Parsing 64-bit unsigned integer on iOS

Question

I have very big unsigned integral number in NSString. This may be big to 2^64. Is there an existing functions/classes parsing this?

As I know, it's unsigned long long value, but, It's hard to know what kind of method should I use to parse this.

what exactly you mean by parsing? the conversion from your NSString number to unsigned long long? — nacho4d, Oct 21 '10 at 06:23
To request support for reading unsigned values from NSString, please visit http://bugreport.apple.com and file a dupe of radar://2264733 against component `Foundation | X`. — Quinn Taylor, Jan 23 '13 at 05:47

score 9 · Accepted Answer · answered Oct 21 '10 at 06:32

9

Perhaps not the prettiest answer, but you should be able to do something like this:

#include <stdlib.h>
...
unsigned long long parsedValue = strtoull([yourString UTF8String], NULL, 0);

Someone else might have a more cocoa-ey way of doing it.

answered Oct 21 '10 at 06:32

Stephen Canon

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Oh, this is nice. I like C functions. Thanks for answer! – eonil Oct 23 '10 at 07:27
1

Just [yourString longLongValue]; – Roman Truba Jul 28 '12 at 15:42
@roman truba: that works for signed values up to 2^63; the questioner wanted *unsigned* values up to 2^64. – Stephen Canon Jul 28 '12 at 16:37

score 1 · Answer 2 · answered Feb 24 '13 at 15:38

This is an old one but here's a slightly more Cocoa-ey variant of Stephen Canon's (correct) answer:

#import <stdlib.h>

@implementation NSString (MyHelpers)
    - (unsigned long long)unsignedLongLongValue {
        return strtoull([self UTF8String], NULL, 0);
    }
@end

Now all strings will respond to the unsignedLongLongValue selector.

score 0 · Answer 3 · answered Oct 21 '10 at 16:23

0

This might work, though it only gets to 2^63 - 1:

NSScanner *scanner = [NSScanner scannerWithString:numericString];
long long valueFromString;
if(![scanner scanLongLong:&valueFromString]) {
    //ERROR
}

There doesn't appear to be a scanUnsignedLongLong method for NSScanner.

answered Oct 21 '10 at 16:23

Jay Peyer

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Thanks for answer, but that's just the trouble what I'd explained. The problem is just the value can be up to 2^64. – eonil Oct 23 '10 at 07:25

Parsing 64-bit unsigned integer on iOS

3 Answers3