sjwarner

I'll try and state my problem as concisely as possible, so please excuse the bullet points!

 is a pointer to the current instance of 

 is used to store a user set name unique to each instance of 

 is "test", the line of code below allows me to associate the symbol "test" with that instance

 of an instance is also "test", the lines below should get me to output the server object's 

t_example_a *server = (t_object*)b->b_id->s_thing;outlet_list(b->out, NULL, 1, &server->data);

 as a pointer to the server object is ok, but any attempt to access data causes max to crash with a BAD_ACCESS exclusion: KERN_PROTECTION_FAILURE

- I'm pretty new to object orientated programming, but as far as I can work out, 

 is protecting its variables, so an attempt to access that memory from an outside object will make the system fall over. I've been reading up on class friendship and the like so my question is, how do I apply that here, or is there a better way to solve my problem?

- t_symbol a_id is declared in the struct for object example_a (the server)
- long a_data is also declared in the struct
- a is a pointer to the current instance of example_a
- a->a_id is used to store a user set name unique to each instance of example_a
- if the a_id of an instance of example_a is "test", the line of code below allows me to associate the symbol "test" with that instance

- t_symbol b_id is declared in object t_example_b (the client)
- as above b->b_id also takes a user set name
- so if b_id of an instance is also "test", the lines below should get me to output the server object's a_data variable:

- setting server as a pointer to the server object is ok, but any attempt to access data causes max to crash with a BAD_ACCESS exclusion: KERN_PROTECTION_FAILURE
- I'm pretty new to object orientated programming, but as far as I can work out, t_example_a is protecting its variables, so an attempt to access that memory from an outside object will make the system fall over. I've been reading up on class friendship and the like so my question is, how do I apply that here, or is there a better way to solve my problem?

accessing-memory-held-by-other-objects

Cheers for that HTH, makes perfect sense. The link to Tim Place's blog is exactly what I needed as well.

BTW server->data was indeed a typo - I meant server->a_data.

accessing memory held by other objects