Re: GSObjCFindVariable

[Dr. H. Nikolaus Schaller]

Am 13.06.2010 um 18:50 schrieb address@hidden:

> Hi!
>
> typedef struct Foo
> {
> int x;
> double y;
> }
> Foo;
>
> @interface Brak : NSObject
> {
> Foo mFoo;
> }
> @end
>
> I would like to know if it is to possibe to get the correct offset  
> to the "x" or "y" field in the "mFoo" member of "Brak" using  
> GSObjCFindVariable or some similar function. It would be pretty cool  
> if I could set selected struct fields inside an instance by using  
> GSObjCSetVariable. AFAIK the struct types are encoded, so the  
> information should be there.

Well, you can get the address/offset of the mFoo struct. And then use  
standard-C to access components within the struct Foo.

I.e. something like

void *addr=/* get address of mFoo through GSObjCFindVariable */
((struct Foo *) addr)->y = 3.1415;

But AFAIK there is no KVC approach for struct type iVars (i.e. [obj  
valueForKey:@"mFoo.y"] ).

Nikolaus