Re: how to construct sturct object in lua
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- Subject: Re: how to construct sturct object in lua
- From: Sean Conner <sean@...>
- Date: Thu, 7 Mar 2013 01:54:37 -0500
It was thus said that the Great Jim zhang once stated:
> Code to be test:
> struct A
> {
> int a,
> int b
> };
>
> int sum ( struct A * s)
> {
> retunr s->a+s->b;
> }
>
> How could I construct a struct A object in lua scripts, and pass the pointer of this struct into sum() to test it?
Well, here's one way:
------- Lua -----------
sum = require "sum"
x = { a = 1 , b = 2 }
y = sum(x)
print(y)
z = sum { a = 2 , b = 3 }
print(z)
/********* C *******************/
#include <lua.h>
#include <lauxlib.h>
static int sumlua(lua_State *L)
{
struct A;
int x;
lua_getfield(L,1,"a");
lua_getfield(L,1,"b");
A.a = luaL_checkinteger(L,-2);
A.b = luaL_checkinteger(L,-1);
x = sum(&A);
lua_pushinteger(L,x);
return 1;
}
int luaopen_sum(lua_State *L)
{
lua_pushcfunction(L,sumlua);
return 1;
}
Compile the C code into the appropriate shared object for your platform, and
then the Lua code will be able to load the C interface.
-spc