Lua – Water's Home

Calling a C Function From Lua

Posted on August 16, 2019 by admin

Prepare So

```
#include <math.h>
```
```
#include <lua.h>
```
```
#include <lauxlib.h>
```
```
#include <lualib.h>
```
```
 
```
```
static int my_sum(lua_State *L){
```
```
    int d1 = luaL_checknumber(L, 1);
```
```
    int d2 = luaL_checknumber(L, 2);
```
```
    lua_pushnumber(L, d1+d2);
```
```
    return 1;
```
```
}
```
```
 
```
```
static int my_info(lua_State *L){
```
```
    lua_pushstring(L, "qinuu");
```
```
    return 1;
```
```
}
```
```
 
```

static const struct luaL_Reg test_lib[] = {

```
    {"my_sum" , my_sum},
```
```
    {"my_info" , my_info},
```
```
    {NULL, NULL}
```
```
};
```
```
 
```
```
int luaopen_test_lib(lua_State *L){
```
```
    //luaL_newlib(L, test_lib); // 5.2
```

    luaL_register(L, "test_lib",test_lib); // lua 5.1

```
    return 1;
```
```
}
```

Test

```
local my_lib = require "test_lib"
```
```
 
```
```
print(type(test_lib))
```
```
 
```
```
print(test_lib.my_sum(23,17))
```
```
 
```
```
print(test_lib.my_info())
```