Hello,

If I switch those two lines around, then I get an error when compiling the external. 'f' : undeclared identifier

but Thanks for your reponse...

Regards, Dave S

----- Original Message ----- From: "Rua Haszard Morris" ruahm@yahoo.com To: "David Sabine" dave@davesabine.com Sent: Tuesday, November 19, 2002 9:07 PM Subject: Re: [PD] [epochtime] - my first external

OK I know nuthin of externals.. but...

...

void epochtime_bang(t_epochtime *x) { t_float f=x->t; x->t=time( NULL );

outlet_float(x->x_obj.ob_outlet, f); }

here, on bang 1, you output whatever is in x->t (the init value or unused memory or whatever), and then set the x->t value to the current time.

Then on bang 2, you output that time (from the previous bang), and save the current time in x->t (for next time).

try this..

...

void epochtime_bang(t_epochtime *x) { x->t=time( NULL ); // get the time & sto' in x->t t_float f=x->t; // retrieve that value to be

returned

...

outlet_float(x->x_obj.ob_outlet, f); }

--- David Sabine dave@davesabine.com wrote: > Hello all,

...

I'm exploring my very first external! But I've run into a snag.

I'd like to build an external object which outputs the number of seconds since "epoch" when banged. Epoch is the beginning of time as the digital world understands it: jan 1 1970.

Could somebody look over the following code and tell me why it works only after the FIRST BANG?

Many thanks Regards, Dave S

---

#include "m_pd.h" #include "time.h"

static t_class *epochtime_class;

typedef struct _epochtime { t_object x_obj; time_t t; } t_epochtime;

void epochtime_bang(t_epochtime *x) { t_float f=x->t; x->t=time( NULL );

outlet_float(x->x_obj.ob_outlet, f); }

void *epochtime_new(t_floatarg f) { t_epochtime *x = (t_epochtime *)pd_new(epochtime_class);

x->t=f; outlet_new(&x->x_obj, &s_float);

return (void *)x; }

void epochtime_setup(void) { epochtime_class = class_new(gensym("epochtime"), (t_newmethod)epochtime_new, 0, sizeof(t_epochtime), CLASS_DEFAULT, 0);

class_addbang(epochtime_class, epochtime_bang); }

===== Rua Haszard Morris Software Engineer & Research Assistant MARCS Auditory Laboratories http://www.uws.edu.au/marcs/

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