c++ xml parser function not working

Question

I am using xerces c++ to manipulate an xml file? but getNodeValue() and setNodeValue() are not working but getNodeName() is working. Do anyone has any suggestions?

 if( currentNode->getNodeType() &&  currentNode->getNodeType() == DOMNode::ELEMENT_NODE ) 
         {
        // Found node which is an Element. Re-cast node as element
            DOMElement* currentElement= dynamic_cast< xercesc::DOMElement* >( currentNode );
            if( XMLString::equals(currentElement->getTagName(), TAG_ApplicationSettings))
            {
               // Already tested node as type element and of name "ApplicationSettings".
               // Read attributes of element "ApplicationSettings".
               const XMLCh* xmlch_OptionA = currentElement->getAttribute(ATTR_OptionA);
               m_OptionA = XMLString::transcode(xmlch_OptionA);
                   XMLCh* t,*s;
        //s= XMLString::transcode("manish");
        //currentNode->setElementText(s);
                  t=(XMLCh*)currentNode->getNodeName();
               s=(XMLCh*)currentNode->getNodeValue();

cout<getNodeValue()) << "\n";

so what is the node you're parsing, what are expecting, what are you getting ? — Tristram Gräbener
– Tristram Gräbener, Commented Apr 4, 2011 at 14:13

Aliaksei Kliuchnikau · Accepted Answer · 2012-01-28 17:19:42Z

1

A DOMElement may contain a collection of other DOMElements or a DOMText. To get the text value of an element you need to call the method getTextContent(), getNodeValue will always return NULL. The is another better way conceptually, as the DOMText is a child of the DOMElement we can traverse through the child node and get the value.

Below is the logic in the form of a method:

string getElementValue(const DOMElement& parent)
{    
 DOMNode *child;   

 string strVal;

 for (child = parent.getFirstChild();child != NULL ; child = child->getNextSibling())    
 {    
    if(DOMNode::TEXT_NODE == child->getNodeType())    
    {    
     DOMText* data = dynamic_cast<DOMText*>(child);    
     const XMLCh* val = data->getWholeText();    
     strVal += XMLString::transcode(val);    
    }    
    else    
    {    
        throw "ERROR : Non Text Node";    
    }    
 }    
 return strVal;   
}

Hope this helps :)

edited Jan 28, 2012 at 17:19

Aliaksei Kliuchnikau

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answered Jan 28, 2012 at 14:19

Sandipan Karmakar

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Comments

Darshana · Accepted Answer · 2012-06-07 14:30:00Z

1

getNodeValue() will always return an empty string, because the "value" of an element node is in its child. In our case it is text node child. Either way is to iterate through child nodes or use getTextContent. First check for child nodes in a node using hasChildNodes() then use methods like getFirstChild() etc. . Afterwards use getNodeValue().

DOMNode* ptrDomNode = SomeNode;

if(ptrDomNode->hasChildNodes())
{
    DOMNode* dTextNode =  ptrDomNode->getFirstChild();         
    char* string = XMLString::transcode(dTextNode->getNodeValue());
}

edited Jun 7, 2012 at 14:30

Darshana

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answered Jun 7, 2012 at 4:41

Gaurav Mall

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