Hi,
this seems not the best list for this sort of questions, it's a list about
Embperl.....
Anyway a short answer:
Yes, you have to set the magic on all elements of hash/array. There is no
simple way to do it (at least not in 5.6.1) to get your C code called
directly.
There is some way to have a Perl callback (that's for tied hashs/arrays in
Perl), when any access to the array/hash is made. This Perl callback could
in turn call your C code, but there is no direct way.
The best way to understand what Perl is doing, is to go to the Perl source
and read sv.c,av.c and hv.c.
Gerald
----- Original Message -----
From: "Cory C. Albrecht" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Saturday, May 11, 2002 8:24 PM
Subject: magic for variables to link with the C vars where perl is embedded
into
> Hello All,
>
> I'm writing an app which uses perl as it's scripting langauge and I've
> just gotten around to using magic to link the C variables for my app's
> preferences to variables in the embedded perl so scripts can change the
> preferences. Magic for SVs turned out to be simpler than I expected,
> but magic for HVs ans AVs looks like it's going to be much more
> complicated.
>
> For arrays and hashes, am I going to have to manually set magic for
> each individual SV element? And for arrays of arrays or arrays of
> hashes, too?
>
> I don't quite understand what the hv_magic() function is supposed to
> do. In perlguts "Assigning Magic" it just says "This simply calls
> sv_magic and coerces the gv argument into an SV." But hv_magic()
> doesn't have the last 2 parameters that sv_magic() does. Can I do
> something like this:
>
> av = get_av("my_array", TRUE);
> sv_magic((SV *)av, NULL, 'U', (char *)data, sizeof(data));
> mg = mg_find((SV *)av, 'U');
> mg->mg_virtual = (MGVTBL *)calloc(1, sizeof(MGVTBL));
> mg->mg_virtual->svt_get = GetLinkedVar;
> mg->mg_virtual->svt_get = SetLinkedVar;
>
> and if yes, then in GetLinkedVar() and SetLinkedVar() how do I tell
> what element of the array I am accessing? It would be nice if there
> was a function av_magic() that had all the parameters of sv_magic(),
> but when mg_virtual->svt_get was called for this AV, in addition to
> the SV * and MAGIC * paramters there would be a third one indicating
> the actual array element that SV * is. Doing that coudl remove the
> necessity for have to set magic on each inidvidual SV in an array.
>
> I'd really appreciate it if anybody could point me to any examples of
> using magic to link perl arrays/hashes to C/C++ variables, or fuller
> documentation/examples than exist in perlguts.
>
> Thanks in advance.
> --
> Cory C. Albrecht
> Access denied - nah nah na nah nah!
>
>
>
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