First Lua function running in C

这是我在C里面跑出来的第一个Lua 文件， 纪念一下。

1.Set up envirnonment:

Mac下面 Lua的src (即include) 和lib(binary)是分开的, 所以需要分别下载。

使用的是 5.2.3 的src 和 standard lib(5.2.1_MacOS107_lib).

include 和 lib 在gcc 编译的时候需要用-L 引入。

2.代码：

VERY IMPORTANT:

ua_open() should not be used. In lua-5.1 it's still available as simple wrapper macro for luaL_newstate(). In lua-5.2 it doesn't exist at all. Attached patch replaces lua_open() call in freeciv code with luaL_newstate() call that works with both lua-5.1 and lua-5.2.

所以 之前写的程序有问题。

 改写程序之后 才能run。

gcc :

gcc -o HelloMac main.c -L/Users/***/Downloads/lua-5.2.1_MacOS107_lib/include/ -L/Users/***/Documents/lua-5.2.3/src/ -llua

代码如下：

#include <stdio.h>
#include <string.h>
#include "/Users/***/Documents/lua-5.2.3/src/lua.h"
#include "/Users/***/Documents/lua-5.2.3/src/lauxlib.h"
#include "/Users/***/Documents/lua-5.2.3/src/lualib.h"

int main (void) {
    lua_State *L = luaL_newstate();   /* opens Lua */
    luaL_openlibs(L);
    
    luaL_dostring(L, "a = 10 + 5");
    lua_getglobal(L, "a");
    int i = (int)lua_tointeger(L, -1);
    printf("%d
", i);
    
    
    lua_close(L);
    return 0;
}