dynamic ffi function calling in lua

Question

Can we dynamically create a function from string and call a ffi.C binding? example :

ffi.cdef [[

void foo_bar_A_get_info(void);
void foo_bar_B_get_info(void);

]]

some = ffi.load("some.so")
function call_fun(var)
    -- var can be A or B
    some.foo_bar_var_get_info()
end

call_fun("A")
call_fun("B")

I am getting error : missing declaration for symbol 'foo_bar_var_get_info'

I searched online a lot but could not find any way to do it, so wanted to post it here so someone can help.

would some["foo_bar_"..var.."_get_info"]() work?

nonchip
– nonchip

2014-05-22 21:30:09 +00:00
Commented May 22, 2014 at 21:30 — nonchip
– nonchip, Commented May 22, 2014 at 21:30

Colonel Thirty Two · Accepted Answer · 2014-06-03 03:03:46Z

4

C libraries loaded from the FFI are indexed just like Lua table; you can index them with a raw value in the same way:

some["foo_bar"..some_string.."_baz"]()

edited Jun 3, 2014 at 3:03

answered May 22, 2014 at 21:48

Colonel Thirty Two

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