Re: NSDictionary question - SOLVED

FROM : Miguel Arroz
DATE : Tue Nov 23 20:35:50 2004

Hi!

  As some people noted, the problem was that I needed to define the 
hash method for the CSCardDistanceIndex class... :-/ Some thousand 
lines of code later and I'm still a Cocoa newbie!

  Thanks for the help

Miguel Arroz


On 23 de nov de 2004, at 12:15, Miguel Arroz wrote:

> Hi!
>
>  I saw that, but that does not mean the objects are found using 
> isEqual, it just means that it uses isEqual to make sure the keys are 
> not the same.
>
>  My problem is that I have one key that I know it's there, but 
> objectForKey does return nil. I'm doing this to test:
>
>     CSCardDistanceIndex *indexx = [[[CSCardDistanceIndex alloc] init] 
> autorelease];
>     [indexx setCard1:card1];
>     [indexx setCard2:card2];
>     
>     NSArray *keys = [distanceList allKeys];
>     int a;
>     for( a = 0; a < [keys count]; a++ ) {
>         NSLog(@"-> %@", [keys objectAtIndex:a]);
>         if( [indexx isEqual:[keys objectAtIndex:a]] ) {
>             NSLog( @"OLA1" );
>             CSCardDistance *d1 = [distanceList objectForKey:indexx];
>             NSLog( @"OLA2" );
>             CSCardDistance *d2 = [distanceList objectForKey:[keys 
> objectAtIndex:a]];
>             if( d1 == nil || d2 == nil ) {
>                 NSLog(@"HEY");
>             }
>         }    
>     }
>
>  I have set the debugger to stop in the NSLog(@"Hey") line. When it 
> stops, d1 is nil and d2 is the object i want! What is REALLY strange 
> os that it stops! So, indexx isEqual to the key in the allKeys array 
> (or else, the first "if" would fail) but the dictionary cannont find 
> the objcect using that key.
>
>  Even more amazing, I have a NSLog line on the isEqual method, and 
> between OLA1 and OLA2 the isEqual method is NOT called! I am 
> absolutely sure the keys are OK (i have printed the dicitionary 
> description, and all the keys are CSCardDistanceIndex instances). I 
> really don't know what's going on... I spent almost 5 hours trying to 
> find this bug, with no luck.
>
>  Yours
>
> Miguel Arroz
>
> On 23 de nov de 2004, at 3:09, Andreas Mayer wrote:
>

>>
>> Am 23.11.2004 um 03:39 Uhr schrieb Miguel Arroz:
>>

>>>  A simple question... how does an NSDictionary compare the keys? 
>>> Does it use isEqual, or is it just a simple comparation (using ==)?

>>
>> What about checking the documentation?
>>
>> <http://developer.apple.com/documentation/Cocoa/Reference/Foundation/

>> ObjC_classic/Classes/NSDictionary.html>
>>
>> "That is, no two keys in a single dictionary are equal (as determined 
>> by isEqual:)."
>>
>>
>> Andreas
>>
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>>
>>

>
>      "I felt like putting a bullet between
>        the eyes of every Panda that wouldn't
>        scr*w to save its species."      -- Fight Club
>
>  Miguel Arroz - <email_removed> - http://www.guiamac.com
>
> _______________________________________________
> MacOSX-dev mailing list
> <email_removed>
> http://www.omnigroup.com/mailman/listinfo/macosx-dev
>
>


      "I felt like putting a bullet between
        the eyes of every Panda that wouldn't
        scr*w to save its species."      -- Fight Club

  Miguel Arroz - <email_removed> - http://www.guiamac.com