LUA脚本调用C函数的方法


LUA脚本调用C函数是非常方便的，需要在C文件里首先实现好C的函数，然后把C函数和lua的调用名注册到一个库里。

下面的例子是lua脚本调用test.output然后会最终调用到C函数Test_output.

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#define ltestlib_c

#define LUA_TEST_LIB

#include "lua.h"

#include "lauxlib.h"

#include "lualib.h"

static int Test_output(lua_State *L)

{

 unsigned char output[128];

 fputs("enter Test_output",stdout);

 

 int n = lua_gettop(L);  /* number of arguments */

 //extern int sprintf (char *, const char *, ...);

 sprintf(output,"input parameter number is <%d>\n",n);

 fputs(output, stdout);

 

 return 1;

}

static const luaL_Reg testlib[] = {

  {"output", Test_output},

  {NULL, NULL}

};

LUALIB_API int luaopen_test (lua_State *L) {

  luaL_register(L, "TEST", testlib);

  return 1;

}

static const luaL_Reg lualibs[] = {

  {"", luaopen_base},

  {LUA_LOADLIBNAME, luaopen_package},

  {LUA_TABLIBNAME, luaopen_table},

  {LUA_IOLIBNAME, luaopen_io},

  {LUA_OSLIBNAME, luaopen_os},

  {LUA_STRLIBNAME, luaopen_string},

  {LUA_MATHLIBNAME, luaopen_math},

  {LUA_DBLIBNAME, luaopen_debug},

  {"TEST",luaopen_test},

  {NULL, NULL}

};

test.output(1,2,3,4,5,6,7,8,9)