1.其中lua腳本文件內容，t.lua如下：
function f(ab)
print(ab)
end
ret ,err= pcall(f, "hello world")
print( ret)
print(err)
print("okkkkkkkkkkk")
2.代碼如下：
 #include "stdafx.h"
#include <stdio.h>
#include<iostream>
//g++ -g lua_api-new.cpp -I/usr/local/include /usr/local/lib/liblua.a
using namespace std;
extern "C"
   {
 #include <lua.h>
#include <lauxlib.h>
#include <lualib.h>
 }
#define TRACE_TOP printf("top=%d\n",lua_gettop(L));
template <class T> class LuaMgr
{
public:
static void Register(lua_State *L)
  {
//構造函數 放到全局中（實際中建議集中放到單獨表內）
lua_pushcfunction(L, &LuaMgr <T>::constructor);
lua_setglobal(L, T::classname);
//建立元表
luaL_newmetatable(L, T::classname);
//設置垃圾回收
lua_pushstring(L, "__gc");
lua_pushcfunction(L, &LuaMgr <T>::gc_obj);
lua_rawset(L, -3);
//設置index
lua_pushstring(L, "__index");
lua_pushvalue(L, -2);
lua_rawset(L, -3);
//設置類成員函數。 注意此部分的語法：function并沒有直接聲明在模板內
for (int i = 0; T::function[i].name; i++)
{
lua_pushstring(L, T::function[i].name);
lua_pushnumber(L, i); //upvalue
lua_pushcclosure(L, &LuaMgr<T>::thunk, 1);
lua_rawset(L, -3); //table["T::function[i].name"] = thunk;
 }
}
static int constructor(lua_State *L)//構造函數返回表,該函數用于腳本調用
{
T* obj = new T(L);//實際建立一個對象。可采用共享內存
T** u = (T**)lua_newuserdata(L, sizeof(T*));//獲得一個指針
*u = obj;
//設置u元表
luaL_getmetatable(L, T::classname);
lua_setmetatable(L, -2);
return 1; //返回u
}
//該函數用于c層調用,創建對象。由于沒有直接返回lua，而沒有被引用，要防止被釋放
static void* c_create(lua_State *L)
{
T* obj = new T(L);//實際建立一個對象?？刹捎霉蚕韮却?/span>
void** u = (void**)lua_newuserdata(L, sizeof(T*));//獲得一個指針
*u = obj;
//設置u元表
luaL_getmetatable(L, T::classname);
lua_setmetatable(L, -2);
lua_pop(L,1);
//最好存放在表內，防止在被釋放，如放到全局lua_setglobal(L,"aaafff");
return u; //返回u
}
static int thunk(lua_State *L)
{
int i = (int)lua_tonumber(L, lua_upvalueindex(1));
T** obj = static_cast <T**>(luaL_checkudata(L, 1, T::classname));
return ((*obj)->*(T::function[i].mfunc))(L);
}
static int gc_obj(lua_State *L)
{
T** obj = static_cast <T**>(luaL_checkudata(L, -1, T::classname));
delete (*obj);
printf("deleteing\n");
return 0;
}
struct RegType
{
const char *name;
int(T::*mfunc)(lua_State*);
};
};
class Base
{
public:
Base() {}
~Base() {}
int add(int a, int b)
{
return a + b;
}
};
class Foo //:public Base
{
public:
Foo(lua_State *L) { printf("call Foo constructor\n"); }
~Foo() { printf("call Foo destructor\n"); }
int foo(lua_State *L) { printf("in foo function\n"); return 0; }
int n_add(lua_State *L)
{
int a = NULL;
int b = NULL;
a = (int)luaL_checknumber(L, -2);
b = (int)luaL_checknumber(L, -1);
double result = a+b;//add(a, b);
lua_pushnumber(L, result);
return 1;
}
/**//******************只需增加 ****************************************/
friend class LuaMgr <Foo>;
private:
static const LuaMgr <Foo>::RegType function[];
static const char classname[];
};
const char Foo::classname[] = "Foo";
const LuaMgr <Foo>::RegType Foo::function[] =
{
{ "foo", &Foo::foo},
{ "add_func", &Foo::n_add},
{ NULL , NULL}
};
/**//******************只需增加 end****************************************/
//驅動程序
int main()
{
lua_State *L = lua_open();
luaopen_base(L);
LuaMgr <Foo>::Register(L);
luaL_dofile(L, "t.lua");
//直接在c 內建立userdata.可以把該user傳給lua,在lua內操作對象。lua_newuserdata 地址和lua對象（TValue值）是不同的
//創建時候，必須保存lua對象 ,直接壓入地址不行 ?？稍趌api.h 內增加接口 TValue * luaA_getobject (lua_State *L,int indx ) {return index2adr(L, indx);}
//void** u = (void** )LuaMgr <Foo>::c_create(L); //
lua_close(L);
return 0;
}
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