lua 調用c子產品

c函數聲明要符合類型：typedef int (*lua_CFunction) (lua_State *L);

1.在c代碼運作環境下執行lua代碼。

#include <stdio.h>
#include <string.h>
#include <lua.h>
#include <lauxlib.h>
#include <lualib.h>

static int cadd(lua_State* L)
{

    double op1 = luaL_checknumber(L,);
    double op2 = luaL_checknumber(L,);

    lua_pushnumber(L,op1 + op2);

    return ;
 }

const char* testfunc = "print(cadd(1.0,2.0))";

int main()
 {
    lua_State* L = luaL_newstate();
    luaL_openlibs(L);

    lua_register(L, "cadd", cadd);
    if (luaL_dostring(L,testfunc))
         printf("Failed to invoke.\n");
     lua_close(L);
     return ;
 }
           

2.引用c動态庫

#include <stdio.h>
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
static int add(lua_State *L)
{
    int a,b,c;
    a = lua_tonumber(L,);
    b = lua_tonumber(L,);
    c = a+b;
    lua_pushnumber(L,c);
    printf("test hello!!!\r\n");
    return ;
}
static const struct luaL_Reg lib[] =
{
    {"testadd",add},
    {NULL,NULL}
};        

int luaopen_testlib(lua_State *L)
{        
    luaL_register(L,"testlib",lib);
    return ; 
}        
           

編譯: gcc test.c -fPIC -shared -o testlib.so

lua腳本編寫:

require("testlib")
c = testlib.testadd(,)
print("The result is ",c);