hi thanks for your help. i checked out nopoly4 and polypoly, but they both seem to be abstractions and are not very helpful in my case. i need a working solution that prevents the user from creating more than one instance of an external i'm writing. thanks anyway olli

CC: pd-dev@iem.at From: hans@eds.org Subject: Re: [PD-dev] allow only one instance of external object Date: Sat, 22 Mar 2008 23:43:23 -0400 To: ladataxi@hotmail.de

Check out nqpoly4 or polypoly, they are both included in Pd-extended and in SVN..hc On Mar 22, 2008, at 11:33 PM, best boy wrote: hi is there a way to keep track of the number of opened instances of an external? if so, can anyone point me to an example object? thanks olli

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Hi,

Try this:

----------------------------------------

#include "m_pd.h"

static t_class *counter_class; static int instance;

typedef struct _counter { t_object x_obj; } t_counter;

static void *counter_new(t_symbol *s, t_int argc, t_atom *argv) { t_counter *x = (t_counter *)pd_new(counter_class); instance++; post("Instance %d", instance); return (void *)x; }

static void counter_free(t_counter *x){ instance--; }

void counter_setup(void) { counter_class = class_new(gensym("counter"), (t_newmethod)counter_new, (t_method)counter_free, sizeof(t_counter), CLASS_DEFAULT, 0);

instance = 0; }

-------------------------

That implements Claude's suggestion, and definitely works. If your external still crashes, then perhaps think about debugging it:

http://puredata.info/docs/developer/DebuggingPdExternals

Jamie

-- www.postlude.co.uk

On Mon, 2008-03-24 at 00:07 +0400, best boy wrote:

hi yes, it's for an external i'm writing. i tried the global counter variable thing you recommended and it works, except for when the first instance is duplicated, or copy/pasted in a patcher. this crashes pd.

do you, or anyone else, know of a working example of the global counter variable thing?

thanks olli

...

Date: Sun, 23 Mar 2008 10:43:36 +0000 From: claudiusmaximus@goto10.org To: ladataxi@hotmail.de CC: pd-dev@iem.at Subject: Re: [PD-dev] allow only one instance of external object

best boy wrote:

...

hi is there a way to keep track of the number of opened instances of

an

...

...

external?

Is this an external you are writing? Then yes. Otherwise there's

weird

...

tricks you can probably do to keep track, but not control.

...

if so, can anyone point me to an example object?

Just have a global counter variable that you initialise to 0 in foo_setup(), and in foo_new() you increment it, and in foo_free()

you

...

decrement it.

...

thanks olli

Claude

http://claudiusmaximus.goto10.org

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