lua

cpp 调用 lua

项目结构 :

.
├── CMakeLists.txt
├── hello.lua
└── main.cpp

CMakeLists.txt:

cmake_minimum_required(VERSION 3.19)
project(lua_cpp)

set(CMAKE_CXX_STANDARD 17)
include(FindLua)
find_package(Lua REQUIRED)

add_executable(lua_cpp main.cpp)

target_link_libraries(${PROJECT_NAME} PRIVATE ${LUA_LIBRARIES})
target_include_directories(${PROJECT_NAME} PRIVATE ${LUA_INCLUDE_DIR})

hello.lua：

str = "Hello, Lua"
tbl = { name = "zhang", id = 2018 }

function add(a, b)
    return (a + b)*2
end

print(str)

cpp：

#include <iostream>
#include <lua.hpp>
#include <cassert>
#include <string>

using namespace std;

int main() {
    auto L = luaL_newstate();
    auto bRet = luaL_loadfile(L, "hello.lua");
    lua_pcall(L,0,0,0);
    lua_getglobal(L, "str");
    cout<<lua_tostring(L, -1)<<endl;
    lua_getglobal(L, "add");
    lua_pushnumber(L, 10);
    lua_pushnumber(L, 20);
    lua_pcall(L, 2,1,0);
    cout<<lua_tonumber(L, -1);
    lua_getglobal(L, "print");
    lua_pushnumber(L, 20);
    lua_pcall(L, 1,1,0);
    lua_close(L);
    return 0;
}