Reqest and Response in XML

[srohit24]

I getting "Unknown error" as the output for the error string, when i use it in the fetch function

But when i use it in the finished function, am getting "Authentication required".

But i am passing the username and password in the variable converted under http.setUser.

any ideas as to what might be the problem??

[wysota]

Use a network sniffer to see how your request looks like when it leaves your network interface. See if the proper auth data is contained in the http request.

[srohit24]

i used the network sniffer

here is what i got, in packets

[B]HOST[/B]
 
.à ügÇT.¡„Ï3ˆd.>
/.!E.
-ú@.€JT;\*I®…R\.P²4Þ¼*·}ÓPÿÿ)¥..POST /api/ HTTP/1.1
Connection: Keep-Alive
Host: ionlab.webfactional.com
content-length: 162
 
<request version="0.1" >
 <call name="teci.client.create" >
  <client>
   <kind>MOBILE</kind>
   <name>API Test suite 7936</name>
  </client>
 </call>
</request>
 
 
[B]SERVER[/B]
 
.¡„Ï3.à ügÇTˆd.>
D.!E.
B“i@.6Ю…R;\*I.P\*·}Ó²4ßÁP Z..HTTP/1.1 401 Authorization Required
Server: nginx
Date: Thu, 02 Jul 2009 14:41:37 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Cookie
WWW-Authenticate: Basic realm="TrackEveryCoin API"
 
16
Authorization Required
0
 
[B]HOST[/B]
 
.à ügÇT.¡„Ï3ˆd.>
Å .!E.
ˆÿ@.€Iô;\*I®…R\.P²4ßÁ*·~Ã*Pþå¾I..POST /api/ HTTP/1.1
Connection: Keep-Alive
Host: ionlab.webfactional.com
content-length: 162
Authorization: Basic QXV0aG9yaXphdGlvbiA6IGMzSnZhR2wwTWpSQVoyMWhhV3d1WTI5dE9qRXlNelExOg==
 
<request version="0.1" >
 <call name="teci.client.create" >
  <client>
  <kind>MOBILE</kind>
   <name>API Test suite 7936</name>
  </client>
 </call>
</request>
 
 
[B]SERVER[/B]
 
.¡„Ï3.à ügÇTˆd.>
D.!E.
B“j@.6Ï®…R;\*I.P\*·~Ã*²4á!PPSk..HTTP/1.1 401 Authorization Required
Server: nginx
Date: Thu, 02 Jul 2009 14:41:37 GMT
Content-Type: text/html; charset=ut-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Cookie
WWW-Authenticate: Basic realm="TrackEveryCoin API"
 
16
Authorization Required
0

[B]HOST[/B]

.à ügÇT.¡„Ï3ˆd.>
/.!E.
-ú@.€JT;\*I®…R\.P²4Þ¼*·}ÓPÿÿ)¥..POST /api/ HTTP/1.1
Connection: Keep-Alive
Host: ionlab.webfactional.com
content-length: 162

<request version="0.1" >
 <call name="teci.client.create" >
  <client>
   <kind>MOBILE</kind>
   <name>API Test suite 7936</name>
  </client>
 </call>
</request>


[B]SERVER[/B]

.¡„Ï3.à ügÇTˆd.>
D.!E.
B“i@.6Ю…R;\*I.P\*·}Ó²4ßÁP Z..HTTP/1.1 401 Authorization Required
Server: nginx
Date: Thu, 02 Jul 2009 14:41:37 GMT
Content-Type: text/html; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Cookie
WWW-Authenticate: Basic realm="TrackEveryCoin API"

16
Authorization Required
0

[B]HOST[/B]

.à ügÇT.¡„Ï3ˆd.>
Å .!E.
ˆÿ@.€Iô;\*I®…R\.P²4ßÁ*·~Ã*Pþå¾I..POST /api/ HTTP/1.1
Connection: Keep-Alive
Host: ionlab.webfactional.com
content-length: 162
Authorization: Basic QXV0aG9yaXphdGlvbiA6IGMzSnZhR2wwTWpSQVoyMWhhV3d1WTI5dE9qRXlNelExOg==

<request version="0.1" >
 <call name="teci.client.create" >
  <client>
  <kind>MOBILE</kind>
   <name>API Test suite 7936</name>
  </client>
 </call>
</request>


[B]SERVER[/B]

.¡„Ï3.à ügÇTˆd.>
D.!E.
B“j@.6Ï®…R;\*I.P\*·~Ã*²4á!PPSk..HTTP/1.1 401 Authorization Required
Server: nginx
Date: Thu, 02 Jul 2009 14:41:37 GMT
Content-Type: text/html; charset=ut-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Cookie
WWW-Authenticate: Basic realm="TrackEveryCoin API"

16
Authorization Required
0

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Before the complete data is being sent, i am getting the authentication required error

[wysota]

You are not sending the authentication data. Make sure you use setUser() early enough in the flow. Also consider switching from QHttp to QNetworkAccessManager, it's easier to use it.

[srohit24]

i got it working mate. thanks for ur help

here is the code that works

void RSSListing::fetch()
 {
     lineEdit->setReadOnly(true);
     fetchButton->setEnabled(false);
     abortButton->setEnabled(true);
     treeWidget->clear();
     xml.clear();
 
     QByteArray string ("username");
     string.append(":");
     string.append("12345");
     QString encoded = string.toBase64();
     qDebug() <<"String"<< string <<"Encoded" <<encoded ;
 
     QUrl url("something/api/");
     url.setUserName("username");
     url.setPassword("12345");
 
     QHttpRequestHeader header("POST","/api/");
     header.setValue("Host",url.host());
     header.setValue("Path",url.path());
     header.setValue("Authorization","Basic " + encoded);
 
     http.setHost(url.host(),url.port(80));
 
     sendrequest();
     connectionId = http.request(header,xmlrequest);
 }

void RSSListing::fetch()
 {
     lineEdit->setReadOnly(true);
     fetchButton->setEnabled(false);
     abortButton->setEnabled(true);
     treeWidget->clear();
     xml.clear();

     QByteArray string ("username");
     string.append(":");
     string.append("12345");
     QString encoded = string.toBase64();
     qDebug() <<"String"<< string <<"Encoded" <<encoded ;

     QUrl url("something/api/");
     url.setUserName("username");
     url.setPassword("12345");

     QHttpRequestHeader header("POST","/api/");
     header.setValue("Host",url.host());
     header.setValue("Path",url.path());
     header.setValue("Authorization","Basic " + encoded);

     http.setHost(url.host(),url.port(80));

     sendrequest();
     connectionId = http.request(header,xmlrequest);
 }

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I am getting the response as per the specifications.

While parsing, is it possible to go to a particular tag, say skip the 1st 3 tags and go directly to the 4th one?

The first few tags in the response is redundant, i dont want to waste time parsing through them.

thanks

[srohit24]

My parsing code is this.

void MainWindow::parseXml()
 {
 
    while (!xml.atEnd())
     {
         xml.readNext();
 
         if (xml.isStartElement())
         {
             currentTag = xml.name().toString();
             qDebug() << "Current tag"<< currentTag ;
 
         }
         else if (xml.isEndElement())
         {
             if (xml.name() == "response")
             {
 
                 QTreeWidgetItem *item = new QTreeWidgetItem;
                 item->setText(0, titleString);
                 item->setText(1, linkString);
                 treeWidget->addTopLevelItem(item);
 
                 titleString.clear();
                 linkString.clear();
             }
 
         }
         else if (xml.isCharacters() && !xml.isWhitespace())
         {
             if (currentTag == "client")
                 titleString += xml.attributes().value("id").toString();
             else if (currentTag == "serial_number")
                 linkString += xml.text().toString();
         }
     }
     if (xml.error() && xml.error() != QXmlStreamReader::PrematureEndOfDocumentError) {
         qWarning() << "XML ERROR:" << xml.lineNumber() << ": " << xml.errorString();
         http.abort();
     }
 }

void MainWindow::parseXml()
 {

    while (!xml.atEnd())
     {
         xml.readNext();

         if (xml.isStartElement())
         {
             currentTag = xml.name().toString();
             qDebug() << "Current tag"<< currentTag ;

         }
         else if (xml.isEndElement())
         {
             if (xml.name() == "response")
             {

                 QTreeWidgetItem *item = new QTreeWidgetItem;
                 item->setText(0, titleString);
                 item->setText(1, linkString);
                 treeWidget->addTopLevelItem(item);

                 titleString.clear();
                 linkString.clear();
             }

         }
         else if (xml.isCharacters() && !xml.isWhitespace())
         {
             if (currentTag == "client")
                 titleString += xml.attributes().value("id").toString();
             else if (currentTag == "serial_number")
                 linkString += xml.text().toString();
         }
     }
     if (xml.error() && xml.error() != QXmlStreamReader::PrematureEndOfDocumentError) {
         qWarning() << "XML ERROR:" << xml.lineNumber() << ": " << xml.errorString();
         http.abort();
     }
 }

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<response version="0.1">
  <client id="1">
    <name>API Test suite 7936</name>
    <kind>MOBILE</kind>
    <serial_number>a09b4d3b-08b7-4cdf-bf3c-a5a8fb27ee1f</serial_number>
    <added_on>2009-06-25 12:33:49.182287</added_on>
    <enabled>True</enabled>
  </client>
</response>

<response version="0.1">
  <client id="1">
    <name>API Test suite 7936</name>
    <kind>MOBILE</kind>
    <serial_number>a09b4d3b-08b7-4cdf-bf3c-a5a8fb27ee1f</serial_number>
    <added_on>2009-06-25 12:33:49.182287</added_on>
    <enabled>True</enabled>
  </client>
</response>

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I am able to get the serial no from the response, but to get the value of id in client tag is proving hard.

how can i get the value from a attribute and convert it into string??

[wysota]

See QXmlStreamReader::attributes() and QXmlStreamAttributes::value().

[srohit24]

thanks mate.

I was trying to find the tag when it was already parsed. Fixed it. working now.

Can you tell me a method through which i can go directly to a particular tag in the QXMLStreamHeader??

I want to skip the 1st 3 tags and go directly to the 4th one.

[wysota]

Consider using QDomDocument instead of the stream reader. It is easier to manipulate the xml there.