[PD-dev] why some structs are defined in m_obj.c? + what are vinlets and voutlets?

[Henri Augusto Bisognini]

Thanks a lot for the info Christof, IOhannes and Miller. Everything is starting to make sense :)

Is there any kind of document containing development guidelines or an explanation of the inner workings of PD?

The closest i could find is the ChangeLog.txt (which contained precious information that really helped me get started) in the "original source notes" section .
<https://github.com/pure-data/pure-data/blob/master/src/CHANGELOG.txt#L135>

Cheers,
Henri.

________________________________
De: Christof Ressi <christof.ressi at gmx.at>
Enviado: terça-feira, 20 de novembro de 2018 15:29
Para: Henri Augusto Bisognini
Cc: pd-dev at lists.iem.at
Assunto: Aw: [PD-dev] why some structs are defined in m_obj.c? + what are vinlets and voutlets?

Hi,

you can actually use obj_starttraverseoutlet() to traverse the outlets like this:

// x is your object
t_outlet *outlet;
int nout = obj_noutlets(x);
for (int i = 0; i < nout; ++i){
    obj_starttraverseoutlet(x, &outlet, i);
    // do something with outlet
}

obj_starttraverseoutlet returns the connections from this outlet to other ojects (which you can traverse with obj_nexttraverseoutlet), but it also gives you the outlet via the second parameter (a t_outlet** so it can change your t_outlet* to point to the right outlet).

note that those functions are not part of the public API, so use with caution.

Christof


Gesendet: Dienstag, 20. November 2018 um 17:37 Uhr
Von: "Henri Augusto Bisognini" <msndohenri at hotmail.com>
An: "pd-dev at lists.iem.at" <pd-dev at lists.iem.at>
Betreff: [PD-dev] why some structs are defined in m_obj.c? + what are vinlets and voutlets?

Hi.

I'm starting to dwelve into pd's C side of things. I'm having a really hard time figuring stuff out. (i have mainly experience with more high-level languages like Java, etc)

I'm trying to experiment with some editor features and i've been wandering:

why the _inlet and _outlet structures are defined in m_obj.c instead of m_pd.h ?

This way i can't access the structure members. I'm trying to traverse an t_object's t_outlets linked list but

t_outlet *o = selected_object->te_outlet;
o = o->o_next;
but this throws me an "dereferencing incomplete type" error since there is no definition for t_outlet inside m_pd.

 The same goes for accessing members of t_outconnect for example, but there are two methods that allows you to traverse the connections linked list
obj_starttraverseoutlet()       (m_imp.h)(m_obj.c)
obj_nexttraverseoutlet()       (m_imp.h)(m_obj.c)


But i couldn't find any method to traverse an t_object's linked list of t_outlets. The only three methods that seems to return t_outlets pointers are

t_outlet *outlet_new(t_object *owner, t_symbol *s)                                       (m_obj.c)
t_outlet *canvas_addoutlet(t_canvas *x, t_pd *who, t_symbol *s)              (g_graph.c)
and
t_outlet *voutlet_getit(t_pd *x)        (g_io.c)
which i currently do not understand but doesn't seem to be what i'm looking for.

How could i traverse from, lets say the g_editor.c file, all the t_inlets and t_outlets of an t_object?

Btw, on a second question, what exactly are vinlets and voutlets?

Cheers,
Henri._______________________________________________ Pd-dev mailing list Pd-dev at lists.iem.at https://lists.puredata.info/listinfo/pd-dev
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