Re: [Rubycocoa-talk] Using Cocoa structs in RubyCocoa

[Eloy D. <elo...@gm...>]

Hi Alli,

Normally you'd cerate a bridge support file like so:

$ gen_bridge_metadata -f QTKit > QTKit.bridgesupport

Where -f stands for a framework name in one of the default load paths.
However, trying to wrap QTKit results in the following error:
"undefined local variable or method `trans' for <UNDEFINED> ... </ 
 >:REXML::Document"

So I guess you'd need to debug this to get it to completely wrap the  
framework.

- Eloy

On Aug 19, 2008, at 12:56 PM, Allison Newman wrote:

> Hi everyone,
>
> I'm currently having trouble with writing some code to generate a  
> Quicktime movie file.  When I wish to add an image to the file, I  
> have to create a QTTime struct.
>
> When I do this for most of the standard Cocoa structs, such as  
> NSRect, NSPoint etc, I can simply do:
>
> point = NSPoint.new(1, 2)
>
> This works.  However if I try the same idea with a QTTime:
>
> qt_time = QTTime.new(1, 10, 0)
>
> RubyCocoa dies, claiming it doesn't know the constant QTTime.
>
> I have tried looking inside the RubyCocoa framework to see how the  
> magic is done for the NSxxxx structs, but I found the following  
> comment in oc_types.rb:
>
> # This module adds syntax-sugar APIs on top of the Cocoa structures.
> # This is mostly to preserve backwards compatibility with previous  
> versions
> # of RubyCocoa where the C structures support was hardcoded in the  
> bridge.
> # Now structures are automatically handled via the metadata  
> mechanism, but
> # the API is not compatible with what we used to have.
>
> If I understand correctly, this means that QTKit has not had  
> metadata generated for it to handle things such as structs etc.  Can  
> anyone confirm that this is the case, and if so, point me in the  
> direction of some documentation explaining how it is done.  With a  
> bit of luck, I'll even be able to add the QTKit metadata back into  
> the RubyCocoa project.
>
> Thanks for any help.
>
> Alli
>
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