CODEWITHSUNDEEP
iphoneobjective-cios
baladurasa
baladurasa

Reputation: 75

Getting a strange error for substringWithRange

I have a strange issue with substringWithRange function.

I have an NSString with a length of 22.

When I do this:

NSString *result = [myString substringWithRange:NSMakeRange(3, 21)];

Everything is fine. But when I try to get something from middle, like:

NSString *result = [myString substringWithRange:NSMakeRange(11, 14)];

It gives an out of bounds exception.

'NSRangeException', reason: '* -[NSCFString substringWithRange:]: Range or index out of bounds'

So, what's wrong?

Upvotes: 1

Views: 7651

Answers (2)

Julia Mironova
Julia Mironova

Reputation: 171

NSRange return start position and length. Why length instead end position? Because for example in string Night Café code [str rangeOfString:@"Café"] will return length 5, because Café is in memory will be look like Cafe´ (5 bytes in memory for 4 letter word).

Upvotes: 0

Matthias Bauch
Matthias Bauch

Reputation: 90117

A NSRange is not "from index to index". It is "from index with length".

Why the first one works? I have no idea. I guess in reality your string is not 22 characters long but 24.

Upvotes: 12

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