[笔记]Lua脚本学习笔记《二》调用cpp动态库

#ifndef CPP_DLL_API_H
#define CPP_DLL_API_H
#ifdef __cplusplus
#define EXTERN_C extern "C"
#else
#define EXTERN_C extern "C"
#endif
#ifndef EXPORT_API
#define EXPORT_API EXTERN_C __declspec(dllexport)
#else
#define EXPORT_API EXTERN_C __declspec(dllimport)
#endif
#endif

#include "cpp_dll_lib_api.h"
extern "C"{
#include <lua.h>
#include <lauxlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <lualib.h>
#include <math.h>
}
#include <Windows.h>
EXPORT_API int Add(lua_State *L){
  int param_count = lua_gettop(L);
  if (param_count != 2) {
    lua_pushnil(L);
    lua_pushstring(L, "ShowMessageBox: param num error");
    return 2;
  }
  int arg1 = luaL_checknumber(L, 1);
  int arg2 = luaL_checknumber(L, 2);
  lua_pushnumber(L, arg1 + arg2);
  return 1;
}
EXPORT_API int ShowMessageBox(lua_State *L)
{
  int param_count = lua_gettop(L);
  if (param_count != 2) {
    lua_pushnil(L);
    lua_pushstring(L, "ShowMessageBox: param num error");
    return 2;
  }
  const char * sTitle = luaL_checkstring(L, 1);
  const char * sText = luaL_checkstring(L, 2);
  if (sTitle == NULL || strlen(sTitle) == 0 || sText == NULL || strlen(sText) == 0) {
    lua_pushnil(L);
    lua_pushstring(L, "ShowMessageBox: param error");
    return 2;
  }
  int ret = MessageBoxA(NULL, sTitle, sText, 0);
  lua_pushnumber(L, ret);
  return 1;
}

local pf = package.loadlib("cpp_dll_lib.dll","ShowMessageBox")
print(pf)
pf("hello", "again")

dumpbin.exe /exports .\cpp_dll_lib.dll