Re: Searching dictionaries
Re: Searching dictionaries
- Subject: Re: Searching dictionaries
- From: April Gendill <email@hidden>
- Date: Fri, 10 Oct 2003 23:22:39 -0700
On Friday, October 10, 2003, at 10:44 PM, James McConnell wrote:
On 10/10/03 10:37 PM, "April Gendill" <email@hidden> wrote:
I have a data structure. The root is a dictionary which contains
string items and other dictionaries (possibly nested). I tried
enumerating the dictionary but I cannot remove an item or other wise
use it because the enumerator only provides either a string or
dictionary object.
I tried [theDict allKeysForObject:theObject];
"theObject" is a selected item from a table. Am I not understanding
what "The Object" is suppose to be? Because when I
NSLog(@"%@",[theDict
allKeysForObject:theObject]); The array is empty even though I can log
the object and the dictionary and they both show an object by the same
name. Basically I cannot step through a nested dictionary and remove
either a string or dictionary because I guess I do not understand how
to reference the data.
April.
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First, are you using NSDictionary or NSMutableDictionary? I'm not
trying to
belittle your intelligence or anything, but I've made that mistake, so
you
might want to check and make sure you're using NSMutableDictionary or
NSMutableArray to guarantee that you can delete/add/modify objects
within
the dictionary/array.
its a global mutable dictionary
Other than that, just off the top of my head, I would create some kind
of
recursive method that steps through a dictionary. Call it on your root
dictionary, then every time you encounter an object in your
dictionary, test
it and see if it's another dictionary. If it is, call the recursive
method
again on that one, and so on and so forth until you've gone through
each
one. If you have many nested dictionaries (dictionaries inside
dictionaries
inside dictionaries), you might want to take a look at your data
structure.
But since you didn't say how deep it went, that's more of a heads-up,
as I
don't know what your structure looks like.
Creating a recursive method would not be difficult for me if I have
the slightest Idea how to get the key names from an enumerator or how
to find an object in a nested dictionary.
Wish I could post some code for you, but it's late and I'm heading to
bed,
but that should get you started. Hope that helps, happy coding!
James
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