Lua的userdata用法

最新推荐文章于 2025-05-27 19:52:21 发布

naonao8355

最新推荐文章于 2025-05-27 19:52:21 发布

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本文介绍了一个C结构体如何与Lua脚本进行数据交互的具体实例，展示了如何将C语言中的结构体数据传递给Lua，并从Lua中读取修改后的数据。

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想把C的结构

struct Player
{
	WORD	wChairID;	 int      iHeroID;	 int      iChosenHeros[16];
};

如上传给lua

#include "stdio.h"

extern "C"
{
#include "lua/lua.h"
#include "lua/lualib.h"
#include "lua/lauxlib.h"
};



typedef struct 
{
int  wChairID;
int  iHeroID;
int  iChosenHeros[16];
}
Player;

/* LUA接口声明*/
lua_State* L;

void Operate(Player &obj)
{
int i;

lua_getglobal(L, "PlayOperate");

    lua_newtable(L);
lua_pushstring(L, "wChairID");
    lua_pushnumber(L, obj.wChairID);
lua_settable(L, -3);
    lua_pushstring(L, "iHeroID");
lua_pushnumber(L, obj.iHeroID);
lua_settable(L, -3);

lua_pushstring(L, "iChosenHeros");
lua_newtable(L);
for (i=0;i<16;++i)
{
lua_pushnumber(L, i);
lua_pushnumber(L, obj.iChosenHeros[i]);
lua_settable(L, -3);
}
    lua_settable(L, -3);

    lua_call(L, 1, 1);

lua_pushstring(L, "wChairID");
int n=lua_gettop(L);
lua_gettable(L, -2);
obj.wChairID = (int)lua_tonumber(L, -1);
lua_pop(L, 1);
lua_pushstring(L, "iHeroID");
lua_gettable(L, -2);
obj.iHeroID = (int)lua_tonumber(L, -1);
lua_pop(L, 1);
lua_pushstring(L, "iChosenHeros");
lua_gettable(L, -2);
for (i=0;i<16;++i)
{
lua_pushnumber(L, i);
lua_gettable(L, -2);
obj.iChosenHeros[i]=(int)lua_tonumber(L, -1);
lua_pop(L, 1);
}

}

int main(int argc, char *argv[])
{
int i;
    Player obj;

obj.wChairID = 1;
obj.iHeroID  = 2;

for(i=0; i<16; ++i)
obj.iChosenHeros[i]=3;

//print initial value
printf( "The origin is blow:\n");
printf( "obj.wChairID = %d\n", obj.wChairID);
printf( "obj.iHeroID = %d\n", obj.iHeroID);
for(i=0; i<16; ++i)
printf( "obj.iChosenHeros[%d] = %d\n", i, obj.iChosenHeros[i]);


/* initialize Lua */
L = lua_open();
    if (NULL == L)
    {
return -1;
    }
/* load Lua base libraries */
luaL_openlibs(L);

/* load the script */
luaL_dofile(L, "e:\\aaa.lua");  //这里指定aaa.lua文件的位置

/* call function */
Operate(obj);

/* print the result */
printf( "The result is blow:\n");
printf( "obj.wChairID = %d\n", obj.wChairID);
printf( "obj.iHeroID = %d\n", obj.iHeroID);
for(i=0; i<16; ++i)
printf( "obj.iChosenHeros[%d] = %d\n", i, obj.iChosenHeros[i]);

/* cleanup Lua */
lua_close(L);

return 0;

}

=============aaa.lua==========

function PlayOperate(x)
    x.wChairID = x.wChairID+1
    x.iHeroID = x.iHeroID+1
    x.iChosenHeros[0]= 9
    x.iChosenHeros[1]= 10
    
    return x
end