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
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