@SGaist @hskoglund @belab @Franckynos
Thank you for helping me!

You were right, I did not import the symbols.

I added this :

#ifdef GAME_EXPORTS # define GAME_API __declspec(dllexport) #else # define GAME_API __declspec(dllimport) #endif

to my DLL code and now everything works.

Have a nice day, you rock! :-)