[MacRuby-devel] Getting a pointer to a boxed type

[Laurent Sansonetti]

Hi Mark,

I think the following would work:

	value =  valueOfAttribute attribute
	point_ptr = Pointer.new(CGPoint.type)
	AXValueGetValue( value, KAXValueCGPointType, point_ptr )
	point = point_ptr[0]

Basically, you want to pass a pointer to a CGPoint to the API.

Laurent

On Dec 1, 2010, at 10:16 PM, Mark Rada wrote:

> Hi,
> 
> With the recent closing of ticket #1002 I have been trying to take a bunch of Objective-C code and write it in MacRuby.
> 
> One problem that I have run into is with the AXValueGetValue() function in AXValue.h. The last argument to the function is supposed to be the address of a structure to populate; a fragment of that code would look like this:
> 
> 	AXValueRef value = (AXValueRef)[self valueOfAttribute:attribute];
> 	CGPoint point;
> 	AXValueGetValue( value, kAXValueCGPointType, &point );
> 	return point;
> 
> If I wanted to write this in MacRuby I think I would have to do something like this:
> 
> 	value =  valueOfAttribute attribute
> 	point = CGPoint.new
> 	AXValueGetValue( value, KAXValueCGPointType, point.address_of )
> 	point
> 
> Except that I have not come across a way to get the address of an object in MacRuby. I have tried the #object_id but then I get errors about the function wanting a Pointer.
> 
> Is there a way to get a pointer to a specific object or a way to get the address of an object?
> 
> Thanks,
> 	Mark
> 
> _______________________________________________
> MacRuby-devel mailing list
> MacRuby-devel at lists.macosforge.org
> http://lists.macosforge.org/mailman/listinfo.cgi/macruby-devel

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