[Python-Dev] buffer interface for C extensions (original) (raw)

Dan Lenski dlenski at gmail.com
Thu May 22 23:25:09 CEST 2008

On Thu, 22 May 2008 23:10:09 +0200, M.-A. Lemburg wrote:

On 2008-05-19 00:59, Dan Lenski wrote: You should probably ask such questions on the capi-sig list.

To answer your question: t# requires support for the read-only 8-bit character buffer interface s# can use the read buffer interface w# requires support for the write buffer interface

I somehow overlooked the fact that the "s#" argument specifier supports exactly the functionality that I need. D'oh!

Those are two different buffer interface slots, so whether a particular object works with t# or w# depends on whether it implements the slots in question.

You should probably try s#, as this will also work with objects that implement the getreadbuffer slot.

Worked like a charm!

The details can be found in Python/getargs.c

I'm still unclear on the difference between the character/read buffer interfaces, but I'll read the code and try and figure that out. Thanks for your help, Marc-Andre!!!

Dan

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