   error LNK2019
  Hi everyone.I try to compile Two-kings.de's tutorial number 3, but im getting 1 error i justcant solve!It's probably just a lib file i have missed but i dont know wich one -.-Anyway.. here's the error:1>cApplication.obj : error LNK2019: unresolved external symbol "long __stdcall WindowProcedure(struct HWND__ *,unsigned int,unsigned int,long)" (?WindowProcedure@@YGJPAUHWND__@@IIJ@Z) referenced in function "public: void __thiscall CApplication::InitWindow(void)" (?InitWindow@CApplication@@QAEXXZ)Any ideas?   
  Inside CApplication::InitWindow you reference WindowProcedure, but WindowProcedure is never implemented. It's also possible that if you made it a member function from CApplication it's not static.   ;  OK, im gonna check it right now. Thanks =)   