[PD] [PD-announce] getpatchname

[Mathieu Bouchard]

On Thu, 13 Jul 2006, Jamie Bullock wrote:
> On Wed, 12 Jul 2006 20:55:56 -0400 (EDT)
> Mathieu Bouchard <matju at artengine.ca> wrote:
>> On Wed, 12 Jul 2006, Miller Puckette wrote:
>>> canvas_getcurrrent() is only valid in the context of teh new() routine...
>>> you can call it there and save the result in the instance structure if you
>>> need to refer back to it (as in this case.)
>> Yes. It seems like every GUI object has such a backpointer in its struct,
>> including msg (Ctrl+2), floatatom (Ctrl+3) and symbolatom (Ctrl+4). Why
>> not make it standard and add it to t_text ?
>
> Could you explain what you mean by 'backpointer', Google and Wikipedia 
> aren't throwing up much. I'm just trying to understand why this doesn't 
> work.

a backpointer is simply a pointer to the parent node, supposing that there 
are parent/child relationships. In Pd, this always means a t_canvas*.

what Miller said is that canvas_getcurrent() is only valid while inside 
the constructor. So you have to make a backup of the value of 
canvas_getcurrent() from inside the constructor, into the struct 
t_getpatchname.

BTW, should it be called [getpatchname] or [getcanvasname] ?

  _ _ __ ___ _____ ________ _____________ _____________________ ...
| Mathieu Bouchard - tél:+1.514.383.3801 - http://artengine.ca/matju
| Freelance Digital Arts Engineer, Montréal QC Canada