Example

The following script example creates a new IXMLDOMComment (comment) and appends it as the last child node of DOMDocument.

var xmlDoc = new ActiveXObject("Msxml2.DOMDocument.5.0");
var root;
var comment;
xmlDoc.async = false;
xmlDoc.load("books.xml");
if (xmlDoc.parseError.errorCode <> 0) {
   var myErr = xmlDoc.parseError;
   alert("You have error " + myErr.reason);
} else {
   root = xmlDoc.documentElement;
   comment = xmlDoc.createComment("Hello World!");
   root.appendChild(comment);
   alert(root.xml);
}

Example

The following Microsoft® Visual Basic® example creates a new IXMLDOMComment (comment) and appends it as the last child node of DOMDocument.

Dim xmlDoc As New Msxml2.DOMDocument50
Dim root As IXMLDOMElement
Dim comment As IXMLDOMComment
xmlDoc.async = False
xmlDoc.Load ("books.xml")
If (xmlDoc.parseError.errorCode <> 0) Then
   Dim myErr
   Set myErr = xmlDoc.parseError
   MsgBox("You have error " & myErr.reason)
Else
   Set root = xmlDoc.documentElement
   Set comment = xmlDoc.createComment("Hello World!")
   root.appendChild comment
   MsgBox (root.xml)
End If

The following sample creates and appends a new XMLDOMComment node to the root document element.

#import "msxml5.dll"
using namespace MSXML2;

inline void TESTHR( HRESULT _hr ) 
   { if FAILED(_hr) throw(_hr); }

void XMLDOMCommentSample()
{
   try {
      IXMLDOMDocumentPtr docPtr;
      IXMLDOMNodePtr DOMNodePtr;

      //init
      TESTHR(CoInitialize(NULL)); 
      TESTHR(docPtr.CreateInstance("Msxml2.DOMDocument.5.0"));
      
      // load a document
      _variant_t varXml("C:\\book.xml");
      _variant_t varOut((bool)TRUE);
      varOut = docPtr->load(varXml);
      if ((bool)varOut == FALSE)
         throw(0);
      MessageBox(NULL, _bstr_t(docPtr->xml), _T("Original Document"), MB_OK);

      DOMNodePtr = docPtr->createComment("This is a comment node");
      docPtr->documentElement->appendChild(DOMNodePtr);

      MessageBox(NULL, _bstr_t(docPtr->xml), _T("New Document"), MB_OK);

   } catch(...)
   {
      MessageBox(NULL, _T("Exception occurred"), _T("Error"), MB_OK);
   }
   CoUninitialize();
}

Header and IDL files: msxml2.h, msxml2.idl