Re: [netcdfgroup] Closing files opened only for reading (C interface -nc_close()?)

• To: "Paul Ganssle" <p.g.anssle@xxxxxxxxx>, <netcdfgroup@xxxxxxxxxxxxxxxx>
• Subject: Re: [netcdfgroup] Closing files opened only for reading (C interface -nc_close()?)
• From: "Shibaev, Sergei" <Sergei.Shibaev@xxxxxxxxxx>
• Date: Tue, 2 Aug 2011 08:30:13 +0100

Hi Paul,
 
It seems that LabView peculiarities interfere with those of NetCDF.
I have solved this problem by making a NetCDF interface DLL (in Visual
Studio without any LabView stuff) with all needed functions including
open/close; it works fine.
 
Regards,
Sergei Shibaev
 
-----Original Message-----
From: netcdfgroup-bounces@xxxxxxxxxxxxxxxx
[mailto:netcdfgroup-bounces@xxxxxxxxxxxxxxxx] On Behalf Of Paul Ganssle
Sent: 01 August 2011 21:50
To: netcdfgroup@xxxxxxxxxxxxxxxx
Subject: [netcdfgroup] Closing files opened only for reading (C
interface -nc_close()?)


Hi all, 
   I'm looking for some help with a netcdf-powered application, and it
seemed like this was the right mailing list to ask. Apologies in advance
if this is an inappropriate place to ask this question.


  The problem I'm having is with the file open/close model in netcdf 4
(4.1.3). I'm using LabWindows/CVI 9.0 to build a program and using
netCDF for all my data reading/writing needs. The problem is that in a
few cases it seems like I'm leaving these files open causing them to
lock, but given that you can't call nc_close() on a file that's been
opened for reading only (totally crashes my application if I do that -
no error is returned), I don't really understand how to unlock the
files. Right now I'm dealing with files where you build some set of
variables and metadata in a UI editor, then save them to file. If you
load them from file first, when you try to save them, it returns the
error "Could not add HDF5 metadata", but that only happens when the file
is locked due to being in use, because there's a call to
DeleteFilename(filename) that occurs before the nc_create call. 

   Given that it was only ever opened with nc_open(filename, NC_NOWRITE,
&ncid), I don't understand why it could possibly be locked. So my
overall question is, "how do I fix this?", but more specifically, I
guess I'm looking for a way to either force close netcdf files that were
opened by some unknown function or force close all open netcdf files.

           Best,
               Paul Ganssle


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