hex to bin 16 bit word

[Steven D'Aprano]

On Fri, 27 Apr 2012 11:56:45 -0700, Paul Rubin wrote:

> python <w.g.sneddon at gmail.com> writes:
>> What to decode hex '0xC0A8'  and return signed short int.
> 
> Is this right?
> 
>     n = int('0xC0A8', 16)
>     if n >= 0xffff:
>        n -= 0x10000


No.

>>> struct.unpack('>h',b'\xC0\xA8')
(-16216,)
>>> n = int('0xC0A8', 16)
>>> if n >= 0xffff:
...     n -= 0x10000
...
>>> n
49320


Should be -16216.

Personally, I don't see why the OP doesn't just use struct.unpack to 
unpack a struct.



-- 
Steven