| Re: making an object from class structure? [message #23295] |
Wed, 17 January 2001 14:54 |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Senior Member |
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David Fanning wrote:
>
> For the simple reason that the SETPROPERTY method doesn't
> (in my experience, *ever*) allow you to set all the fields
> of the object.
If we already are so far as filling in the fields manually, we might as
well write code for it (call it HackProperty instead of SetProperty),
since even manual assignment requires typing. At least on my computer -
I can't yet talk to it (well, I do talk to it but it does not know all
the words that I use, and I hope it does not literally respond to some
of them).
Cheers,
Pavel
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| Re: making an object from class structure? [message #23297 is a reply to message #23295] |
Wed, 17 January 2001 14:47  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Pavel A. Romashkin (pavel.romashkin@noaa.gov) writes:
> I guess I am still a little confused.
Pavel, he is making his *own* save files. :-)
> If you are going to manually fill in values into future object's fields,
> why not get its definition from SAV and then use OBJ_NEW and SETPROPERTY
> to make a reference and fill it with data?
For the simple reason that the SETPROPERTY method doesn't
(in my experience, *ever*) allow you to set all the fields
of the object.
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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| Re: making an object from class structure? [message #23302 is a reply to message #23300] |
Wed, 17 January 2001 12:05 |
Pavel A. Romashkin
Messages: 531
Registered: November 2000
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Senior Member |
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Craig Markwardt wrote:
>
> Hi object experts!
>
> I am a little stymied on an "internal" object question. In the course
> of restoring objects from a SAVE file, I can definitely restore the
> class *structure*. That is, I can read the structure definition, the
> super classes, etc and reconstruct a class structure filled with the
> correct data.
>
> My question is, how do I get an object "pointer" to it.
Hi Craig,
Isn't it the object *reference* that you get when you restore a saved
object? I could never get to object *structure* definition (which I use
for my lazy-sitting-place loop cleanup method) by using anything other
means than o_str = {My_obj}. Or are you looking for a way to get a
*definition* from SAV, then re-fill it manually and assign it to an
object reference?
Cheers,
Pavel
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| Re: making an object from class structure? [message #23315 is a reply to message #23302] |
Wed, 17 January 2001 07:32 |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Craig Markwardt (craigmnet@cow.physics.wisc.edu) writes:
> Hi object experts!
>
> I am a little stymied on an "internal" object question. In the course
> of restoring objects from a SAVE file, I can definitely restore the
> class *structure*. That is, I can read the structure definition, the
> super classes, etc and reconstruct a class structure filled with the
> correct data.
>
> My question is, how do I get an object "pointer" to it. To be clear,
> the is the difference between S and O in the following code:
>
> s = {objtype, name:'a', value: 27}
> o = obj_new('objtype')
>
> IDL> help, s, o
> S STRUCT = -> OBJTYPE Array[1]
> O OBJREF = <ObjHeapVar3(OBJTYPE)>
>
> I have a structure like S, and want to make it into an object pointer
> like O, preserving the data inside S.
>
> Any ideas, or is this impossible?
Definitely impossible. :-)
I mean, maybe it's theoretically possible, given either INIT
or SETPROPERTY methods that configure *every* internal
field in the object structure. But I've never, ever written
an object that allows that, and I can't imagine the RSI-supplied
objects do it either.
Cheers,
David
P.S. Let's just say I'm not exactly renowned for my
programming imagination, so maybe there is still hope
from another source. :-)
--
David Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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