XML parse

[arunredi]

Hello,

I'm trying to read all the values of a particular tag (in this case 'name') with in the xml file.
below is the actual xml file:

<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
<response>
 <status>ok</status>
 <project_list>
  <project>
   <id>1911</id>
   <url>http://www.snipitron.com/arun/Qt_code</url>
   <name>Qt code</name>
  </project>
  <project>
   <id>1902</id>
   <url>http://www.snipitron.com/arun/Mac_app</url>
   <name>Mac app</name>
  </project>
 </project_list>
</response>

<?xml version='1.0' encoding='UTF-8' standalone='yes'?>
<response>
 <status>ok</status>
 <project_list>
  <project>
   <id>1911</id>
   <url>http://www.snipitron.com/arun/Qt_code</url>
   <name>Qt code</name>
  </project>
  <project>
   <id>1902</id>
   <url>http://www.snipitron.com/arun/Mac_app</url>
   <name>Mac app</name>
  </project>
 </project_list>
</response>

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And i'm having the Qt code to read the name value as below:

if (docElement.tagName() == "response"){
		stat = docElement.firstChildElement("status").text();
		statMsg = docElement.firstChildElement("message").text();
		if (stat == "ok" ){
			projNameNode = docElement.elementsByTagName("name");
			for (uint j = 0; j < projNameNode.count(); j++)
				{
					nodeMsg = projNameNode.item(j).toElement().attribute("name"); 
					QMessageBox::critical(this, "Arun", nodeMsg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton);
 
				}
 
			}
		} else
		QMessageBox::critical(this, "Arun", "Status: " + stat + " Message: " + statMsg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton);
}

if (docElement.tagName() == "response"){
		stat = docElement.firstChildElement("status").text();
		statMsg = docElement.firstChildElement("message").text();
		if (stat == "ok" ){
			projNameNode = docElement.elementsByTagName("name");
			for (uint j = 0; j < projNameNode.count(); j++)
				{
					nodeMsg = projNameNode.item(j).toElement().attribute("name"); 
					QMessageBox::critical(this, "Arun", nodeMsg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton);

				}

			}
		} else
		QMessageBox::critical(this, "Arun", "Status: " + stat + " Message: " + statMsg, QMessageBox::Ok, QMessageBox::NoButton, QMessageBox::NoButton);
}

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I'm missing something here and hence i'm getting NULL as value for nodeMsg.

any help is greatly appreciated.

thanks,
Ar

[patrik08]

You must only iterate xml document ... this here is a rss sample ...

if you have qt4.4 learn http://doc.trolltech.com/4.4rc1/qxmlquery.html QXmlQuery
and make a query like a database...

typedef QMap<int, QStringList> RssParams;
 
/* read a static rss version 1/2 file and return QMap params of link title description */
RssParams ReadRssFile( QString fileplace , int limiter )
{
   RssParams contingent;
   QFile xmlfile( fileplace );
   QString errorStr, obname, inhalt;
   int errorLine, errorColumn, position;
   position = 0 -1;
   QDomDocument doc("RSS");
     if(!xmlfile.open( QIODevice::ReadOnly ) ) {
      return contingent;
     }
     if (!doc.setContent(&xmlfile,true, &errorStr, &errorLine, &errorColumn)) {
      xmlfile.close();
      return contingent; 
     }
    QDomElement root = doc.documentElement();
    QDomElement chanelbase = root.firstChildElement("channel");
    QDomElement child = chanelbase.firstChildElement("item");
        while (!child.isNull()) {
           QString title = child.firstChildElement("title").text();
           QString desc = child.firstChildElement("description").text();
           QString urirss = child.firstChildElement("link").text();
           if (!title.isEmpty() and !desc.isEmpty() and !urirss.isEmpty()) {
               position++;
               if (position < limiter) {
               contingent.insert(position,QStringList() << encodeBase64(urirss) << encodeBase64(title) << encodeBase64(desc));
               }
           }
           child = child.nextSiblingElement("item");
        }
   xmlfile.close();
   return contingent;
}

typedef QMap<int, QStringList> RssParams;

/* read a static rss version 1/2 file and return QMap params of link title description */
RssParams ReadRssFile( QString fileplace , int limiter )
{
   RssParams contingent;
   QFile xmlfile( fileplace );
   QString errorStr, obname, inhalt;
   int errorLine, errorColumn, position;
   position = 0 -1;
   QDomDocument doc("RSS");
     if(!xmlfile.open( QIODevice::ReadOnly ) ) {
      return contingent;
     }
     if (!doc.setContent(&xmlfile,true, &errorStr, &errorLine, &errorColumn)) {
      xmlfile.close();
      return contingent; 
     }
    QDomElement root = doc.documentElement();
    QDomElement chanelbase = root.firstChildElement("channel");
    QDomElement child = chanelbase.firstChildElement("item");
        while (!child.isNull()) {
           QString title = child.firstChildElement("title").text();
           QString desc = child.firstChildElement("description").text();
           QString urirss = child.firstChildElement("link").text();
           if (!title.isEmpty() and !desc.isEmpty() and !urirss.isEmpty()) {
               position++;
               if (position < limiter) {
               contingent.insert(position,QStringList() << encodeBase64(urirss) << encodeBase64(title) << encodeBase64(desc));
               }
           }
           child = child.nextSiblingElement("item");
        }
   xmlfile.close();
   return contingent;
}

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[wysota]

Attribute is not the same as tag, thus attribute("name") return an empty value, because there is no such attribute. Instead of using attribute(), use QDomElement::text() to retrieve the "value" of each tag.