How do you use the VbTopicData?

The best you can get it a 100ns resolution. Search for the "multimedia timer" in MSDN.

Jesus!!! Does this code work??? (_bstr_t)"DATABASE/TABLE[@Left]" What is this? Never, never do like this. Do: _bstr_t(OLESTR("DATABASE/TABLE[@Left]")) pIXMLDOMNode->Release(); pIXMLDOMNode=NULL; It's not bad, but pIXMLDOMNode = 0 is enough. (LPARAM)(char *)(_bstr_t)Tablename Should be: reinterpret_cast<LPARAM>(static_cast<TCHAR*>(_bstr_t(Tablename))) Such a bad cast should be explicit. pIXMLDOMNode->get_attributes(&pIXMLDOMNamedNodeMap1); You are working with very smart pointer. Instead, do like this: pIXMLDOMNamedNodeMap1 = pIXMLDOMNode->attributes; What is: CHECK_AND_RELEASE(pIXMLDOMDocument2); May be it a: #define CHECK_AND_RELEASE(x) x->AddRef() I don't know. Summary. 1. Never, never use c-casts (like (_bstr_t)x, (LPARAM)y, etc). They are the worst evil, unless you damn sure that you do. It's very hard to find a bug in a such code. 2. Read about _com_ptr_t. Learn how it's intended to use. 3. Avoid macros. 4. Optional, but strongly recommended. Get a Stroustrup.