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20050405: problem using UDUNITS with Fortran code


>Date: Wed, 6 Apr 2005 17:31:17 -0400 (EDT)
>From: Yuanchong Zhang <address@hidden>
>Organization: Columbia University/NASA GISS
>To: address@hidden (Steve Emmerson)
>Subject: Re: 20050405: problem using UDUNITS with Fortran code
> Keywords: 200504051922.j35JM9v2005883

The above message contained the following:

>       The option 3 doesn't work. I'm asking our system people to
> look at option 2.
>       Meanwhile, for option 1, besides those lines without C that I
> should declare in my Fortran program, I don't know how do deal with 
> #ifndef PTR
> #   define PTR        integer
> #endif

The Fortran function UTMAKE returns a C pointer to a new unit
data-structure.  This value must be stored in a Fortran data-type that
is the same size as a C pointer.  Typically, this is an INTEGER*4 -- but
it will be an INTEGER*8 on 64-bit systems.

If you're not going to use the PTR definition in the "udunits.inc" file,
then you will have to determine the Fortran data-type appropriate for
your system.  You should consistently use this data-type in your Fortran
code wherever the UDUNITS API expects the return value from UTMAKE.

For example:

    integer*4   speedUnit
    utdec('furlongs/fortnight', speedUnit);

>       Please give me specifics about it. I'm attaching the
> udunits.inc file so you can give me back all the lines I should
> declare. Thank you. 
> Yuanchong

Steve Emmerson