QNetworkCookieJar::allCookies() const is protected

[svello]

Hi all,
this is my first post on the forum and in these days are started my journeys in c++ and qt4.

My problem is with this line of code:

QList<QNetworkCookie> cookiesList(cookieJar->allCookies());

QList<QNetworkCookie> cookiesList(cookieJar->allCookies());

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which gives the following error during make:

/usr/include/qt4/QtNetwork/qnetworkcookie.h: In member function ‘void HttpWindow::replyFinished(QNetworkReply*)’:
/usr/include/qt4/QtNetwork/qnetworkcookie.h:121: error: ‘QList<QNetworkCookie> QNetworkCookieJar::allCookies() const’ is protected

Maybe this is c++ matter than qt4; since QNetworkCookieJar::allCookies() is protected how assign its value to my cookiesList?

Thanks

[wysota]

You have to use QNetworkCookieJar::setCookiesFromUrl(). The method you mentioned is useful if you're implementing your own cookie jar and want to save cookies across sessions.

[svello]

Probably my first post was incomplete.

From the beginning: my application needs to login in a site and execute some opertations; so I have to store cookies:

manager = new QNetworkAccessManager;
connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
 
cookieJar = new QNetworkCookieJar;
manager->setCookieJar(cookieJar);

manager = new QNetworkAccessManager;
connect(manager, SIGNAL(finished(QNetworkReply*)), this, SLOT(replyFinished(QNetworkReply*)));
	
cookieJar = new QNetworkCookieJar;
manager->setCookieJar(cookieJar);

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I thought that once called manager->post(...) all cookies from website were stored in cookieJar so with cookieJar->allCookies() I could check them and, yes, reuse cookieJar for next operations in the site.

[wysota]

You have to store them yourself in the cookie jar, as far as I remember.

[svello]

You have to store them yourself in the cookie jar, as far as I remember.

And from where, since QNetworkReply seems not have any function related to cookies. Sorry wysota, but network argument is very tough in the documentation.

thanks

[wysota]

And from where, since QNetworkReply seems not have any function related to cookies.

Sure it does - QNetworkReply::header() with QNetworkRequest::SetCookieHeader.

[svello]

Sure it does - QNetworkReply::header() with QNetworkRequest::SetCookieHeader.

Now the only problem is converting a QVariant in QList<QNetworkCookie>.

I've tryed this

QList<QNetworkCookie> cookiesList(reply->header(QNetworkRequest::SetCookieHeader).toList());

QList<QNetworkCookie> cookiesList(reply->header(QNetworkRequest::SetCookieHeader).toList());

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with no luck. It creates a QList<QVariant> and can't be used for cookiesList. Any tips?

[wysota]

QList<QNetworkCookie> cookiesList = qvariant_cast<QList<QNetworkCookie> >(reply->header(...));

QList<QNetworkCookie> cookiesList = qvariant_cast<QList<QNetworkCookie> >(reply->header(...));

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[svello]

QList<QNetworkCookie> cookiesList = qvariant_cast<QList<QNetworkCookie> >(reply->header(...));

QList<QNetworkCookie> cookiesList = qvariant_cast<QList<QNetworkCookie> >(reply->header(...));

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Thanks wysota, now it compiles correctly but as result I got an empty cookiesList; it is how no cookies were sent by the website. I have made a minimal example for testing purpose; have added a webview for checking site message and it says "Cookies are not enabled!":

#include <QApplication>
#include <QtGui>
#include <QtNetwork>
#include <QtWebKit>
 
class CookiesTest : public QDialog
{
	Q_OBJECT
	public:
		CookiesTest(QWidget* parent = 0);
 
	private slots:
		void replyFinished(QNetworkReply*);
 
	private:
		QWebView* webView;
		QLabel* label;
		QNetworkAccessManager* manager;
};
 
CookiesTest::CookiesTest(QWidget* parent)
: QDialog(parent)
{
	resize(640,480);
 
	webView = new QWebView;  // web page error messages
	label = new QLabel;   // displays num of cookies received
	QVBoxLayout* layout = new QVBoxLayout(this);
	layout->addWidget(webView);
	layout->addWidget(label);
 
	manager = new QNetworkAccessManager;
	connect(manager, SIGNAL(finished(QNetworkReply*)),
			this, SLOT(replyFinished(QNetworkReply*)));
 
	manager->get(QNetworkRequest(QUrl("http://www.tempesttech.com/cookies/cookietest2.asp")));
}
 
void CookiesTest::replyFinished(QNetworkReply* reply)
{
	qDebug() << "Num of cookies: "
			 << reply->header(QNetworkRequest::SetCookieHeader).toList().size();
	label->setText("Num of cookies: "
		+ QVariant(reply->header(QNetworkRequest::SetCookieHeader).toList().size()).toString());
	webView->setContent(reply->readAll());
}
 
 
int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	CookiesTest cookiesTest;
	cookiesTest.exec();
}
 
#include "main.moc"

#include <QApplication>
#include <QtGui>
#include <QtNetwork>
#include <QtWebKit>

class CookiesTest : public QDialog
{
	Q_OBJECT
	public:
		CookiesTest(QWidget* parent = 0);

	private slots:
		void replyFinished(QNetworkReply*);

	private:
		QWebView* webView;
		QLabel* label;
		QNetworkAccessManager* manager;
};

CookiesTest::CookiesTest(QWidget* parent)
: QDialog(parent)
{
	resize(640,480);
	
	webView = new QWebView;  // web page error messages
	label = new QLabel;   // displays num of cookies received
	QVBoxLayout* layout = new QVBoxLayout(this);
	layout->addWidget(webView);
	layout->addWidget(label);
	
	manager = new QNetworkAccessManager;
	connect(manager, SIGNAL(finished(QNetworkReply*)),
			this, SLOT(replyFinished(QNetworkReply*)));
	
	manager->get(QNetworkRequest(QUrl("http://www.tempesttech.com/cookies/cookietest2.asp")));
}

void CookiesTest::replyFinished(QNetworkReply* reply)
{
	qDebug() << "Num of cookies: "
			 << reply->header(QNetworkRequest::SetCookieHeader).toList().size();
	label->setText("Num of cookies: "
		+ QVariant(reply->header(QNetworkRequest::SetCookieHeader).toList().size()).toString());
	webView->setContent(reply->readAll());
}


int main(int argc, char* argv[])
{
	QApplication app(argc, argv);
	CookiesTest cookiesTest;
	cookiesTest.exec();
}

#include "main.moc"

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What am I doing wrong?

[wysota]

Did the website send you any cookies? Can you verify that with a network sniffer?

[svello]

Did the website send you any cookies? Can you verify that with a network sniffer?

Ok, solved! The problem was the wrong url; the right url for testing cookie ability is

http://www.tempesttech.com/cookies/cookietest1.asp

this link sets the cookie while that in my previous post checks only if it exists.

Many thanks, wysota.

[rexi]

Maybe this is c++ matter than qt4; since QNetworkCookieJar::allCookies() is protected

Just for the record, to explain some basics of object orientation: Yes, this is a C++ matter. "protected" means that you can access this method only in classes derived from QNetworkCookieJar. "protected" methods are hidden, and thus, not accessible, from any other classes.