This is a common problem for novice MASM programmers,...how to correctly import a function from a DLL (often written in another language),...or, how to write a DLL function export that will interoperate with programs written in other programming languages. Also, explains function name mangling (which is different in different languages), and, how to unmangle and undecorate function names.
DllExports, Common Problems and Solutions, Code Project, Aug 2014 (http://www.codeproject.com/Articles/778255/DllExports-Common-Problems-and-Solutions)
Very good article, Zen. Thank you for sharing it. :t
Gunther