[cffi-devel] How do i cast variables
take this for instance CvPointpoints[2]; id like to be able to cast points[2] to the CvPoint struct more info here http://docs.opencv.org/modules/core/doc/old_basic_structures.html?highlight=... here is my struct which works for other things ;; (cffi:foreign-type-size '(:struct cv-point)) = 8 (cffi:defcstruct cv-point (x :int) (y :int)) put in a defparameter you cant just go (defparameter points (cffi:foreign-alloc :int :count 2)) (defparameter a ((:struct cv-point) points)) you get an illegal function call error...any help is appreciated
On Tue, 22 Oct 2013 15:48:50 -0700 (PDT), Joeish W said:
take this for instance
CvPoint points[2];
id like to be able to cast points[2] to the CvPoint struct more info here http://docs.opencv.org/modules/core/doc/old_basic_structures.html?highlight=...
here is my struct which works for other things
;; (cffi:foreign-type-size '(:struct cv-point)) = 8 (cffi:defcstruct cv-point (x :int) (y :int))
put in a defparameter you cant just go
(defparameter points (cffi:foreign-alloc :int :count 2))
(defparameter a ((:struct cv-point) points))
you get an illegal function call error...any help is appreciated
Your example is inconsistent -- in C, your points variable is an array of two CvPoints, but in Lisp it is an array of two ints. What are you really trying to do? I suggest you post the C code that you are trying to convert. The opencv doc for CvPoint doesn't use casting or arrays of ints. __Martin
participants (2)
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Joeish W -
Martin Simmons