| Re: Common block access in DLM [message #39437 is a reply to message #39431] |
Tue, 18 May 2004 13:44   |
Rick Towler
Messages: 821
Registered: August 1998
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Senior Member |
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"Haje Korth" wrote...
> thanks for the example, this is more than I expected. Regarding my
project,
> I ported a FORTRAN library for geophysical coordinate transformations and
> magnetic field calculation from FORTRAN to IDL usind a DLM, basically IDL
> <-> DLM <-> C <-> FORTRAN, taking Ronn's exercises a little further.
> Unfortunately I only have Ronn's first edition book, so I do not know if
he
> expanded on this in the second edition.
I can't say. I know that he updated the text to include the new keyword API
and added the C++ section. I'm sure he did more, those were just the two
most compelling updates for me.
> Anyway, everything works as
> expected, but having to supply year, day of year, hour minute second for
> every call is nerve wrecking, and blows up the call to so many parameters
> that the IDL code looks confusing. I will give the global variables a try.
That's a good place to start. Then if you need the ability to run multiple
instances you can go the C++ route. I could dig up an example if you like.
Also, have you checked out Stein Vidar Hagfors Haugan's dlmform? It might
be able to handle the tedium for you.
http://www.astro.uio.no/~steinhh/idl/additions.html
http://www.astro.uio.no/~steinhh/idl/dlmform.html
> How do setup such a global variable in
> C? Is this just regular C language, or is there some fancy handling
required
> with the IDL external API? (I am pretty much C newby, but once I now this,
I
> think I can handle the interfacing with FORTRAN.)
Plain old regular C. Simply define it before your first function and it
will be available globally. I too am fumbling thru the dark when it comes
to C/C++ but luckily there are enough people in the group that can help us
when we get stuck. :)
Good luck!
-Rick
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