That's indeed the difference - a c object like "send_test_class" can't
be shared beteen different object modules loaded separately into Pd. This
is one reason people have sometimes put multiple externals into a single
object file.
You could have both externs have the same "family name" (like
"array define" and "array set") - then they can both be defined in the
same C object file "binarytree.[extent]".
cheers
Miller
On Tue, Jan 19, 2021 at 11:38:22AM -0800, Eric Lennartson wrote:
> Hello all,
>
> I've been working on trying to send data between different externals, but
> I'm not doing something quite right. I've looked at the code in d_global.c
> as well as for send and receive.
> The only difference I can see is that mine is not all in the same .c file
> while in the pd source it is.
>
> Here's the external with the data. Just an int for now, but it will be
> holding a binary tree later.
>
> static t_class *send_test_class;
> typedef struct _send_test {
> t_object x_obj;
> t_symbol* name;
> int value;
> }t_send_test;
>
> static void *send_test_new(t_symbol *s, t_floatarg f) {
> t_send_test *x = (t_send_test *)pd_new(send_test_class);
> x->name = s;
> x->value = f;
> pd_bind(&x->x_obj.ob_pd, s); // bind to the name we're given
> post("send_test created with name %s, and value %d", x->name->s_name,
> x->value);
> return(x);
> }
>
> static void send_test_free(t_send_test *x) {
> pd_unbind(&x->x_obj.ob_pd, x->name); // unbind when deleted
> }
>
> void send_test_setup(void) {
> send_test_class = class_new(gensym("send_test"),
> (t_newmethod)send_test_new,
> (t_method)send_test_free,
> sizeof(t_send_test),
> CLASS_NOINLET,
> A_DEFSYM,
> A_DEFFLOAT,
> 0);
> }
>
> And here's the receiver.
>
> static t_class *send_test_class;
>
> static t_class *rcv_test_class;
>
> typedef struct _send_test {
> t_object x_obj;
> t_symbol* name;
> int value;
> }t_send_test;
>
> typedef struct _rcv_test {
> t_object x_obj;
> t_symbol* name;
>
> int value;
> } t_rcv_test;
>
> static void *rcv_test_new(t_symbol *s) {
> t_rcv_test *x = (t_rcv_test *)pd_new(rcv_test_class);
> x->name = s;
> t_send_test* sender = (t_send_test*)pd_findbyclass(x->name,
> send_test_class);
>
> x->value = sender->value;
> post("sender value is %d", sender->value);
> post("rcv_test created with name %s, and value %d", x->name->s_name,
> x->value);
> return(x);
> }
>
> static void rcv_test_free(t_rcv_test *x) {}
>
> void rcv_test_setup(void) {
> rcv_test_class = class_new(gensym("rcv_test"),
> (t_newmethod)rcv_test_new,
> (t_method)rcv_test_free,
> sizeof(t_rcv_test),
> CLASS_NOINLET,
> A_DEFSYM,
>
> 0);
> }
>
> What exactly is it that I'm doing wrong?
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