mirror of
https://github.com/Unidata/netcdf-c.git
synced 2024-12-27 08:49:16 +08:00
85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
/* Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
|
|
2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012,
|
|
2013, 2014, 2015, 2016, 2017, 2018 University Corporation for
|
|
Atmospheric Research/Unidata. See \ref copyright file for more
|
|
info. */
|
|
/**
|
|
* @file
|
|
* This example program is part of Unidata's netCDF library for
|
|
* scientific data access.
|
|
*
|
|
* This program will create a large file in netCDF classic
|
|
* format. From the netcdf docs:
|
|
*
|
|
* "If you don't use the unlimited dimension, only one variable can
|
|
* exceed 2 Gbytes in size, but it can be as large as the underlying
|
|
* file system permits. It must be the last variable in the dataset,
|
|
* and the offset to the beginning of this variable must be less than
|
|
* about 2 Gbytes."
|
|
*
|
|
* @author Ed Hartnett
|
|
*/
|
|
|
|
#include <netcdf.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
/* This macro handles errors by outputting a message to stdout and
|
|
then exiting. */
|
|
#define NC_EXAMPLE_ERROR 2 /* This is the exit code for failure. */
|
|
#define BAIL(e) do { \
|
|
printf("Bailing out in file %s, line %d, error:%s.\n", \
|
|
__FILE__, __LINE__, nc_strerror(e)); \
|
|
return NC_EXAMPLE_ERROR; \
|
|
} while (0)
|
|
|
|
#define NUMDIMS 1
|
|
#define NUMVARS 2
|
|
/* This dim len is the max size the first of two fixed size variables
|
|
for an 8-byte type in classic format: int((2*31 - 4) / 8), that is,
|
|
2 GB minus a bit, on an 8 byte boundary. That number is
|
|
268435455. But this is the longest dim len which works. */
|
|
#define DIM_LEN 268435440
|
|
|
|
int
|
|
main()
|
|
{
|
|
int ncid, spockid, kirkid, dimids[NUMDIMS];
|
|
double val_out = 999.99;
|
|
size_t index[NUMDIMS] = {1};
|
|
int res;
|
|
|
|
/* Create the netCDF classic format file. */
|
|
if ((res = nc_create("example.nc", NC_CLOBBER, &ncid)))
|
|
BAIL(res);
|
|
|
|
/* Turn off fill mode to speed things up. */
|
|
if ((res = nc_set_fill(ncid, NC_NOFILL, NULL)))
|
|
BAIL(res);
|
|
|
|
/* Define dimension. */
|
|
if ((res = nc_def_dim(ncid, "longdim", DIM_LEN, dimids)))
|
|
BAIL(res);
|
|
|
|
/* Define two variables. */
|
|
if ((res = nc_def_var(ncid, "spock", NC_DOUBLE, NUMDIMS,
|
|
dimids, &spockid)))
|
|
BAIL(res);
|
|
if ((res = nc_def_var(ncid, "kirk", NC_DOUBLE, NUMDIMS,
|
|
dimids, &kirkid)))
|
|
BAIL(res);
|
|
|
|
/* We're finished defining metadata. */
|
|
if ((res = nc_enddef(ncid)))
|
|
BAIL(res);
|
|
|
|
if ((res = nc_put_var1_double(ncid, spockid, index, &val_out)))
|
|
BAIL(res);
|
|
|
|
/* We're done! */
|
|
if ((res = nc_close(ncid)))
|
|
BAIL(res);
|
|
|
|
return 0;
|
|
}
|