Searching a XML document

[ravash5000]

Hi, I am using XML 2.6 under C++. I have huge document that I have to search for specific tags. For example
<info>
<profile>
<Name age="20">Rachel<Name/>
<Name age="22">John<Name/>
<profile/>
</info>

when I seach the above document for Name tag, I should be given those two nodes. What function can I use to do this?
Also, what function do I use to get the attribute of these nodes?

Thank you,

[dkar]

Hi

You can use XSL features.
If you are using MSXML, ther is method IXMLDOMNode.selectNodes(XPath)
where XPath is expression like this '//profile/name'.
Indeed your XPath can be very sophisticated.

For a full xpath syntax look through specification.
Good luck

[mao_03]

there are 2 ways of searching for a node in a large document
here is my code:

  string l_sSearchPattern;
  string l_sResult;
  IXMLDOMNode* myM3NameNode = NULL;
  HRESULT hr;
  // search for one node containing all tree attributes
  l_sSearchPattern += "//node()[@ComponentID=\""  +  
                      XMLHelperFunctions::longToString(M3MessageRef.getComponentID())  +  "\" and ";
  l_sSearchPattern += "@ElementID=\""             +
                      XMLHelperFunctions::longToString(M3MessageRef.getElementID())    +  "\" and ";
  l_sSearchPattern += "@EventID=\""               +  
                      XMLHelperFunctions::longToString(M3MessageRef.getEventID())      +  "\"]";
  hr = XMLHelperFunctions::searchNodeInDocument(myXMLDoc,l_sSearchPattern,&myM3NameNode);
  if ( hr != S_OK )
  {
    hr = XMLHelperFunctions::searchNodeInDocument(myXMLDoc2,l_sSearchPattern,&myM3NameNode);
    if( hr != S_OK )
    {
      l_sSearchPattern.erase();
      // search for nodes containing componentID with a subnode containing elementID and a subnode
      // containing the specified eventID
      l_sSearchPattern += "//node()[@ComponentID=\""  +  
                          XMLHelperFunctions::longToString(M3MessageRef.getComponentID())  +  "\"]//node()[ ";
      l_sSearchPattern += "@ElementID=\""             +
                          XMLHelperFunctions::longToString(M3MessageRef.getElementID())    +  "\"]//node()[ ";
      l_sSearchPattern += "@EventID=\""               +  
                          XMLHelperFunctions::longToString(M3MessageRef.getEventID())      +  "\"]";
      hr = XMLHelperFunctions::searchNodeInDocument(myXMLDoc,l_sSearchPattern,&myM3NameNode);
      if( hr != S_OK )
      {
        hr = XMLHelperFunctions::searchNodeInDocument(myXMLDoc2,l_sSearchPattern,&myM3NameNode);
        if( hr != S_OK )

the helperfunctions:

HRESULT XMLHelperFunctions::searchNodeInDocument( IXMLDOMDocument* pDoc,
                                                  const string &sSearchPattern,
                                                  IXMLDOMNode** pReturnNode )
{
  HRESULT hr = pDoc->selectSingleNode( asciiToBSTR(sSearchPattern.c_str()), pReturnNode );

  return hr;
}

//=================================================================================================

HRESULT XMLHelperFunctions::searchNodeInDocument( IXMLDOMDocument* pDoc, 
                                                  const string &sSearchPattern, 
                                                  IXMLDOMNodeList** pReturnList )
{
  HRESULT hr = pDoc->selectNodes( asciiToBSTR(sSearchPattern.c_str()), pReturnList);

  return hr;
}
HRESULT XMLHelperFunctions::getNodeAttributeValue( IXMLDOMNode* pNode,
                                                   const string &sAttribute,
                                                   string &sAttributeValue )
{
  VARIANT l_varValue;
  VariantInit( &l_varValue );
  l_varValue.vt = VT_BSTR;

  HRESULT hr = getNodeAttributeValueVariant( pNode, sAttribute, &l_varValue );

  if( S_OK == hr )
  {
    sAttributeValue = BSTRtoString( l_varValue.bstrVal );
    VariantClear( &l_varValue );
  }
  return hr;
}

and to get the attribute you want:

    hr = XMLHelperFunctions::getNodeAttributeValue(myM3NameNode,"Name",l_sResult);

let me know if this serves your needs!