VC++/MASMでx64 DLLを作る

環境

Windows 11 Pro (x64)
Visual Studio Community 2022

Visual Studio 2022
x64 Native Tools Command Prompt for VS 2022

作成

C++

fig_c.cpp

/*
cl /LD /MD fig_c.cpp
*/
#define DLL_EXPORT extern "C" __declspec(dllexport)

DLL_EXPORT int hoge(int a, int b)
{
	return a * b;
}

MASM64

fig_a.asm

comment *
ml64 /c /Fl fig_a.asm
link /dll /entry:DllMain fig_a
*
.code
DllMain proc
	mov	eax, 1
	ret
DllMain endp

hoge proc export
	imul	ecx, edx
	mov	eax, ecx
	ret
hoge endp
end

確認

C++

fig1.cpp

/*
cl /MD fig1.cpp
*/
#pragma comment(lib, "fig_c")

#include <stdio.h>

extern "C" int hoge(int a, int b);

int main(void)
{
	int x = hoge(3, 4);
	printf("%d\n", x);
}

Python

fig2.py

# "C:\Program Files\LibreOffice\program\python" fig2.py
import ctypes

dll = ctypes.WinDLL(r"./fig_c")
print(dll.hoge(3, 4))