From: Clifford Heath <no.spam@...>
Date: 2008-11-11T13:47:33+09:00
Subject: Re: [ANN] FFI 0.1.1 (Foreign Function Interface) for Ruby 1.8.6/7 and 1.9

Charles Oliver Nutter wrote:
> Actually structs are already supported!

Sorry if you see this twice, posting difficulties.

I'm having a bash at wrapping freetds. This library
has a Context struct which contains three callback
function pointers. POLS says these should look like
this:

 callback :handle_message, [ :pointer, :pointer, :pointer ], :in   # TDSCONTEXT, TSSSOCKET, TDSMESSAGE
 callback :handle_int, [ :pointer ], :in     # void*

 class Context < FFI:Struct
   layout \
     :locale, :pointer, 0,                   # TDSLOCALE
     :parent, :pointer, 4,                   # void *
     :msg_handler, :handle_message, 8,       # callback(TDSCONTEXT, TDSSOCKET, TDSMESSAGE)
     :err_handler, :handle_message, 12,      # callback(TDSCONTEXT, TDSSOCKET, TDSMESSAGE)
     :int_handler, :handle_int, 16           # callback(void*)
 end              

Am I on the right track, or is this not possible yet?

Clifford Heath.