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Re: FFI questions

From: Matt Wette
Subject: Re: FFI questions
Date: Fri, 15 May 2020 16:59:02 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0

On 5/15/20 4:52 PM, Matt Wette wrote:
On 5/15/20 1:09 PM, Taylan Kammer wrote:

The FFI Helper is by Matt Wette who also hangs around on this mailing list I believe.

I think Taylan's suggestion on your first part is probably correct.
Bytestructures allows you to access and change structure members by name.


And by the way, the FFI Helper has a "x11-xcb.ffi" file included.
Here is the code generated for your procedure:
(My converter says this returns int not void, btw.)

;; xcb_void_cookie_t xcb_change_window_attributes(xcb_connection_t *c,
;;     xcb_window_t window, uint32_t value_mask, const void *value_list);
(define xcb_change_window_attributes
  (let ((~xcb_change_window_attributes
          (delay (fh-link-proc
                   (list ffi:unsigned-int)
                   (list ffi-void* ffi:uint32 ffi:uint32 ffi-void*)
    (lambda (c window value_mask value_list)
      (let ((~c ((fht-unwrap xcb_connection_t*) c))
            (~window (unwrap~fixed window))
            (~value_mask (unwrap~fixed value_mask))
            (~value_list (unwrap~pointer value_list)))
        ((fht-wrap xcb_void_cookie_t)
         ((force ~xcb_change_window_attributes)

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