I have been trying this whole day with no success. Please help in solving the issue. On googling I found many users had this issue but nowhere I could find a solution.

I am trying to do HTTP post in QT C++ & I have already tried doing that in python (My question is not a python question, so Qt pros please help).. I know, I am somewhere wrong in handling cookies and all, so please help. Please provide probable solutions.

In python, code is clean and simple. I have stripped error handling and all extra things to make it simple.

Qt Code: 
  1. url = 'http://www.example.com/'
  2. data = 'username=abc&password=passwd'
  3. cj = cookielib.CookieJar()
  4. opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
  5. usock = opener.open(url, data)
  6. #>>>>>> NOW, I have the cookiejar <<<<<<<<<
  7.  
  8. opener.addheaders = [('Referer','http://www.example.com/xyz.php'),('User-Agent','Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.3) Gecko/20091020 Ubuntu/9.10 (karmic) Firefox/3.5.3 GTB7.0')]
  9. data_to_send = 'ABCDEFGH'
  10. url_send = "http://www.example.com/xyz.php"
  11. send = opener.open(url_send,data_to_send)
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The Qt equivalent:-

Qt Code: 
  1. void SmsSender::sendToMyCantos()
  2. {
  3.     manager = new QNetworkAccessManager(this);
  4.     manager->setCookieJar(new QNetworkCookieJar(manager));
  5.     connect(manager,SIGNAL(finished(QNetworkReply*)),this,SLOT(replyFinished(QNetworkReply*)));
  6.     request.setUrl(QUrl("http://www.mycantos.com"));
  7.     postData.append("username=abc&password=passwd");
  8.     manager->post(request,postData);
  9.     //>>>>>> So, I feel that I have CookieJar now to make POST <<<<<<<
  10.  
  11.     request.setRawHeader("Referer","http://www.example.com/xyz.php");
  12.     request.setRawHeader("User-Agent","Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.3) Gecko/20091020 Ubuntu/9.10 (karmic) Firefox/3.5.3 GTB7.0");
  13.  
  14.     postData.clear();
  15.     postData.append("ABCDEFGH");
  16.     request.setUrl(QUrl("http://www.example.com/xyz.php"));
  17.  
  18.     manager->post(request,postData);
  19. }
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Now the issue is that I am not able to do the same in QT. Problems I am facing:

  1. Handling cookies
  2. Handling redirects (HTTP 302)
  3. Retaining cookies to make future POST

All this is done automagically in python. Below, the code is not directly related, but I coded this to allow redirects in the POST.. The code is very similar to the link I used to make it..

Qt Code: 
  1. QUrl SmsSender::redirectUrl(const QUrl& possibleRedirectUrl,
  2.                                const QUrl& oldRedirectUrl) const {
  3.         //Checking infinite resursions
  4.         QUrl redirectUrl;
  5.         if(!possibleRedirectUrl.isEmpty() &&
  6.            possibleRedirectUrl != oldRedirectUrl) {
  7.                 redirectUrl = possibleRedirectUrl;
  8.         }
  9.         return redirectUrl;
  10. }
  11.  
  12. void SmsSender::replyFinished(QNetworkReply *reply)
  13. {
  14.     QVariant possibleRedirectUrl =
  15.              reply->attribute(QNetworkRequest::RedirectionTargetAttribute);
  16.     QVariant data_size = reply->header(QNetworkRequest::ContentLengthHeader);
  17.     qDebug()<<data_size.toFloat();
  18.     qDebug()<<manager->cookieJar()->cookiesForUrl(QUrl("http://www.example.com"));
  19.  
  20.     /* We'll deduct if the redirection is valid in the redirectUrl function */
  21.     _urlRedirectedTo = this->redirectUrl(possibleRedirectUrl.toUrl(),
  22.                                          _urlRedirectedTo);
  23.  
  24.     /* If the URL is not empty, we're being redirected. */
  25.     if(!_urlRedirectedTo.isEmpty()) {
  26.             QString text = QString("SmsSender::replyFinished: Redirected to ")
  27.                                   .append(_urlRedirectedTo.toString());
  28.     qDebug(text.toAscii());
  29.  
  30.     // Do again in case we have more redirections
  31.  
  32.     this->_qnam->get(QNetworkRequest(_urlRedirectedTo));
  33.     }
  34.     else
  35.     {
  36.         QString text = QString("SmsSender::replyFinished: Arrived to ")
  37.                                   .append(reply->url().toString());
  38.         qDebug(text.toAscii());
  39.         _urlRedirectedTo.clear();
  40.     }
  41.  
  42. }
  43.  
  44. QNetworkAccessManager* SmsSender::createQNAM() {
  45.         QNetworkAccessManager* qnam = new QNetworkAccessManager(this);
  46.         /* We'll handle the finished reply in replyFinished */
  47.         connect(qnam, SIGNAL(finished(QNetworkReply*)),
  48.                 this, SLOT(replyFinished(QNetworkReply*)));
  49.         return qnam;
  50. }
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