puredata/6.externs/obj1.c

   1 /* code for "obj1" pd class.  This takes two messages: floating-point
   2 numbers, and "rats", and just prints something out for each message. */
   3
   4 #include "m_pd.h"
   5
   6     /* the data structure for each copy of "obj1".  In this case we
   7     on;y need pd's obligatory header (of type t_object). */
   8 typedef struct obj1
   9 {
  10   t_object x_ob;
  11 } t_obj1;
  12
  13     /* this is called back when obj1 gets a "float" message (i.e., a
  14     number.) */
  15 void obj1_float(t_obj1 *x, t_floatarg f)
  16 {
  17     post("obj1: %f", f);
  18 }
  19
  20     /* this is called when obj1 gets the message, "rats". */
  21 void obj1_rats(t_obj1 *x)
  22 {
  23     post("obj1: rats");
  24 }
  25
  26     /* this is a pointer to the class for "obj1", which is created in the
  27     "setup" routine below and used to create new ones in the "new" routine. */
  28 t_class *obj1_class;
  29
  30     /* this is called when a new "obj1" object is created. */
  31 void *obj1_new(void)
  32 {
  33     t_obj1 *x = (t_obj1 *)pd_new(obj1_class);
  34     post("obj1_new");
  35     return (void *)x;
  36 }
  37
  38     /* this is called once at setup time, when this code is loaded into Pd. */
  39 void obj1_setup(void)
  40 {
  41     post("obj1_setup");
  42     obj1_class = class_new(gensym("obj1"), (t_newmethod)obj1_new, 0,
  43         sizeof(t_obj1), 0, 0);
  44     class_addmethod(obj1_class, (t_method)obj1_rats, gensym("rats"), 0);
  45     class_addfloat(obj1_class, obj1_float);
  46 }
  47