MSDN XPath

• IXMLDOMDocument *pXMLDoc = NULL; 

      IXMLDOMNode *pNode = NULL; 

      BSTR     bstr = NULL;  

      VARIANT_BOOL status; 

      VARIANT var; 

      HRESULT hr; 

      int i = 0; 

      CoInitialize(NULL); 

      VariantInit(&var); 

      hr = CoCreateInstance(CLSID_DOMDocument, NULL,  

          CLSCTX_INPROC_SERVER | CLSCTX_LOCAL_SERVER 

          , IID_IXMLDOMDocument, (LPVOID*)&pXMLDoc); 

      if (!pXMLDoc || pXMLDoc==NULL) { 

          iItems = -1; 

          // DOM creation failed! 

      } 

      VariantClear(&var); 

      var = bstr2var(_bstr_t("d:\book.xml")); 

      hr = pXMLDoc->load(var, &status); 

      if (status!=VARIANT_TRUE) { 

          iItems = -2; 

          // unable to load file! 

      } 

      pXMLDoc->selectSingleNode(L"catalog/book[last()]/author", &pNode);       

      if (pNode!=NULL) { 

          pNode->get_text(&bstr); 

          CString u; 

          u.Format("%s", (LPCTSTR)(_bstr_t)bstr); 

          AfxMessageBox(u); 

      } else { 

          AfxMessageBox("pNode = NULL!"); 

      } 

  
  The result of above expression is pNode = NULL.
  
  I use VC++ 6.0 and MSXML2 (just curious, I also tried to use VC 2005 and MSXML6 with similar code as above, but the result is the same)
  
  Did I miss something?
  
  Thanks!
  
  -nb: I test the expression using BIT-101 (http://www.bit-101.com/xpath/) and works fine.
  
  
  

  Tuesday, November 11, 2008 1:40 PM

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  Houari

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  To use XPath you have to set the property "SelectionLanguage" to "XPath". 
  
  pXMLDoc->setProperty("SelectionLanguage", "XPath");
  
  To be able to do this, you have to use the IXMLDOMDocument2 interface instead of IXMLDOMDocument.
  
  Read more about How To Use XPath Queries in MSXML.