lua中的轻量级userdata以及userData

来源：互联网发布：全境封锁网络优化编辑：程序博客网时间：2024/05/30 22:52

function Test(userdata)
print(userdata)
DoSomeThing(userdata)

-- userdata:showmessage

end

#include "stdafx.h"
#include "stdlib.h"
extern "C"
{
#include "lua.h"
#include "lauxlib.h"
#include "lualib.h"
}

#define __LightUserData__   1

class VEC
{
public:
   int mx;
   int my;

   VEC()
   {
       printf("constructor\n");
       mx=100;
       my=120;
   }

   void ShowMessage()
   {
       printf("modify message\n");

       mx=1000;
       my=2000;

       printf("now x=%d,y=%d\n",mx,my);
   }
};

int DoSomeThing(lua_State * L)
{
   VEC *pVec = (VEC *)lua_touserdata(L,-1);

   printf("LightUserData: x=%d,y=%d\n",pVec->mx,pVec->my);

   pVec->ShowMessage();
   return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
   lua_State *L = luaL_newstate();
   luaL_openlibs(L);

   lua_register(L,"DoSomeThing",DoSomeThing);

   if(0 != luaL_dofile(L,"helloworld.lua"))
   {
       printf("%s",lua_tostring(L,-1));
   }

   lua_getglobal(L,"Test");

#if __LightUserData__

   //这个调用了构造函数
   VEC *pVec = new VEC;
   lua_pushlightuserdata(L,pVec);
#else

   //这个不会调用构造函数
   VEC *pVec = (VEC *)lua_newuserdata(L,sizeof(VEC));
   pVec->mx = 100;
   pVec->my = 200;

#endif

   lua_pcall(L,1,0,0);
   system("pause");
    return 0;
}

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