mem-ref
Syntax
— Accessor:
mem-ref ptr type &optional offset ⇒ object
Arguments and Values
- ptr
- A pointer.
- type
- A foreign type.
- offset
- An integer (in byte units).
- object
- The value ptr points to.
Description
Examples
CFFI> (with-foreign-string (ptr "Saluton")
(setf (mem-ref ptr :char 3) (char-code #\a))
(loop for i from 0 below 8
collect (code-char (mem-ref ptr :char i))))
⇒ (#\S #\a #\l #\a #\t #\o #\n #\Null)
CFFI> (setq ptr-to-int (foreign-alloc :int))
⇒ #<A Mac Pointer #x1047D0>
CFFI> (mem-ref ptr-to-int :int)
⇒ 1054619
CFFI> (setf (mem-ref ptr-to-int :int) 1984)
⇒ 1984
CFFI> (mem-ref ptr-to-int :int)
⇒ 1984
See Also
mem-aref