Search code examples
objective-cintnsdata

Objective C converting NSData with hex value to int

I have a NSData with a hex value inside e.g. <EC>.

Now I need to convert this value into an int variable to get int x = -20.

Ideas?

Solution

  • You can use getBytes to extract that byte from the NSData:

    uint8_t byte;
[data getBytes:&byte length:1];

    If you really need that in an int, then grab it from that uint8_t variable:

    int x = byte;

    As an aside, if you really need this 0xec value interpreted as -20 rather than 236, you can use int8_t instead of uint8_t, and the sign of this byte value will be preserved. Frequently, though, when dealing with binary data, we deal with unsigned bytes, rather than signed integers, but it just depends upon what this binary NSData represents.