Convert 1 byte to int Objective-C

Question

I have an NSData packet with data in it. I need to convert the byte at range 8, 1 to an int. To get the data at that location I do the following.

NSData *byte = [packet subdataWithRange:NSMakeRange(8, 1)];

If I NSLog byte

<01>

How do I think convert this to an int? This is probably the most basic of questions but I am just not getting it right.

Any help would be appreciated.

Update

With that data the int should be equal to 1. I am not sure if this has anything todo with Endian.

look at this http://stackoverflow.com/questions/2718712/how-to-convert-byte-value-into-int-in-objective-c — Dinesh, Nov 11 '13 at 09:28
Can you make it clear what actually you want to represent as integer for <01> it is 01 or just 1 ? — Dinesh, Nov 11 '13 at 09:37

Bryan Chen · Accepted Answer · 2013-11-11T09:36:30.133

5

use -[NSData bytes] to get raw buffer and read from it

int i = *((char *)[byte bytes])

or use -[NSData getBytes:length:]

char buff;
[bytes getBytes:&buff length:1];
int i = buff;

make sure you are reading from char * not int *, otherwise you are accessing invalid memory location, which may or may not crash or provide correct result.

edited Nov 11 '13 at 09:36

answered Nov 11 '13 at 09:29

Bryan Chen

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Yeah, have tried this. Still not working, updated the question. – sbarow Nov 11 '13 at 09:34
"not working"?? what is your expected result and actual result? – Bryan Chen Nov 11 '13 at 09:34
Expected result is 1 actual result is 31211265 – sbarow Nov 11 '13 at 09:35

Convert 1 byte to int Objective-C

1 Answers1