Re: [Rubycocoa-talk] valueForKey:@"changed" == @"YES" ??? (ObjC vs. RubyCocoa strings ?)

[kimura wataru<ki...@us...>]

Hi,

In Objective-C, "==" operator for Cocoa objects tests by address. We
can test values of strings with "isEqualToString:" method.

I guess the objc compiler makes same address to literal string @"YES".


Rupert BARROW wrote:
>Hi,
>
>I've been spending most of the night trying to understand the  
>following problem :
>

>When I run the program, the traces from the Objective-C code show :
>
>	record changed=YES, class=NSCFString, res=(null)
>	record changed=YES, class=NSCFString, res=(null)
>	record changed=YES, class=NSCFString, res=(null)
>	record changed=YES, class=NSCFString, res=(null)
>	record changed=YES, class=NSCFString, res=(null)
>	changedRecords=()
>
>What is going on ?  I have made every effort for the two ObjC and  
>RubyCocoa strings be equal : same value ("YES"), same class  
>(NSCFString); what else ?  Why does the test
>		if ([record valueForKey:@"changed"] == @"YES")
>never verify ?
>
>
>Thanks for any help, I'm going to bed    %:(
>Rup
>