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
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