The library makes extensive use of GetModuleHandle(NULL) to obtain the instance handle. This is discouraged, as it does not work for targets that are not executables, such as DLLs.

A possible solution for this would be to use the __ImageBase linker pseudovariable, which is intended for static libraries as described here.

This trick has also been used in the Windows Implementation Library for C++ which has extensive usage:

https://github.com/microsoft/wil/blob/master/include/wil/win32_helpers.h#L513-L514