Lua Introduction to Lua C API Calling Lua functions
Example
#include <stdlib.h>
#include <lauxlib.h>
#include <lua.h>
#include <lualib.h>
int main(void)
{
lua_State *lvm_hnd = lua_open();
luaL_openlibs(lvm_hnd);
/* Load a standard Lua function from global table: */
lua_getglobal(lvm_hnd, "print");
/* Push an argument onto Lua C API stack: */
lua_pushstring(lvm_hnd, "Hello C API!");
/* Call Lua function with 1 argument and 0 results: */
lua_call(lvm_hnd, 1, 0);
lua_close(lvm_hnd);
return EXIT_SUCCESS;
}
In the example above we're doing these things:
- creating and setting up Lua VM as shown on the first example
- getting and pushing a Lua function from global Lua table onto virtual stack
- pushing string
"Hello C API"as an input argument onto the virtual stack - instructing VM to call a function with one argument which is already on the stack
- closing and cleaning up
NOTE:
Bare in mind, that lua_call() pops the function and it's arguments from the stack leaving only the result.
Also, it would be safer using Lua protected call - lua_pcall() instead.
