Re: Help, writing kawa equivalent of java program

[Vasantha Ganesh <vasanthaganesh.k@gmail.com>]

Hello,
  It worked after making it a method and then making the method abstract.

Code for future users?

(define-alias library com.sun.jna.Library)
(define-alias native com.sun.jna.Native)

(define-simple-class libc (library)
  interface: #t
  ((getpid)::long #!abstract))

(define inst::libc (native:loadLibrary "c" libc:class))
(display (inst:getpid))


Thanks a lot!
Vasantha Ganesh K.

On Sun, Apr 2, 2017 at 1:55 AM, Per Bothner <per@bothner.com> wrote:
> On 04/01/2017 01:20 PM, Sudarshan S Chawathe wrote:
>>>
>>> (define-alias library com.sun.jna.Library)
>>> (define-alias native com.sun.jna.Native)
>>>
>>> (define-simple-class libc (library)
>>>   interface: #t
>>>   (getpid::long))
>>>
>>> (define inst::libc (native:loadLibrary "c" libc:class))
>>> (display (inst:getpid))
>>
>>
>> I think you need to define the interface to have a getpid method with
>> the proper signature.  Here is a small example, somewhat similar to your
>> code, that I tried a while back and that works:
>>
>> (define-simple-class clib (com.sun.jna.Library)
>>   interface: #t
>>   ((puts (s ::String)) ::void #!abstract))
>
>
> Kawa should be able to infer the signature, so I believe you can write:
>
>     ((puts (s)) #!abstract))
>
> The problem is that:
>    (getpid::long)
> defines a field, not a method (and non-statuc fields aren't allowed in
> interfaces).
>
> Kawa should probably catch this error.
>
> --
>         --Per Bothner
> per@bothner.com   http://per.bothner.com/