Excel에서 데이터 모델 만들기 – Excel
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https://www.codeproject.com/Articles/505791/Writing-Simple-COM-ATL-DLL-for-VS2012
https://www.codeproject.com/Articles/916/Using-User-Defined-Types-in-COM-ATL
https://stackoverflow.com/questions/54513252/reading-safearray-of-udt-containing-safearray