Btrieve/C-extension question

vincent wehren v.wehren at home.nl
Thu Jun 19 11:13:31 CEST 2003


Hi,

I need to write a Python extension that wraps several C functions to
access Pervasive/Btrieve files (of a specific format - for a specific
purpose - ODBC
access is not an option) on win32.

Btrieve keeps track of file positions using a so-called position block.
This is a 128-byte block of memory (e.g. UBYTE pos_blk[128]).

Single file access works like a charm, as the pos_blk is managed entirely on
the C-side.

Now I want to be able to work with multiple files, so I my guess is, (apart
from some other things) I need to
return the position block to the Python caller and pass it as argument to
any next function
call (first, next, prev, etc).

Is it sensible to pass such a block of memory to Python and back?
If so, what is the best way to go about this, I.O.W, how do I pass such a
block of memory
to Python and back (unchanged).

Any pointers would be much appreciated.

Regards,
Vincent Wehren






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