#include <kernwin.hpp> // For get_screen_ea() definition
#include <funcs.hpp>

ea_t addr = get_screen_ea();

// Get the function after the one containing the address where the user's cursor is positioned
func_t *nextFunc = get_next_func(addr);

if (nextFunc != NULL)
    msg("Next function starts at %a\n", nextFunc->startEA);