Re: about luaffi

[Daurnimator <quae@...>]

On 12 September 2012 21:31, Martin Krpan <wtxnh-lua@yahoo.com.au> wrote:
> Hello,
> I have compiled luaffi module from https://github.com/jmckaskill/luaffi
> and when I try to run example from http://luajit.org/ext_ffi_tutorial.html
> I get error on this line:
>
>     local buflen = ffi.new("unsigned long[1]", n)        -- this is line 14
>
> ~/tmp/progr/source/LUA/git/luaffi_my $ lua zlibtest.lua
> Uncompressed size:      4000
> lua: unable to convert argument 2 from lua<number> to cdata<unsigned int[1]>
> stack traceback:
>         [C]: in function 'new'
>         zlibtest.lua:14: in function 'compress'
>         zlibtest.lua:31: in main chunk
>         [C]: ?
>

You need to pass n in a table.

local buflen = ffi.new("unsigned long[1]", {n})