On Thursday, 10 June 2021 at 13:19:34 UTC, dokutoku wrote: > I still haven't solved this problem. Not sure if this is the issue, but you don't need `extern` on these. You already have the `extern(C++)` thing at the top of the file. ```d extern void str_test(LPCSTR str1); nothrow @nogc extern void wstr_test(LPCWSTR str1); ```