How to retrieve the GUID of an object from the Active Directory

'================================================================
'Set the next line to reflect a DN for an object in the directory
'================================================================
Set obj = GetObject("LDAP://CN=Username,CN=Users,DC=DOMAIN,DC=COM")
MsgBox "The GUID string Value for user " & obj.Get("DisplayName") & _
       " is " &  ConvertHexStringGUIDToStringGUID(obj.GUID)

'================================================================
' ConvertHexStringGUIDToStringGUID function
'================================================================
Function ConvertHexStringGUIDToStringGUID(strOctet)
    Dim tmpGUID, GUIDStr
    'Convert the string by flipping the bits around.
    GUIDStr = Mid(strOctet, 7, 2)
    GUIDStr = GUIDStr + Mid(strOctet,  5, 2)
    GUIDStr = GUIDStr + Mid(strOctet,  3, 2)
    GUIDStr = GUIDStr + Mid(strOctet,  1, 2)
    GUIDStr = GUIDStr + Mid(strOctet, 11, 2)
    GUIDStr = GUIDStr + Mid(strOctet,  9, 2)
    GUIDStr = GUIDStr + Mid(strOctet, 15, 2)
    GUIDStr = GUIDStr + Mid(strOctet, 13, 2)
    GUIDStr = GUIDStr + Mid(strOctet, 17, Len(strOctet))

    tmpGUID = "{" & Mid(GUIDStr,  1,  8) & "-" & Mid(GUIDStr,  9, 4) & _
              "-" & Mid(GUIDStr, 13,  4) & "-" & Mid(GUIDStr, 17, 4) & _
              "-" & Mid(GUIDStr, 21, 15) & "}"

    ConvertHexStringGUIDToStringGUID = tmpGUID
End Function