Diez B. Roggisch wrote: > Larry Bates wrote: > >> eliss wrote: >>> I'm using dl.call() to call a C function in an external library. It's >>> working great so far except for one function, which returns an >>> unsigned int in the C version. However, in python it returns a signed >>> value to me. How can I get the unsigned value from this? I haven't >>> brushed up on my two's complement in a while, so I was hoping someone >>> could give me a hand. >>> >>> Thanks >>> >>> eliss >> It is returning 32 bits. If the sign bit (bit 32) is on it appears as a >> negative number. Test for negative and multiply the absolute value * 2. >> That should get you the unsigned value you want in a long. > > Erm... Nope. > > All bits set is -1 - so according to your recipe, that would be abs(-1) * 2 > = 2 > > I'd suggest this formula: > > if value < 0: > value = 2^32 + value + 1 > > Diez
Thanks for the correction. You are of course correct. -Larry -- http://mail.python.org/mailman/listinfo/python-list
