[Openmcl-devel] More confusion about cocoa constants

Neil Baylis neil.baylis at gmail.com
Fri Jul 10 16:47:54 UTC 2009


In addition to the problem I previously mentioned re # 
$kCAGravityCenter at compile time, I'm running into other difficulties  
with constants. Is there something more I need to do other than  
loading the framework?

This is a session from the IDE listener window:

Welcome to Clozure Common Lisp Version 1.4-dev-r12363M-trunk   
(DarwinX8664)!
CL-USER> (objc:load-framework "QuartzCore" :quartzcore)
NIL
CL-USER> #$kCAGravityCenter
 > Error: Constant not found: X86-DARWIN64::|kCAGravityCenter|
 > While executing: CCL::LOAD-OS-CONSTANT, in process Listener(6).
 > Type cmd-. to abort, cmd-\ for a list of available restarts.
 > Type :? for other options.
CL-USER> #&kCAGravityCenter
#<NS-MUTABLE-STRING "center" (#x7FFF704F3AC0)>
CL-USER> #$kCAConstraintMidx
 > Error: Constant not found: X86-DARWIN64::|kCAConstraintMidx|
 > While executing: CCL::LOAD-OS-CONSTANT, in process Listener(6).
 > Type cmd-. to abort, cmd-\ for a list of available restarts.
 > Type :? for other options.
CL-USER> #&kCAConstraintMidx
 > Error: Foreign variable "kCAConstraintMidx" not found
 > While executing: CCL::%LOAD-VAR, in process Listener(6).
 > Type cmd-. to abort, cmd-\ for a list of available restarts.
 > Type :? for other options.
CL-USER>  #$NSBackingStoreBuffered
2
CL-USER>

It's very confusing trying to find the correct syntax for init forms.  
How do I know beforehand whether to use the #$ or #& prefix for a  
constant? It seems very unintuitive. Why is kCAGravityCenter defined,  
but kCAConstraintMidx is not, when they are both from the same  
framework? (They are defined in different header files).

Neil



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