How to use http cookies with Qt

ps：以下文章中文部分为软件翻译的结果，看的时候请自行分析

How to use http cookies with Qt

Overview

原文：

A cookie, also known as a web cookie, browser cookie, and HTTP cookie, is a piece of text stored by a user's web browser. A cookie can be used for authentication, storing site preferences, shopping cart contents, the identifier for a server-based session,
or anything else that can be accomplished through storing text data.A cookie consists of one or more name-value pairs containing bits of information, which may be encrypted for information privacy and data security purposes. The cookie is sent as an HTTP header
by a web server to a web browser and then sent back unchanged by the browser each time it accesses that server.

翻译：

一cookie，也被称为一个Web浏览器的cookie，cookie和HTTP，是一块存储在用户浏览器的文本。Cookie可以用于认证，存储网站的喜好，购物车的内容，为基于服务器的会话标识符，或其他任何可以通过存储文本数据来完成的。一个cookie包含一个或多个名称-值对包含的信息，它可以被加密的信息隐私和数据安全的目的。Cookie是由Web服务器网页浏览器HTTP标头发送然后送回不变的浏览器，每次访问服务器。

Code

原文：

The Qt Network module offers the class QNetworkCookieJar which can be used with QNetworkAccessManager to manage cookies in Qt applications.The following class will show you how to send a post request to a URL and read the cookies stored in the header.

翻译：

QT网络模块提供的类qnetworkcookiejar可与qnetworkaccessmanager在Qt应用程序管理的cookies。下面的类将告诉你如何发送POST请求的URL和读取存储在头的cookie。

#ifndef COOKIESHANDLER_H
#define COOKIESHANDLER_H
#include <QObject>
#include <QtNetwork/QNetworkAccessManager>
#include <QtNetwork/QNetworkCookieJar>
#include <QtNetwork/QNetworkRequest>
#include <QtNetwork/QNetworkReply>
#include <QDebug>

class cookiesHandler: public QObject{
Q_OBJECT

public:
cookiesHandler(QObject *parent = 0) : QObject(parent){
mManager = new QNetworkAccessManager(this);
mManager->setCookieJar(new QNetworkCookieJar(this));
connect(mManager, SIGNAL(finished(QNetworkReply*)), SLOT(replyFinished(QNetworkReply*)));
}

void sendPostRequest(const QUrl &url, const QByteArray &data){
mUrl = url;
QNetworkRequest r(mUrl);
mManager->post(r, data);
}

virtual ~cookiesHandler(){}

private slots:
void replyFinished(QNetworkReply *reply){
if (reply->error() != QNetworkReply::NoError){
qWarning() << "ERROR:" << reply->errorString();
return;
}

QList<QNetworkCookie>  cookies = mManager->cookieJar()->cookiesForUrl(mUrl);
qDebug() << "COOKIES for" << mUrl.host() << cookies;
}

private:
QNetworkAccessManager *mManager;
QUrl mUrl;
};

#endif // COOKIESHANDLER_H

The previous class can be used as follow:

QUrl url("https://yourwebsite.com"); // https and http are both allowed.
QByteArray postData;
postData.append("username=myUsername&password=myPAss&hiddenFields=ifAny");
c.sendPostRequest(url, postData);

The cookie can be sent back to the server with another request in this way:

QList<QNetworkCookie>  cookies = mManager->cookieJar()->cookiesForUrl(mUrl);
QVariant var;
var.setValue(cookies);

QNetworkRequest r(QUrl("http://www.developer.nokia.com/Profile/"));
r.setHeader(QNetworkRequest::CookieHeader, var);
mManager->get(r);