On Oct 26, 2011, at 10:31 AM, John Lee wrote:

> I tried wrapping my code inside a module, but the problem still
> persists.
> 
> Do you think :pointer is the correct type to represent the array in
> attach_function.
> 
> I know that if you have an array in a struct, you can specify it as:
> class Struct1 < ::FFI::Struct
>   layout :value1, [:int, 3]
> end
> 
> So I tried to replace :pointer with [:int, 3] in attach_function, but
> it complains about "unable to resolve type ':int, 3]' <TypeError>"
> attach_function :function1, [[:int, 3], :int, :int], :int
> 
> Has anyone got arrays to work with FFI?

I have gotten it working in my own project. Take a look at my definition for a function that takes an array:

https://github.com/chuckremes/ffi-rzmq/blob/master/lib/ffi-rzmq/libzmq.rb#L102

I call that function here:

https://github.com/chuckremes/ffi-rzmq/blob/master/lib/ffi-rzmq/poll.rb#L44

The array that is passed to that function is constructed in this file:

https://github.com/chuckremes/ffi-rzmq/blob/master/lib/ffi-rzmq/poll_items.rb

In that file, the #clean method is where most of the array work is done where I construct the array.

I know it's a big example, but it works and has worked without change since the ffi gem was at 0.6.3.

cr