lua入门之三：lua调用c/c++库（动态链接方式）

旧城等待， 2022-08-27 09:54 277阅读 0赞

**dll通过函数luaL\_openlib导出，然后lua使用package.loadlib导入库函数，基本就是这么个过程，下面上代码来说明一切。**

#include "stdafx.h"
    
    
    #ifdef __cplusplus
    extern "C"{
    #endif
    
    #include "lua.h"
    #include "lualib.h"
    #include "lauxlib.h"
    
    #ifdef __cplusplus
    }
    #endif
    
    #include <math.h>
    
    #pragma comment(lib, "lua51.lib")
    
    
    static int math_abs(lua_State *L)
    {
    	lua_pushnumber(L, abs((int)luaL_checknumber(L, 1)));
    
    	return 1;
    }
    
    static int math_cos(lua_State *L)
    {
    
    	lua_pushnumber(L, cos((double)luaL_checknumber(L, 1)));
    
    	return 1;
    
    }
    
    static int math_sin(lua_State *L)
    {
    
    	lua_pushnumber(L, sin((double)luaL_checknumber(L, 1)));
    
    
    	return 1;
    }
    
    static const luaL_reg mathlib[] = {
    	{ "abs", math_abs },
    	{ "cos", math_cos },
    	{ "sin", math_sin },
    	{ NULL, NULL }
    };
    
    
    static int ShowMessage(lua_State * L)
    {
    	lua_pushnumber(L, 1000);
    	printf("show message and push 1000 \n");
    	return -1;
    }
    
    
    #ifdef _WIN32
    extern "C" __declspec(dllexport) int luaopen_luadlllib(lua_State* L)
    {
    #else
    extern "C"  int luaopen_luadlllib(lua_State* L)
    {
    
    #endif // _WIN32
    
    	//MessageBox(NULL, TEXT("Register C++ Functions..."), NULL, MB_OK);
    
    	luaL_openlib(L, "DY_MATH", mathlib,0);
    	return 1;
    }

--region loadlib.lua
    	--Date
    	--此文件由[BabeLua]插件自动生成
    
       --(package.loadlib("./../Debug/libforlua", "luaopen_luadlllib"))()
        --(package.loadlib("./../Debug/libforlua.dll", "luaopen_luadlllib"))()
        local libpath="./../Debug/libforlua.dll"
        local loadlibfunc=package.loadlib(libpath,"luaopen_luadlllib")
        loadlibfunc()
    
    	function COS(a)
    	print("called COS in lua script")
    	return DY_MATH.cos(a)
    	end
    
    
    	function SIN(a)
    	print("called SIN in lua script")
    	return DY_MATH.sin(a)
    	end
    
    
    	function SHOWMESSAGE()
    	showmessage()
    	end
    
       
    
    	print(COS(60*3.1415926/180))
        
        print("enter a number:") 
        a = io.read("*number") 
    
    	--endregion

babelua插件的设置：

![SouthEast][]

示例工程的下载地址:[http://download.csdn.net/detail/x356982611/7401781][http_download.csdn.net_detail_x356982611_7401781]

[SouthEast]: /images/20220824/9d0f777ae7014e0aafa0dca53fdd7fbb.png
[http_download.csdn.net_detail_x356982611_7401781]: http://download.csdn.net/detail/x356982611/7401781