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Re: 20041119: NetCDF Java library

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  • Subject: Re: 20041119: NetCDF Java library
  • Date: Fri, 19 Nov 2004 16:15:57 -0700
Unidata Support wrote:


------- Forwarded Message


To: <address@hidden>
From: "Ali Beyad" <address@hidden>
Subject: NetCDF Java library
Organization: UCAR/Unidata
Keywords: 200411191440.iAJEeA7j012228


Hi,

I was just recently made aware of the new alpha version of NetCDF Java library 
2.2.  In our application, we are trying to use a Java library that can parse 
HDF5 files.  I have been using HDF5 library from UIUC, which is in native C 
with a JNI wrap around, and the major problem there is that we can not read 
variable-length datatypes (e.g. if a String is a variable-length datatype, the 
library currently cant handle it and we get garbled strings).

I was wondering if NetCDF Java v 2.2 (or even v 2.1) can handle the parsing of 
variable length datatypes (we have both datasets and attributes of datasets 
that are variable-length datatypes)?  If so, is there anywhere in the 
documentation that you can point me to as a reference for how to accomplish 
this?

Thank you very much for your help.  Looking forward to your response.
-Ali 



Hi Ali:
nj22 should work. HDF5 Strings get mapped to netcdf Strings. Other types get mapped to 1-d arrays of unknown length. When you do the read, you will get back all of the data, you can look at it to see how long it is.
please send me a file or a URL to a file that has the variable length datatypes, so i can double check. 

thanks.