Re: Question about NSScanner usage

[Richard Frith-Macdonald]

On Wednesday, January 24, 2001, at 09:36 PM, Frederic wrote:

> Hi, 
>  
> Is it normal that the following code runs into a cpu loop 
> indefinitively? 
> I would except to find 3 "a" ... 
>  
> NSString* str = @"a a a"; 
> NSScanner* scanner = [NSScanner scannerWithString:str]; 
> NSCharacterSet *set = [NSCharacterSet 
> characterSetWithCharactersInString:@"a"]; 
> while ([scanner isAtEnd] == NO) 
> { 
>       if ([scanner scanUpToCharactersFromSet:set intoString:nil]) 
>       { 
>               NSLog( @"found a" ); 
>       } 
> } 

Yes that's normal - you are repeatedly scanning up to the first 'a',
but never scanning the letter 'a' itsself.

You need a [scanner scanString @"a" intoString: 0] where your NSLog() is.