How to call a delphi function from C++ that doesn't have stdcall specified?

Question

C++ / C#

Tried using __fastcall but still doesn't work.
I have a dll, the calls of which do not need to be changed, but it must be called from the program (I will not give an example of a function, because now this is not a bit about that). I can't understand why this test case doesn't work:
function TestRunMethod2(x1 :Integer):Integer; export;
begin
Result := x1;
end;
C++ code:
HMODULE mod = LoadLibraryW(L"Project12.dll");
typedef int (__fastcall *f_funci)(int x1);
f_funci funci = (f_funci)GetProcAddress(mod, "TestRunMethod2");
register is fastcall, isn't it?
It does not work in this case - instead of the result it returns 0. If you declare it as stdcall both there and there, everything is fine. But I will need to call a function that is not declared as stdcall.

Answer 1

The calling convention types are register, pascal, cdecl, stdcall, and safecall.
By default for delphi - register
And that means "does not work". Here you can assume many options:
1. The library does not export the function.
2. Export only by index
3. Pre-initialization of the library is required by calling another function
, etc.