Hi Laurent,Thanks for the explanation.
A related question: how to get the "main/self" object of the macruby
runtime?
On Mon, Jul 27, 2009 at 6:50 AM, Laurent Sansonetti
<lsansone...@apple.com>wrote:
> Hi Linan,
>
> You can't really assign a Ruby local variable from Objective-C, since Ruby
> locals are generally scoped around a particular method, but you can assign
> to an instance variable of a given object, a constant, a global variable (or
> eventually a class variable, but this is evil, don't try that).
> Additionally, you can evaluate a local variable assignment of a given
> Binding object from Objective-C, but this becomes hardcore.
>
> A simple example, setting an instance variable of an object created from a
> Ruby class from Objective-C:
>
> $ cat /tmp/t.m
> #import <MacRuby/MacRuby.h>
>
> int main(void)
> {
> [[MacRuby sharedRuntime] evaluateString:@"class Foo; def foo; @foo;
> end; end"];
> id obj = [NSClassFromString(@"Foo") new];
> NSLog(@"-> %@", [obj performRubySelector:@selector(foo)]);
> [obj performRubySelector:@selector(instance_variable_set:)
> withArguments: @"@foo", @"hello", nil];
> NSLog(@"-> %@", [obj performRubySelector:@selector(foo)]);
> [obj performRubySelector:@selector(instance_variable_set:)
> withArguments: @"@foo", @"world", nil];
> NSLog(@"-> %@", [obj performRubySelector:@selector(foo)]);
> }
>
> $ gcc /tmp/t.m -o /tmp/t -fobjc-gc -framework MacRuby -framework Foundation
>
> $ /tmp/t
> 2009-07-26 22:48:29.366 t[53439:903] -> <null>
> 2009-07-26 22:48:29.368 t[53439:903] -> hello
> 2009-07-26 22:48:29.369 t[53439:903] -> world
>
> HTH,
> Laurent
>
>
> On Jul 26, 2009, at 5:10 PM, Linan Wang wrote:
>
> Hi everybody,
>> I'm trying to migrate from FScript to MacRuby. The problem I'm facing now
>> is how to assign values to variables in the macruby runtime with objc codes.
>> In Fscript framework, it's fairly straightforward: setObject:forIdentifier
>> call of FSInterpreter.
>> I've tried rb_define_varible but it does not work. seems it requires
>> rb_objc_ocval_to_rval function call to convert the objc object to ruby
>> object first. Any help is appreciated. Thanks
>>
>> --
>> Best regards
>>
>> Linan Wang
>> _______________________________________________
>> 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
>
--
Best regards
Linan Wang
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