I have a particular function in an Excel addin(xll).
The addin is proprietary and we do not have access to the source code. However we need to call some functions contained within the addin and we would like to call it from a C# program.
Currently, I was thinking of writing a C++ interface calling the Excel function with xlopers, then calling this C++ interface from C#.
Does anybody who has prior experience of this kind of issues know what would be the best solution for that ?