Saving data with patch


    May 24 2010 | 2:49 pm
    I'd like to save some datas of an ui external (essentially a dynamic array of longs) with the patcher, so that they are automatically restored on reload. It should be the same thing as preserving values on copy/paste, so I've seen the thread https://cycling74.com/forums/function-copypaste where emmanuel suggested to add a method
    void yourobject_jsave(t_yourobject *x, t_dictionary *d){ dictionary_appendlong(d, gensym("hey"), 74); }
    I did it: the method is correctly called, but still the message "hey" with argument 74 is never executed, neither on pasting, nor on reloading. (obviously i've also created a "hey" method, A_LONG - but it is never evaluated).
    Shouldn't the "hey 74" be parsed automatically at the object initialization with attr_dictionary_process(x, d)? Am I wrong in some part of the process?
    Thanks a lot, Daniele Ghisi

    • Jul 23 2010 | 12:25 pm
      Hi,
      Is your object a UI object?
      Cheers
    • Jul 23 2010 | 4:27 pm
      The jsave method only works for ui objects, so that's why it did not work for you.
      For non-ui objects you should instead use the appendtodictionary method. In your class definition:
      	class_addmethod(c, (method)myobj_appendtodictionary,	"appendtodictionary", A_CANT, 0);
      
      Then you can implement the method like this:
      void myobj_appendtodictionary(t_myobj *x, t_dictionary *bd)
      {
      	// bd is a dictionary for our object that is going to be stored in the patcher
      	// we can append data to the dictionary using the usual dictionary methods
      
      	t_atom a[2];
      
      	atom_setlong(a+0, 1234);
      	atom_setsym(a+1, gensym("foo"));
      
      	dictionary_appendatoms(bd, gensym("my_data"), 2, a);
      }
      
      To restore the data when the patcher is opened (and your object is created, you can get the dictionary for your object in the new method using the #D symbol like this:
      	t_dictionary *d = (t_dictionary *)gensym("#D")->s_thing;
      	if (d)
      		// do something with the dictionary, like get the atoms associated with the "my_data" key
      
      HTH, Tim
    • Jan 06 2011 | 6:42 pm
      Hey, hopefully this isn't too old but what if I want something like appendtodictionary above, but the name of the dictionary is specified by an argument to the object like a buffer? Therefore if I have multiple instantiations of the object, they each can use their own database...
      Thanks!