Compares a CComBSTR with a string. CComBSTRs are compared textually in the context of the user's default locale.
[in] A CComBSTR object.
[in] A zero-terminated string.
[in] Must be NULL.
Returns true if the item being compared is equal to the CComBSTR object; otherwise, returns false.
The final comparison operator just compares the contained string against NULL.