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79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/* This example program is part of Unidata's netCDF library for
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scientific data access.
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This program will create a large file in netCDF classic
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format. From the netcdf docs:
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"If you don't use the unlimited dimension, only one variable can
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exceed 2 Gbytes in size, but it can be as large as the underlying
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file system permits. It must be the last variable in the dataset,
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and the offset to the beginning of this variable must be less than
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about 2 Gbytes."
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Ed Hartnett, 8/11/4
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$Id: quick_small_files.c,v 1.2 2004/09/10 14:27:34 ed Exp $
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*/
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#include <netcdf.h>
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#include <stdio.h>
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#include <string.h>
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/* This macro handles errors by outputting a message to stdout and
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then exiting. */
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#define NC_EXAMPLE_ERROR 2 /* This is the exit code for failure. */
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#define BAIL(e) do { \
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printf("Bailing out in file %s, line %d, error:%s.\n", \
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__FILE__, __LINE__, nc_strerror(e)); \
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return NC_EXAMPLE_ERROR; \
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} while (0)
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#define NUMDIMS 1
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#define NUMVARS 2
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/* This dim len is the max size the first of two fixed size variables
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for an 8-byte type in classic format: int((2*31 - 4) / 8), that is,
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2 GB minus a bit, on an 8 byte boundary. */
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#define DIM_LEN 268435455
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int
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main()
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{
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int ncid, spockid, kirkid, dimids[NUMDIMS];
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double val_in, val_out = 999.99;
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size_t index[NUMDIMS] = {1};
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int i, res;
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/* Create the netCDF classic format file. */
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if ((res = nc_create("example.nc", NC_CLOBBER, &ncid)))
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BAIL(res);
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/* Turn off fill mode to speed things up. */
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if ((res = nc_set_fill(ncid, NC_NOFILL, NULL)))
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BAIL(res);
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/* Define dimension. */
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if ((res = nc_def_dim(ncid, "longdim", DIM_LEN, dimids)))
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BAIL(res);
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/* Define two variables. */
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if ((res = nc_def_var(ncid, "spock", NC_DOUBLE, NUMDIMS,
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dimids, &spockid)))
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BAIL(res);
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if ((res = nc_def_var(ncid, "kirk", NC_DOUBLE, NUMDIMS,
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dimids, &kirkid)))
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BAIL(res);
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/* We're finished defining metadata. */
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if ((res = nc_enddef(ncid)))
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BAIL(res);
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if ((res = nc_put_var1_double(ncid, spockid, index, &val_out)))
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BAIL(res);
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/* We're done! */
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if ((res = nc_close(ncid)))
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BAIL(res);
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return 0;
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}
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