Thanks Seb! Very much appreciate the detailed explanation.

I managed to get it working with your advice.

Here's a demonstrative case:

#include "m_pd.h"

static t_class *demo_class;

typedef struct _demo {
    t_object x_obj;
    t_glist *mycanvas;
} t_demo;

void demo_bang(t_demo *x) {
    t_atom av[4];
    SETFLOAT(av + 0, (t_float)300);
    SETFLOAT(av + 1, (t_float)10);
    SETSYMBOL(av + 2, gensym("r"));
    SETSYMBOL(av + 3, gensym("test"));
    pd_typedmess((t_pd *)x->mycanvas, gensym("obj"), 4, av);
}

void *demo_new(void) {
    t_demo *x = (t_demo *)pd_new(demo_class);
    x->mycanvas = canvas_getcurrent();
    return (void *)x;
}

void demo_setup(void) {
    demo_class = class_new(gensym("demo"), (t_newmethod)demo_new, 0,
                           sizeof(t_demo), CLASS_DEFAULT, 0);
    class_addbang(demo_class, demo_bang);
}

Thanks for your reply, Seb,

Despite your advice, I'm still not sure what the correct way to go about it. The following segfaults.

    t_glist *mycanvas = canvas_getcurrent();
    t_atom av[4];
    SETFLOAT(av+0, (t_float)300);
    SETFLOAT(av+1, (t_float)10);
    SETSYMBOL(av+2, gensym("r"));
    SETSYMBOL(av+3, gensym("test"));
    pd_typedmess((t_pd *)mycanvas->gl_owner, gensym("obj"), 4, av);

Any further tips would be much appreciated.

It's pretty straightforward to send messages to objects in a c external using functions like pd_typedmess (e.g pd_typedmess((t_pd *)gensym("pd")->s_thing, gensym("dsp"), 1, argv) ).

But is there a canonical way to send object creation messages to the parent canvas: for example (msg 300 10 bang)?

@bocanegra Great stuff. Love the rapid iteration. Version 2 vanilla is much better! Thanks for sharing your sweet drum abstractions.

@bocanegra I converted your addperc abstraction / demo to vanilla puredata (attached). It was worth the effort because it sounds amazing

addperc-vanilla.zip

@bocanegra no worries. Thanks for the explanation. Looks pretty straightforward to fix then.

@bocanegra, addperc works nicely (and sounds great) in Pd-l2ork but not in vanilla. In the latter I get the following errors:

0-sqt: no such object
0-range: no such object
0-vcof: no such object
0-vcor: no such object
0-vcoa: no such object
0-mixg: no such object
0-mixr: no such object
0-mixa: no such object
0-shape: no such object
0-bpf: no such object
0-bpq: no such object
0-hpf: no such object
0-lpf: no such object
0-ega: no such object
0-egr: no such object