Sprawdzałem działanie na przykładowym programie, który jest już w bilbiotece qt:
httpwindow.h
#ifndef HTTPWINDOW_H
#define HTTPWINDOW_H
#include
QT_BEGIN_NAMESPACE
class QDialogButtonBox;
class QFile;
class QHttp;
class QHttpResponseHeader;
class QLabel;
class QLineEdit;
class QProgressDialog;
class QPushButton;
class QSslError;
class QAuthenticator;
QT_END_NAMESPACE
class HttpWindow : public QDialog
{
Q_OBJECT
public:
HttpWindow(QWidget *parent = 0);
private slots:
void downloadFile();
void cancelDownload();
void httpRequestFinished(int requestId, bool error);
void readResponseHeader(const QHttpResponseHeader &responseHeader);
void updateDataReadProgress(int bytesRead, int totalBytes);
void enableDownloadButton();
void slotAuthenticationRequired(const QString &, quint16, QAuthenticator *);
#ifndef QT_NO_OPENSSL
void sslErrors(const QList &errors);
#endif
private:
QLabel *statusLabel;
QLabel *urlLabel;
QLineEdit *urlLineEdit;
QProgressDialog *progressDialog;
QPushButton *downloadButton;
QPushButton *quitButton;
QDialogButtonBox *buttonBox;
QHttp *http;
QFile *file;
int httpGetId;
bool httpRequestAborted;
};
#endif
httpwindow.cpp:
#include
#include
#include "httpwindow.h"
#include "ui_authenticationdialog.h"
HttpWindow::HttpWindow(QWidget *parent)
: QDialog(parent)
{
#ifndef QT_NO_OPENSSL
urlLineEdit = new QLineEdit("https://");
#else
urlLineEdit = new QLineEdit("http://");
#endif
urlLabel = new QLabel(tr("&URL:"));
urlLabel->setBuddy(urlLineEdit);
statusLabel = new QLabel(tr("Please enter the URL of a file you want to "
"download."));
downloadButton = new QPushButton(tr("Download"));
downloadButton->setDefault(true);
quitButton = new QPushButton(tr("Quit"));
quitButton->setAutoDefault(false);
buttonBox = new QDialogButtonBox;
buttonBox->addButton(downloadButton, QDialogButtonBox::ActionRole);
buttonBox->addButton(quitButton, QDialogButtonBox::RejectRole);
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(http, SIGNAL(authenticationRequired(const QString &, quint16, QAuthenticator *)),
this, SLOT(slotAuthenticationRequired(const QString &, quint16, QAuthenticator *)));
#ifndef QT_NO_OPENSSL
connect(http, SIGNAL(sslErrors(const QList &)),
this, SLOT(sslErrors(const QList &)));
#endif
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);
QVBoxLayout *mainLayout = new QVBoxLayout;
mainLayout->addLayout(topLayout);
mainLayout->addWidget(statusLabel);
mainLayout->addWidget(buttonBox);
setLayout(mainLayout);
setWindowTitle(tr("HTTP"));
urlLineEdit->setFocus();
}
void HttpWindow::downloadFile()
{
QUrl url(urlLineEdit->text());
QFileInfo fileInfo(url.path());
QString fileName = fileInfo.fileName();
if (fileName.isEmpty())
fileName = "index.html";
if (QFile::exists(fileName)) {
if (QMessageBox::question(this, tr("HTTP"),
tr("There already exists a file called %1 in "
"the current directory. Overwrite?").arg(fileName),
QMessageBox::Ok|QMessageBox::Cancel, QMessageBox::Cancel)
== QMessageBox::Cancel)
return;
QFile::remove(fileName);
}
file = new QFile(fileName);
if (!file->open(QIODevice::WriteOnly)) {
QMessageBox::information(this, tr("HTTP"),
tr("Unable to save the file %1: %2.")
.arg(fileName).arg(file->errorString()));
delete file;
file = 0;
return;
}
QHttp::ConnectionMode mode = url.scheme().toLower() == "https" ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;
http->setHost(url.host(), mode, url.port() == -1 ? 0 : url.port());
if (!url.userName().isEmpty())
http->setUser(url.userName(), url.password());
httpRequestAborted = false;
QByteArray path = QUrl::toPercentEncoding(url.path(), "!$&'()*+,;=:@/");
if (path.isEmpty())
path = "/";
httpGetId = http->get(path, file);
progressDialog->setWindowTitle(tr("HTTP"));
progressDialog->setLabelText(tr("Downloading %1.").arg(fileName));
downloadButton->setEnabled(false);
}
void HttpWindow::cancelDownload()
{
statusLabel->setText(tr("Download canceled."));
httpRequestAborted = true;
http->abort();
downloadButton->setEnabled(true);
}
void HttpWindow::httpRequestFinished(int requestId, bool error)
{
if (requestId != httpGetId)
return;
if (httpRequestAborted) {
if (file) {
file->close();
file->remove();
delete file;
file = 0;
}
progressDialog->hide();
return;
}
if (requestId != httpGetId)
return;
progressDialog->hide();
file->close();
if (error) {
file->remove();
QMessageBox::information(this, tr("HTTP"),
tr("Download failed: %1.")
.arg(http->errorString()));
} else {
QString fileName = QFileInfo(QUrl(urlLineEdit->text()).path()).fileName();
statusLabel->setText(tr("Downloaded %1 to current directory.").arg(fileName));
}
downloadButton->setEnabled(true);
delete file;
file = 0;
}
void HttpWindow::readResponseHeader(const QHttpResponseHeader &responseHeader)
{
switch (responseHeader.statusCode()) {
case 200: // Ok
case 301: // Moved Permanently
case 302: // Found
case 303: // See Other
case 307: // Temporary Redirect
// these are not error conditions
break;
default:
QMessageBox::information(this, tr("HTTP"),
tr("Download failed: %1.")
.arg(responseHeader.reasonPhrase()));
httpRequestAborted = true;
progressDialog->hide();
http->abort();
}
}
void HttpWindow::updateDataReadProgress(int bytesRead, int totalBytes)
{
if (httpRequestAborted)
return;
progressDialog->setMaximum(totalBytes);
progressDialog->setValue(bytesRead);
}
void HttpWindow::enableDownloadButton()
{
downloadButton->setEnabled(!urlLineEdit->text().isEmpty());
}
void HttpWindow::slotAuthenticationRequired(const QString &hostName, quint16, QAuthenticator *authenticator)
{
QDialog dlg;
Ui::Dialog ui;
ui.setupUi(&dlg);
dlg.adjustSize();
ui.siteDescription->setText(tr("%1 at %2").arg(authenticator->realm()).arg(hostName));
if (dlg.exec() == QDialog::Accepted) {
authenticator->setUser(ui.userEdit->text());
authenticator->setPassword(ui.passwordEdit->text());
}
}
#ifndef QT_NO_OPENSSL
void HttpWindow::sslErrors(const QList &errors)
{
QString errorString;
foreach (const QSslError &error, errors) {
if (!errorString.isEmpty())
errorString += ", ";
errorString += error.errorString();
}
if (QMessageBox::warning(this, tr("HTTP Example"),
tr("One or more SSL errors has occurred: %1").arg(errorString),
QMessageBox::Ignore | QMessageBox::Abort) == QMessageBox::Ignore) {
http->ignoreSslErrors();
}
}
#endif
main.cpp:
#include
#include "httpwindow.h"
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
HttpWindow httpWin;
httpWin.show();
return httpWin.exec();
}
ui_authenticationdialog.h
#ifndef UI_AUTHENTICATIONDIALOG_H
#define UI_AUTHENTICATIONDIALOG_H
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
QT_BEGIN_NAMESPACE
class Ui_Dialog
{
public:
QGridLayout *gridLayout;
QLabel *label;
QLabel *label_2;
QLineEdit *userEdit;
QLabel *label_3;
QLineEdit *passwordEdit;
QDialogButtonBox *buttonBox;
QLabel *label_4;
QLabel *siteDescription;
QSpacerItem *spacerItem;
void setupUi(QDialog *Dialog)
{
if (Dialog->objectName().isEmpty())
Dialog->setObjectName(QString::fromUtf8("Dialog"));
Dialog->resize(389, 243);
gridLayout = new QGridLayout(Dialog);
gridLayout->setObjectName(QString::fromUtf8("gridLayout"));
label = new QLabel(Dialog);
label->setObjectName(QString::fromUtf8("label"));
label->setWordWrap(false);
gridLayout->addWidget(label, 0, 0, 1, 2);
label_2 = new QLabel(Dialog);
label_2->setObjectName(QString::fromUtf8("label_2"));
gridLayout->addWidget(label_2, 2, 0, 1, 1);
userEdit = new QLineEdit(Dialog);
userEdit->setObjectName(QString::fromUtf8("userEdit"));
gridLayout->addWidget(userEdit, 2, 1, 1, 1);
label_3 = new QLabel(Dialog);
label_3->setObjectName(QString::fromUtf8("label_3"));
gridLayout->addWidget(label_3, 3, 0, 1, 1);
passwordEdit = new QLineEdit(Dialog);
passwordEdit->setObjectName(QString::fromUtf8("passwordEdit"));
gridLayout->addWidget(passwordEdit, 3, 1, 1, 1);
buttonBox = new QDialogButtonBox(Dialog);
buttonBox->setObjectName(QString::fromUtf8("buttonBox"));
buttonBox->setOrientation(Qt::Horizontal);
buttonBox->setStandardButtons(QDialogButtonBox::Cancel|QDialogButtonBox::Ok);
gridLayout->addWidget(buttonBox, 5, 0, 1, 2);
label_4 = new QLabel(Dialog);
label_4->setObjectName(QString::fromUtf8("label_4"));
gridLayout->addWidget(label_4, 1, 0, 1, 1);
siteDescription = new QLabel(Dialog);
siteDescription->setObjectName(QString::fromUtf8("siteDescription"));
QFont font;
font.setBold(true);
font.setWeight(75);
siteDescription->setFont(font);
siteDescription->setWordWrap(true);
gridLayout->addWidget(siteDescription, 1, 1, 1, 1);
spacerItem = new QSpacerItem(20, 40, QSizePolicy::Minimum, QSizePolicy::Expanding);
gridLayout->addItem(spacerItem, 4, 0, 1, 1);
retranslateUi(Dialog);
QObject::connect(buttonBox, SIGNAL(accepted()), Dialog, SLOT(accept()));
QObject::connect(buttonBox, SIGNAL(rejected()), Dialog, SLOT(reject()));
QMetaObject::connectSlotsByName(Dialog);
} // setupUi
void retranslateUi(QDialog *Dialog)
{
Dialog->setWindowTitle(QApplication::translate("Dialog", "Http authentication required", 0, QApplication::UnicodeUTF8));
label->setText(QApplication::translate("Dialog", "You need to supply a Username and a Password to access this site", 0, QApplication::UnicodeUTF8));
label_2->setText(QApplication::translate("Dialog", "Username:", 0, QApplication::UnicodeUTF8));
label_3->setText(QApplication::translate("Dialog", "Password:", 0, QApplication::UnicodeUTF8));
label_4->setText(QApplication::translate("Dialog", "Site:", 0, QApplication::UnicodeUTF8));
siteDescription->setText(QApplication::translate("Dialog", "%1 at %2", 0, QApplication::UnicodeUTF8));
Q_UNUSED(Dialog);
} // retranslateUi
};
namespace Ui {
class Dialog: public Ui_Dialog {};
} // namespace Ui
QT_END_NAMESPACE
#endif // UI_AUTHENTICATIONDIALOG_H