SV: PyArg_ParseTuple() & Py_DECREF()

[Fredrik Lundh]

(hey, what's this obsession with "charset=koi8-r"?)

Alex Farber <farber at cpan.org> wrote:
> > no.  PyArg_ParseTuple returns borrowed references.
>
> Do you have to call free(str) after
> PyArg_ParseTuple (val, "sO", &str, &obj)?

the fine manual has the answer:

    "s" (string) [char *]

    Convert a Python string to a C pointer to a
    character string. You must not provide storage
    for the string itself; a pointer to an existing
    string is stored into the character pointer
    variable whose address you pass.

    The C string is null-terminated. The Python
    string must not contain embedded null bytes;
    if it does, a TypeError exception is raised.

    "s#" (string) [char *, int]

    This variant on "s" stores into two C variables,
    the first one a pointer to a character string,
    the second one its length. In this case the
    Python string may contain embedded null bytes.

> Where is str stored?

that's up to you...

> Will it be overwritten after calling PyArg_ParseTuple
> (val, "sO", &str2, &obj)?

no.  see above.

</F>

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