[Openmcl-devel] Missing framework constants

Ron Garret ron at awun.net
Tue Jul 15 20:19:45 UTC 2008


On Jul 15, 2008, at 12:53 PM, R. Matthew Emerson wrote:

>
> On Jul 15, 2008, at 3:26 PM, Ron Garret wrote:
>
>> This doesn't work:
>>
>> ? (objc:load-framework "QTKit" :qtkit)
>> NIL
>> ? #$QTMediaTypeVideo
>>> Error: Constant not found: X86-DARWIN64::|QTMediaTypeVideo|
>>
>> Am I doing something wrong?  Other system constants seem to be there,
>> e.g.:
>>
>> ? #$NSTitledWindowMask
>> 1
>> ? #$NSJPEGFileType
>> 3
>> ?
>
> There's kind of a mismash of numeric and string constants in the  
> various frameworks, and it's often hard to tell which is which.
>
> In this case, QTMediaTypeVideo is a string constant, so you have to  
> say:
>
> ? #&QTMediaTypeVideo
> #<NS-MUTABLE-STRING "vide" (#x7FFF700CA538)>
> ?
>

Ah.  Thanks!

To alleviate my own confusion I assembled a list of ObjC-related syntax:

#$ - numerical constants
#& - string constants
#/ - ObjC methods
#@"..." - Constant ns-strings

And then ObjC classes are accessed as ns:class-name.  (Note that the  
naming conventions for classes accessed in this manner is different  
than the naming convention for methods accessed using the #/ reader  
macro.)

Did I miss anything?

rg




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