Re: [MacRuby-devel] How to use custom C struct's?
When MacRuby's FFI support is more mature, declaring an FFI::Struct subclass like this will be another option. class MapPoint FFI::Struct layout :row, :int, :col, :Int end You instantiate an FFI::Struct with a pointer. I'm hacking away on a Ruby interface to a C library, and I'm slinging around pointers, structs and unions with ease on MRI 1.8.6, 1.9.1 and JRuby. Best, Jeremy On Wed, Aug 5, 2009 at 8:41 AM, Eloy Duran eloy.de.en...@gmail.com wrote: Hi, On Aug 5, 2009, at 5:31 PM, Clay Bridges wrote: The google didn't yield much guidance on this. Before I started a deep-dive on the MacRuby source, and/or the standard ruby way to handle this sort of thing, I thought I would ask a couple of questions: 1) Any easy advice? Yes, use RubyCocoa 2) Is this different in MacRuby than in ruby proper? RubyCocoa at least allows you to use BridgeSupport which would allow you to map these. Afaik MacRuby doesn't fully support it yet. 3) Any pointers into the MacRuby source that might help me? BridgeSupport needs to fully implemented. Keep in mind, MacRuby is not stable yet. HTH, Eloy ___ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel ___ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
Re: [MacRuby-devel] How to use custom C struct's?
Yes, use RubyCocoa
I'm afraid I'm already hooked. ;)
If it comes down to it, I've already put a testing-only category wrapper
around one method, e.g.
#import Cell.h
@interface Cell (TestUtil)
@property (readonly) NSArray* mapPointAsArray;
@end
@implementation Cell (TestUtil)
@dynamic mapPointAsArray;
// this method is simply for ruby-side testing
- (NSArray*) mapPointAsArray {
NSMutableArray* nsma = [[NSMutableArray alloc] initWithCapacity:2];
[nsma addObject:[NSNumber numberWithInt:mapPoint.row]];
[nsma addObject:[NSNumber numberWithInt:mapPoint.col]];
return [nsma autorelease];
}
@end
Not too much work to do it for the others. Of course, one could argue what
I'm really testing here, but the craftsman in me says it's OK.
Clay
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Re: [MacRuby-devel] How to use custom C struct's?
On Aug 5, 2009, at 8:41 AM, Eloy Duran wrote: Hi, On Aug 5, 2009, at 5:31 PM, Clay Bridges wrote: The google didn't yield much guidance on this. Before I started a deep-dive on the MacRuby source, and/or the standard ruby way to handle this sort of thing, I thought I would ask a couple of questions: 1) Any easy advice? Yes, use RubyCocoa 2) Is this different in MacRuby than in ruby proper? RubyCocoa at least allows you to use BridgeSupport which would allow you to map these. Afaik MacRuby doesn't fully support it yet. 3) Any pointers into the MacRuby source that might help me? BridgeSupport needs to fully implemented. FYI, BridgeSupport is mostly implemented in MacRuby, at least the part that deals with C structures. The only part that we didn't implement yet is C function pointers, the rest (roughly 90%) is done, and it is faster / more stable than the RubyCocoa code (you will have to believe me, since I wrote both :-)). What Clay needs to do is describe his C structures in a .bridgesupport file. You can read the BridgeSupport(5) man-page for more information. Unfortunately the gen_bridge_metadata(1) cannot generate C structures metadata without a template, and this part is not yet documented. So it may be faster to craft the .bridgesupport file by hand. There are plenty of .bridgesupport files in /System/Library/Frameworks that can be used as an example. Once the file is created, it can loaded from MacRuby using: load_bridge_support_file 'foo.bridgesupport' Laurent ___ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
Re: [MacRuby-devel] How to use custom C struct's?
On Aug 5, 2009, at 1:09 PM, Laurent Sansonetti wrote: Here is an example on how to do this automatically. [ SNIP ] Gee, if this were to go up on, say, the wiki for bridgesupport, this sort of explicit advice could help future generations too! Oh what the heck, done. http://bridgesupport.macosforge.org/trac/wiki/Documentation contains a small tutorial based on your example. Feel free to edit more to taste. :) - Jordan ___ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
Re: [MacRuby-devel] How to use custom C struct's?
Thank you, Laurent. That was *incredibly* helpful and kind of you, and worked perfectly. Being able to add MapPoint#to_a and MapPoint[row,col] methods was the oh, ruby, you *are* magic moment of it all. I was going to try to pay it back by putting it up on a wiki, but Jordan beat me to it. I LOL'd when I saw my lowly MapPoint had made it to the big time. You go, struct! Seriously, gang, as a first contact with the MacRuby community, I couldn't be more impressed. Thanks, Clay ___ MacRuby-devel mailing list MacRuby-devel@lists.macosforge.org http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel
