Py_ParseTuple Problem

[Terry Reedy]

<youngdubliner at hotmail.com> wrote in message
news:4039221c.0404202256.3f21d817 at posting.google.com...
> Hi All ,
>
> Bit of a problem with Py_Parse or Py_ParseTuple ?
>
> I have a python script that reads a sector of flash in an embedded
device.
> it returns the value of each byte within the sector as a tuple.
>
> i.e. [255,255,255,255,255,255,255, .......etc etc for the whole sector !

As written, above is a list instead of a tuple.

> We are using this script to read whats currently in any sector.
> No problems there.
>
> Now I need to call our script from C.
>
> I want to copy each of the bytes within the sector into an C unsigned
char *array

Without knowing the C API, I would try to generate byte string from within
Python.  Three possibilities:

1. turn list into string - secstring = ''.join(map(chr, seclist)).  Then
use C API to get the cstring from string object.

2. turn list/tuple into array (of unsigned chars) or built that directly
instead of list or tuple.  See array module.  I presume you can get at the
buffer itself from C API.

3. look into ctypes module.

> Is there any way to do this using Py_ParseTuple or Py_Parse ???

If you mean PyArg.... stuff, I believe these are meant for parsing
argu;ments passed as heterogeneous Python tuple, which is quite different
from what you want to do.

Terry J. Reedy