[Openmcl-devel] Using CFStrings in OpenMCL
david at david-steuber.com
Fri Dec 17 22:12:36 UTC 2004
I'm wondering if I am going about this the right way. I'm starting to
work through the Learning Carbon book, translating the C into Lisp. I
want something like the CFSTR() function that is used to turn a C
string into a CFString for use by the Core Foundation functions and
this was the closest I could come up with, partly inspired by code for
WITH-CSTRS in ccl/lib/macros.lisp:
(defun make-cfstring (str)
"Allocates a CFString object stored in a MACPTR which must be
CFRelease(d) when no longer needed."
(ccl::with-cstr (cstr str)
(#_CFStringCreateWithCString (%null-ptr) cstr
(defmacro with-cfstring ((sym str) &rest body)
"Create, use, and then release a CFString."
(let ((ret (gensym)))
`(let* ((,sym (make-cfstring ,str))
(,ret (progn , at body)))
(defmacro with-cfstrings (speclist &body body)
"Create, use, and then release CFStrings."
(ccl::with-specs-aux 'with-cfstring speclist body))
CL-USER> (with-cfstrings ((foo "foo") (bar "bar")) (print foo) (print
#<A Mac Pointer #x10DC90>
#<A Mac Pointer #x106570>
Is the above reasonable code, or am I making work for myself? I went
to the trouble because I don't want memory leaks.
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