Objective-C parse hex string to integer

iphone objective-c string parsing hex
Richard J. Ross III picture Richard J. Ross III · Sep 6, 2010 · Viewed 55.3k times · Source

I would like to know how to parse a hex string, representing a number, in Objective-C. I am willing to use both an objective, or a C-based method, either is fine.

example:

#01FFFFAB

should parse into the integer: 33554347

Any help would be appreciated!

Answer

dreamlax picture dreamlax · Sep 6, 2010

Joshua Weinberg's answer is mostly correct, however the 0x prefix is optional when scanning hexadecimal integers. If you have a string in the format #01FFFFAB, you can still use NSScanner, but you can skip the first character.

unsigned result = 0;
NSScanner *scanner = [NSScanner scannerWithString:@"#01FFFFAB"];

[scanner setScanLocation:1]; // bypass '#' character
[scanner scanHexInt:&result];

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