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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">httpwindow.cpp Example File<br /><small><small>network/http/httpwindow.cpp</small></small></h1>

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

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

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** 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

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** 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 "httpwindow.h"

HttpWindow::HttpWindow(QWidget *parent)

: QDialog(parent)

{

urlLineEdit = new QLineEdit("http://www.ietf.org/iesg/1rfc_index.txt");

urlLabel = new QLabel(tr("&URL:"));

urlLabel->setBuddy(urlLineEdit);

statusLabel = new QLabel(tr("Please enter the URL of a file you want to "

"download."));

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

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

downloadButton->setDefault(true);

progressDialog = new QProgressDialog(this);

http = new QHttp(this);

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

this, SLOT(enableDownloadButton()));

connect(http, SIGNAL(requestFinished(int, bool)),

this, SLOT(httpRequestFinished(int, bool)));

connect(http, SIGNAL(dataReadProgress(int, int)),

this, SLOT(updateDataReadProgress(int, int)));

connect(http, SIGNAL(responseHeaderReceived(const QHttpResponseHeader &)),

this, SLOT(readResponseHeader(const QHttpResponseHeader &)));

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

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

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

QHBoxLayout *topLayout = new QHBoxLayout;

topLayout->addWidget(urlLabel);

topLayout->addWidget(urlLineEdit);

QHBoxLayout *buttonLayout = new QHBoxLayout;

buttonLayout->addStretch(1);

buttonLayout->addWidget(downloadButton);

buttonLayout->addWidget(quitButton);

QVBoxLayout *mainLayout = new QVBoxLayout;

mainLayout->addLayout(topLayout);

mainLayout->addWidget(statusLabel);

mainLayout->addLayout(buttonLayout);

setLayout(mainLayout);

setWindowTitle(tr("HTTP"));

urlLineEdit->setFocus();

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}

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void HttpWindow::downloadFile()

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{

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QUrl url(urlLineEdit->text());

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QFileInfo fileInfo(url.path());

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QString fileName = fileInfo.fileName();

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if (QFile::exists(fileName)) {

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

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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("HTTP"),

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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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file = 0;

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return;

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}

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http->setHost(url.host(), url.port() != -1 ? url.port() : 80);

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if (!url.userName().isEmpty())

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http->setUser(url.userName(), url.password());

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httpRequestAborted = false;

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httpGetId = http->get(url.path(), file);

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progressDialog->setWindowTitle(tr("HTTP"));

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

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downloadButton->setEnabled(false);

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}

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void HttpWindow::cancelDownload()

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{

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statusLabel->setText(tr("Download canceled."));

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httpRequestAborted = true;

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http->abort();

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downloadButton->setEnabled(true);

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}

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void HttpWindow::httpRequestFinished(int requestId, bool error)

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{

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if (httpRequestAborted) {

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if (file) {

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file->close();

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file->remove();

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delete file;

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file = 0;

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}

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progressDialog->hide();

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return;

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}

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if (requestId != httpGetId)

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return;

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progressDialog->hide();

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file->close();

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if (error) {

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file->remove();

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

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tr("Download failed: %1.")

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.arg(http->errorString()));

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} else {

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QString fileName = QFileInfo(QUrl(urlLineEdit->text()).path()).fileName();

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

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}

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downloadButton->setEnabled(true);

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delete file;

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file = 0;

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}

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void HttpWindow::readResponseHeader(const QHttpResponseHeader &responseHeader)

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{

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if (responseHeader.statusCode() != 200) {

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

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tr("Download failed: %1.")

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.arg(responseHeader.reasonPhrase()));

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httpRequestAborted = true;

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progressDialog->hide();

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http->abort();

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return;

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}

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}

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void HttpWindow::updateDataReadProgress(int bytesRead, int totalBytes)

195

{

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if (httpRequestAborted)

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return;

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progressDialog->setMaximum(totalBytes);

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progressDialog->setValue(bytesRead);

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}

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void HttpWindow::enableDownloadButton()

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{

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downloadButton->setEnabled(!urlLineEdit->text().isEmpty());

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}</pre>

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