Convert contents of NSString to bytes they represent

Question

Possible Duplicate:
NSString (hex) to bytes

I'm currently stuck trying to convert the contents of a NSString to a byte.

My program receives a string, for example CC to a byte 0xCC

I understand that you can convert an NSString to its hex representation, but this isn't what I need, as that uses the string encoding -- my CC would turn out as 0x63.

From what I understand, I need to cast the NSString (or char) to a raw byte, so that I can then later on convert it to a decimal but i'm getting really confused on how to do it.

So you receive a string which contains just hex characters (i.e. 0-9 A-F) and want to convert it to byte(s)? So `"CC"` => `0xCC` and `"ABCD"` => `0xAB 0xCD`? — mattjgalloway, Nov 28 '11 at 21:55

score 0 · Answer 1 · edited Nov 29 '11 at 00:50

0

Not 100% sure if this is what you mean but

NSData *bytes = [@"hello" dataUsingEncoding:NSUTF8StringEncoding];

would create a byte array.

edited Nov 29 '11 at 00:50

Macmade

52,708
13
106
123

answered Nov 28 '11 at 21:54

Michael Smith

498
2
5
15

Its ok, found the answer here: http://stackoverflow.com/questions/1874910/convert-hex-string-to-long – liamnichols Nov 28 '11 at 22:00
No, that just converts the characters to data in that encoding. That doesn't decode hexadecimal. – Peter Hosey Nov 29 '11 at 07:50
I know now. The question was too incoherent for me to completely understand what he was asking. – Michael Smith Nov 29 '11 at 08:48

Convert contents of NSString to bytes they represent

1 Answers1