked()), this, SLOT(downloadFile()));

connect(quitButton, SIGNAL(clicked()), this, SLOT(close()));

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QHBoxLayout *topLayout = new QHBoxLayout;

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topLayout->addWidget(ftpServerLabel);

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topLayout->addWidget(ftpServerLineEdit);

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topLayout->addWidget(cdToParentButton);

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QHBoxLayout *buttonLayout = new QHBoxLayout;

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buttonLayout->addStretch(1);

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buttonLayout->addWidget(downloadButton);

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buttonLayout->addWidget(connectButton);

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buttonLayout->addWidget(quitButton);

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QVBoxLayout *mainLayout = new QVBoxLayout;

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mainLayout->addLayout(topLayout);

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mainLayout->addWidget(fileList);

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mainLayout->addWidget(statusLabel);

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mainLayout->addLayout(buttonLayout);

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setLayout(mainLayout);

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setWindowTitle(tr("FTP"));

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}

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void FtpWindow::connectToFtpServer()

122

{

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QApplication::setOverrideCursor(Qt::WaitCursor);

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ftp->connectToHost(ftpServerLineEdit->text());

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ftp->login();

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ftp->list();

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statusLabel->setText(tr("Connecting to FTP server %1...")

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.arg(ftpServerLineEdit->text()));

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}

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void FtpWindow::downloadFile()

132

{

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QString fileName = fileList->currentItem()->text();

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if (QFile::exists(fileName)) {

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QMessageBox::information(this, tr("FTP"),

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tr("There already exists a file called %1 in "

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"the current directory.")

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.arg(fileName));

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return;

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}

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file = new QFile(fileName);

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if (!file->open(QIODevice::WriteOnly)) {

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QMessageBox::information(this, tr("FTP"),

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tr("Unable to save the file %1: %2.")

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.arg(fileName).arg(file->errorString()));

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delete file;

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return;

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}

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

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progressDialog->setLabelText(tr("Downloading %1...").arg(fileName));

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progressDialog->show();

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downloadButton->setEnabled(false);

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}

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void FtpWindow::cancelDownload()

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{

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ftp->abort();

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}

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void FtpWindow::ftpCommandFinished(int, bool error)

165

{

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if (ftp->currentCommand() == QFtp::ConnectToHost) {

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if (error) {

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QApplication::restoreOverrideCursor();

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QMessageBox::information(this, tr("FTP"),

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tr("Unable to connect to the FTP server "

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"at %1. Please check that the host "

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"name is correct.")

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.arg(ftpServerLineEdit->text()));

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return;

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}

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statusLabel->setText(tr("Logged onto %1.")

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.arg(ftpServerLineEdit->text()));

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fileList->setFocus();

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connectButton->setEnabled(false);

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downloadButton->setDefault(true);

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return;

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}

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if (ftp->currentCommand() == QFtp::Get) {

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QApplication::restoreOverrideCursor();

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if (error) {

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statusLabel->setText(tr("Canceled download of %1.")

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.arg(file->fileName()));

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file->close();

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file->remove();

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} else {

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statusLabel->setText(tr("Downloaded %1 to current directory.")

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.arg(file->fileName()));

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file->close();

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}

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delete file;

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enableDownloadButton();

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} else if (ftp->currentCommand() == QFtp::List) {

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QApplication::restoreOverrideCursor();

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if (isDirectory.isEmpty()) {

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fileList->addItem(tr("<empty>"));

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fileList->setEnabled(false);

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}

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}

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}

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void FtpWindow::addToList(const QUrlInfo &urlInfo)

209

{

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QListWidgetItem *item = new QListWidgetItem;

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item->setText(urlInfo.name());

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QPixmap pixmap(urlInfo.isDir() ? ":/images/dir.png" : ":/images/file.png");

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item->setIcon(pixmap);

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isDirectory[urlInfo.name()] = urlInfo.isDir();

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fileList->addItem(item);

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if (!fileList->currentItem()) {

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fileList->setCurrentItem(fileList->item(0));

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fileList->setEnabled(true);

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}

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}

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void FtpWindow::processItem(QListWidgetItem *item)

224

{

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QString name = item->text();

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if (isDirectory.value(name)) {

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fileList->clear();

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isDirectory.clear();

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currentPath += "/" + name;

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ftp->cd(name);

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ftp->list();

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cdToParentButton->setEnabled(true);

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QApplication::setOverrideCursor(Qt::WaitCursor);

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return;

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}

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}

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void FtpWindow::cdToParent()

239

{

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QApplication::setOverrideCursor(Qt::WaitCursor);

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fileList->clear();

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isDirectory.clear();

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currentPath = currentPath.left(currentPath.lastIndexOf('/'));

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if (currentPath.isEmpty()) {

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cdToParentButton->setEnabled(false);

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ftp->cd("/");

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} else {

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ftp->cd(currentPath);

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}

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ftp->list();

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}

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void FtpWindow::updateDataTransferProgress(qint64 readBytes,

254

qint64 totalBytes)

255

{

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progressDialog->setMaximum(totalBytes);

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progressDialog->setValue(readBytes);

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}

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void FtpWindow::enableConnectButton()

261

{

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connectButton->setEnabled(!ftpServerLineEdit->text().isEmpty());

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}

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void FtpWindow::enableDownloadButton()

266

{

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QListWidgetItem *current = fileList->currentItem();

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if (current) {

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QString currentFile = current->text();

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downloadButton->setEnabled(!isDirectory.value(currentFile));

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} else {

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downloadButton->setEnabled(false);

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}

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}</pre>

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