iphone - How do I get the 1st and 2nd byte in a NSData object?
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I have a NSData object which is supposed to work like a byte array.

I need to get the `1st and 2nd bytes in the NSData`, but don't know how.

If I have a byte array in Java, I can easily get those via `barray[0] and barray[1]`, but how do I do it for NSData?

Thanks