Hi Josef,
> I'd like to access a Perl-variable (a scalar) from within an XS. I do
> accept that the scalar may not (yet) exists, so I'd cater for that:
>
> How do I do that:
> - find out if a scalar exists
> - access the contents of the scalar.
If you know the name of a scalar variable, you can get a pointer to its
SV by using the following:
SV* perl_get_sv("package::varname", FALSE);
This returns NULL if the variable does not exist.
If you want to know if this variable (or any other SV) is actually
defined, you can call:
SvOK(SV*)
http://www.sdsc.edu/~moreland/courses/IntroPerl/docs/manual/pod/perlguts.html
Hope this helps.
Cheers,
Olli
