Re: Segmentation fault with CDF routines under Linux

[Med Bennett <mbennett(at)indra.com>]

I've not used CDF, but the only thing I can think of is that perhaps your
variable 'file' is a string array of length 1 rather than just a string.
What does it say if you do a 'help,file' after
file=findfile('ac_*_swe_'+year_beg+month_beg+day_beg+'*.cdf')?  This has
tripped me up numerous times in other situations.  You should probably also
use a variable name other than 'file', as that is a keyword to the open
procedure.


riglerej@my-deja.com wrote:

> Using both 5.3, and 5.4, I consistently have problems with seg-faults
> when trying to run various CDF routines under Linux.  I'm fairly new to
> using IDL to read CDFs, but I'm not trying to do anything strange.  In
> fact, I can't even get cdf_open to work.
>
> Specifically, I have a problem when my argument to cdf_open is a string
> provided by the findfile routine.  If I type in my own string,
> everything works great, but if it comes from findfile, I get a
> seg-fault.  The exerpt below is copied exactly from my session, an
> should give a very clear idea of what is happening...
>
>   IDL Version 5.4 (linux x86). (c) 2000, Research Systems, Inc.
>   Installation number: 100.
>   Licensed for use by: moiraine
>
>   IDL> year_beg='2000'
>   IDL> month_beg='08'
>   IDL> day_beg='01'
>   IDL> help
>   % At  $MAIN$
>   DAY_BEG         STRING    = '01'
>   MONTH_BEG       STRING    = '08'
>   YEAR_BEG        STRING    = '2000'
>   Compiled Procedures:
>       $MAIN$
>
>   Compiled Functions:
>
>   IDL> file=findfile('ac_*_swe_'+year_beg+month_beg+day_beg+'*.cdf')
>   IDL> print,file
>   ac_k0_swe_20000801_v01.cdf
>   IDL> id=cdf_open(file)
>   % Loaded DLM: CDF.
>   Segmentation fault
>
>   [jrigler@moiraine] [15:55:03]
>   1016 <~/research/LPF/data/cdf/ace/swe/2000> idl
>   IDL Version 5.4 (linux x86). (c) 2000, Research Systems, Inc.
>   Installation number: 100.
>   Licensed for use by: moiraine
>
>   IDL> file='ac_k0_swe_20000801_v01.cdf'
>   IDL> id=cdf_open(file)
>   % Loaded DLM: CDF.
>   IDL>
>
> Can anyone else recreate this on Linux, or with versions other than 5.3
> and 5.4?  I tried this with several different cdf files, so I don't
> think it is a problem with the file format.  Any other ideas?
>
> -Josh
>
> P.S. While I'd love to move to HDF, that is not an option, so it might
> be wisest not to make that suggestion.
>
> Sent via Deja.com http://www.deja.com/
> Before you buy.