[Octave-bug-tracker] [bug #39532] hgload/hgsave functions missing

[Pantxo Diribarne]

Follow-up Comment #6, bug #39532 (project octave):

Sorry my mistake, I said the way you use load doesn't work ... if you don't
use '-struct'.

I think it would be better to not use '-struct' and use the name of the struct
returned by load as a pointer for the origin of the file. 
Let me explain: matlab figs consist of a struct with the following name
"hgS_070000" or "hgS_080000" (for matlab 7 or 8) saved as a .fig with matlab's
binary data format. 

It would be interesting for octave to use the same strategy:
* we could then keep track of the version of octave that created the struct.
As hdl2struct may evolve and break backward compatibility, this will be
helpful
* we could also detect if the struct was written by matlab in which case we
shouldn't try to load it until struct2hdl is able to handle matlab structs.

It would then give you something like:


##(hgsave) 
s_oct40 = hdl2struct (handle);
save ("-binary", fname, "s_oct40")

##(hgload)
try
  load (fname, "s_oct40")
catch
  error ("hgload: support only files created by hgsave from octave version 4.0
and latter")
end_try_catch




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