Expected from ffi.cast in LuaJIT

Asked May 04 '15 at 14:07

Active May 04 '15 at 14:07

Viewed 137 times

I am trying to write a LuaJIT FFI module for sqlite3. The exec function takes a callback for each row returned. https://www.sqlite.org/c3ref/exec.html

in LuaJIT I simply enter

ffi = require 'ffi'
ffi.cast("int (callback*)(void*,int,char**,char**)")

which I think should be the correct cast for a function pointer as per the SQLite docs, but I get:

stdin:1: '<eof>' expected near 'callback'

I am sure I have something wrong in the syntax here, but I can't find any documentation/examples for FFI.cast() used for a function pointer with args.

asked May 04 '15 at 14:07

user2240431

1

`your_function = require 'ffi'.cast("__stdcall int (*)(void*,int,char**,char**)", your_pointer_to_function)` – Egor Skriptunoff May 04 '15 at 15:22
That's perfect! Thanks Egor. If you made it an answer, I could accept it :) – user2240431 May 04 '15 at 16:11
Sorry, I'm too lazy :-) – Egor Skriptunoff May 04 '15 at 16:46
1

Are you aware that there is an [existing LuaJIT FFI binding](https://github.com/ColonelThirtyTwo/lsqlite3-ffi) to sqlite3? – siffiejoe May 04 '15 at 21:02
yup, there are 3. I am making a binding for luvit, and using lsqlite3-ffi as a reference. This line of code is actually from lsqlite3-ffi. thanks – user2240431 May 05 '15 at 21:47

Expected from ffi.cast in LuaJIT

0 Answers0