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May 24, 2010 at 2:49pm
Saving data with patch
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 http://cycling74.com/forums/topic.php?id=26378 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
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Jul 19, 2010 at 5:28am
Hello maxers,
I want to save an array of double with the patch, as CLASS_ATTR_SAVE does ;
but as i don’t know how many values : i want to use a dynamic array to collect them ; (weights of a neural network so i don’t want / need user interaction) ….
so :
- have you any clue/strategy/idea for saving that kind of stuff ? (my external is not UI).
- in case of using CLASS_ATTR_DOUBLE_ARRAY ; is it safe to deal with big size array (thousands of values) ?
Thanks.
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Jul 23, 2010 at 12:25pm
Hi,
Is your object a UI object?
Cheers
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Jul 23, 2010 at 2:22pm
Hello Timothy,
NO, that’s not an UI.
i’m doing an absurd/nut external who scan the patch and create a “neural network” with jbox and jpatcherline ; and my problem was to save synapse weights with the patcher.
Finally i start to do it using two CLASS_ATTR_DOUBLE_ARRAY in a very very complex approach ;-) I set the size of these arrays : 2048 ; hope that’s not too much.
Another idea (should be great, because what i’m currently doing is crazy) ?
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Jul 23, 2010 at 4:27pm
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
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Jul 24, 2010 at 10:58am
Hello Timothy,
Thank you ; much more easy to code my external now.
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Aug 26, 2010 at 8:39am
Hello maxers,
i implement a SaveDataWithPatcher stuff with Tim’s appendtodictionnary tips ; but i suspect this to crash sometimes my [papa] external (once for now freeing the patcher, but …) ; is it possible than a thread conflict between myobj_free function and myobj_appendtodictionnary function occurs as both are referring to the same data structure ? or are they called strictly one before the other ?
thanks for help.
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Jan 6, 2011 at 6:42pm
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!
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Jan 7, 2011 at 3:18pm
Hello gerladhammings,
i was not sure so i did a quick test (mac only, sources with) ; keys you add to the t_dictionary is local for each instantiation of your object so each object can use/save is own database ; Somebody to correct me ?
but the name of the dictionary is specified by an argument to the object like a buffer ?
i don’t really understand what you mean with “the name of the dictionary” ;
t_dictionary *d = (t_dictionary *)gensym("#D")->s_thing ; …
HTH
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