On Thursday, 15 October 2020 at 21:29:59 UTC, WhatMeWorry wrote:
I've go a small DLL and a test module both written in D. Why do I need to use the extern(C)? Shouldn't both sides be using D name wrangling?
You have answered your own question. If you're not using extern(C), D just like C++ adds a lot of name mangling which is not "addSeven" but extra characters as well. GetProcAddress which is a Windows call has no idea about D name mangling and therefore will not find the function.
