[MacRuby-devel] Pointers for BOOL types

[Dr Nic Williams]

Sweet, thanks.

On Fri, Jan 2, 2009 at 12:37 PM, Lachie <lachiec at gmail.com> wrote:
> Hey Nic
>
> Cheque it: http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/ObjCRuntimeGuide/Articles/chapter_7_section_1.html#//apple_ref/doc/uid/TP40008048-CH100-SW1
>
> :lachie
> http://smartbomb.com.au
> http://www.flickr.com/photos/lachie/
>
>
>
> On Fri, Jan 2, 2009 at 1:04 PM, Dr Nic Williams <drnicwilliams at gmail.com> wrote:
>> Ah, thanks.
>>
>> I've looked thought the src now, and it seems _C_ID and _C_BOOL might
>> correspond to "@" and "B" but I can't find where they are defined; not
>> in macruby src nor in Cocoa Dev Documentation.
>>
>> Where is the list of available Pointer types + their character code?
>>
>> Cheers
>> Nic
>>
>> On Fri, Jan 2, 2009 at 10:15 AM, Vincent Isambart
>> <vincent.isambart at gmail.com> wrote:
>>>> The following doesn't work:
>>>>
>>>> framework 'Cocoa'
>>>> p1 = Pointer.new_with_type('@')
>>>> p1.assign(false)
>>>> p1[0] == false # => false, but should be true
>>>>
>>>> Then I figured I should be able to pass BOOL to -new_with_type as it
>>>> is the data type, but BOOL isn't recognised.
>>>
>>> The type for bool is upper case B. If you replace @ with B in your
>>> example it works fine.
>>>
>>> Just a little warning about pointers: they tend to forget their type
>>> if you read the value returned by a function twice. Do not try to read
>>> more than once their value (just store the value returned by #[] in a
>>> Ruby variable). However, reusing the same pointer in multiple calls
>>> seems to work fine.
>>> For example the following code:
>>> # rects was retuned by  NSLayoutManager#rectArrayForCharacterRange
>>> puts rects[0]
>>> puts rects[0]
>>>
>>> Displays:
>>> #<NSRect origin=#<NSPoint x=5.0 y=0.0> size=#<NSSize width=0.0 height=19.0>>
>>> xxxxx.rb:222:in `[]': unrecognized octype `?_?' (RuntimeError)
>>> _______________________________________________
>>> MacRuby-devel mailing list
>>> MacRuby-devel at lists.macosforge.org
>>> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
>>>
>>
>>
>>
>> --
>> Dr Nic Williams
>> iPhone and Rails consultants - http://mocra.com
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>>
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-- 
Dr Nic Williams
iPhone and Rails consultants - http://mocra.com
Fun with iPhone/Ruby/Rails/Javascript - http://drnicwilliams.com
* Surf Report for iPhone - http://mocra.com/projects/surfreport/ *