[MacRuby-devel] Pointers for BOOL types

[Dr Nic Williams]

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
>



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