Please help me
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- Subject: Please help me
- From: "Abhinav Lele" <abhinav.lele@...>
- Date: Wed, 2 Jan 2008 11:28:28 +0530
I am trying to run a function from C code, but I am unable to do so.
Code:
#include <stdio.h>
#include "lua/lua.h"
#include "lua/lualib.h"
#include "lua/lauxlib.h"
int main() {
lua_State * lc;
lc = lua_open();
if(lc == NULL) return 1;
luaopen_base(lc);
luaopen_table(lc); /* opens the table library */
luaopen_io(lc); /* opens the I/O library */
luaopen_string(lc); /* opens the string lib. */
luaopen_math(lc); /* opens the math lib. */
char *lua_script = "function f(x,y)\n return 145\n end";
if(luaL_loadbuffer(lc, lua_script, strlen(lua_script), "line") != 0) { printf("ERRLoad\n"); return 3; }
double x,y,z;
/* push functions and arguments */
lua_getglobal(lc, "f"); /* function to be called */
lua_pushnumber(lc, x); /* push 1st argument */
lua_pushnumber(lc, y); /* push 2nd argument */
/* do the call (2 arguments, 1 result) */
if (lua_pcall(lc, 2, 1, 0) != 0)
printf("error running function `f': %s",
lua_tostring(lc, -1));
/* retrieve result */
if (!lua_isnumber(lc, -1))
printf("function `f' must return a number");
z = lua_tonumber(lc, -1);
lua_pop(lc, 1); /* pop returned value */
lua_close(lc);
return 0;
}
Error:
error running function `f
': attempt to call a nil valuefunction `f' must return a number