On Wed, May 10, 2017 at 10:30 PM, Rob Gaddi
<rgaddi@highlandtechnology.invalid> wrote:
> Sorry, but I'm just too proud of this.
>
> Given that you have:
>
> class RegisterLayout(ctypes.Structure):
> ...yadayadayada...
>
> You can then:
>
> fh = os.open('/dev/devicethingy', os.O_RDWR)
> mm = mmap.mmap(fh, ctypes.sizeof(RegisterLayout))
> registers = RegisterLayout.from_buffer(mm)
>
> And it just works. Behaves exactly the same way memory-mapping that struct
> in C would. Sure the accesses take dict lookups, and that definitely slows
> you down a bit. If you REALLY really needed that speed you'd be writing C.
> But it works.
To clarify, the dict lookup here is to bind the CField data descriptor
from the class dict. It isn't using the instance dict.
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