* oleg harput CADvZWFL1TxpgbO9OzkJCwgDbXmKgB3TLwpeA7711tykgXH+npA@mail.gmail.com Wrote on Thu, 8 Jun 2023 17:05:29 +0300
Hi. I want to use the following C function:
;; void ClearBackground(Color color);
[snip]
(cffi:defcstruct %color (r :uint8) (g :uint8) (b :uint8) (a :uint8))
(defvar *%lightgray* (cffi:foreign-alloc '(:struct %color)))
;; void ClearBackground(Color color); (cffi:defcfun ("ClearBackground" %clear-background) :void (color (:struct %color)))
(defun clear-background (color) (%clear-background color))
But when i run
(clear-background *%lightgray*)
You are passing a pointer to a function which takes a struct by value. you should be trying
``` (clear-background (cffi:mem-ref *%lightgray* '(:struct %color))) ```
That does not work, I have already added my .asd file ":cffi-libffi" as dependency.
What is the problem? If this issue has no solution, is there an alternate way?
Does the proposed form? If it does not, please follow up.
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