Re: type friction C <-> scheme

[Matt Wette <matt.wette@gmail.com>]

> On Jun 9, 2017, at 2:39 PM, Catonano <catonano@gmail.com> wrote:
> 
> 
> 
> 2017-06-09 22:56 GMT+02:00 Matt Wette <matt.wette@gmail.com <mailto:matt.wette@gmail.com>>:
>  
> I think your outcome-ptr should be (bytevector->pointer (make-bytevector (sizeof unsigned-int)))
> 
> Thank you, Matt
> 
> The reason why I wrote it that way is because the previous function (freexl_open) takes a pointer (a handler) and then more or less arbitrarily allocates stuff onto it
> 
> The handler is meant to be passed as an argument to subsequent calls to the other funtiions of the library
> 
> So I tought that the same would have happened with this outcome thing
> 
> Maybe I'm wrong
> 
> I'll think about this tomorrow, too
> 
> Thank you very much for your suggestion ! 

I think Mike caught your real error: you were passing (list ‘* ‘int ‘*) and it wants (list ‘* int ‘*).  `int’ is a variable defined by guile.

scheme@(guile-user)> (use-modules (system foreign))
scheme@(guile-user)> int
$1 = 8