Alexis Baskind

everything is in the title: I'd like to know how to create a buffer on the fly using the sdk, and how to change its size in a safe way. The two examples in the SDK related to buffers (index~ and simpwave~) teach how to read inside preexisting buffers, but not how to create buffers or change its size without requiring an extra buffer~ instance.

A nasty way would be to use patcher scripting, but I'd like to avoid that if possible.

how-to-create-a-buffer-and-change-its-size

It's not necessarily nasty ;-) that's how 

 works, it creates an embed patcher with a bunch of 

It's not necessarily nasty ;-) that's how polybuffer~ works, it creates an embed patcher with a bunch of buffer~ in it.


Thanks for the tip: I indeed did not think about creating a embedded invisible patcher for this purpose. By "nasty" I was meaning creating a buffer in the parent patcher and dealing with it.

So I guess I have to get a closer look at the "scripto"' example to learn how to create a new jpatcher instance, something like this:

x->s_patcher = (t_object *)object_new_typed(CLASS_NOBOX,gensym("jpatcher"),1, &a);

You can also create a buffer just like this

    t_atom a;
    atom_setsym(&a, gensym("toto"));
    t_object *b = object_new_typed(CLASS_BOX, gensym("buffer~"), 1, &a);
    atom_setsym(&a, gensym("anton.aif"));
    typedmess(b, gensym("replace"), 1, &a);



You can also create a buffer just like this


	t_atom a;
	atom_setsym(&a, gensym("toto"));
	t_object *b = object_new_typed(CLASS_BOX, gensym("buffer~"), 1, &a);
	atom_setsym(&a, gensym("anton.aif"));
	typedmess(b, gensym("replace"), 1, &a);



Thanks, that's quite helpful. Actually your last solution is the most straightforward equivalent in the new API of the old "newinstance" function. And then, no need for a patcher in my case since I have only one object (this buffer).

how to create a buffer and change its size