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121 lines
3.4 KiB
C
121 lines
3.4 KiB
C
/*! \file
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Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
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2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014,
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2015, 2016, 2017, 2018
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University Corporation for Atmospheric Research/Unidata.
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See \ref copyright file for more info.
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*/
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/* This example program is part of Unidata's netCDF library for
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scientific data access.
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This program demonstrates various ways to create a netCDF file,
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open an existing file, and close a file.
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Ed Hartnett, 5/29/4
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$Id: file.c,v 1.1 2004/07/26 14:04:42 ed Exp $
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*/
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#include <netcdf.h>
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#include <stdio.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 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 e; \
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} while (0)
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#define FILENAME "test.nc"
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#define VARNAME "var1"
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#define DIMNAME "d1"
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#define NUMDIMS 1
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#define DIMLEN 10
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#define ERROR 2 /* exit code for example failure */
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int
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main()
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{
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/* These are netCDF IDs for file, dimension, and variable. */
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int ncid, dimid, varid;
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/* This array will hold one ID for each dimension in the
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variable, in this case, one. */
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int dimids[NUMDIMS];
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/* This is some one-dimensional phoney data to write and read. */
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int data_out[] = {0,1,2,3,4,5,6,7,8,9};
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int data_in[DIMLEN];
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int i, res;
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/* Create a classic format netCDF file, overwriting any file of
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this name that may already exist. */
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if ((res = nc_create(FILENAME, NC_CLOBBER, &ncid)))
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BAIL(res);
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/* Define a dimension. The functions will return a dimension ID to
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dimid. */
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if ((res = nc_def_dim(ncid, DIMNAME, DIMLEN, &dimid)))
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BAIL(res);
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/* Define a variable. First we must specify which dimensions this
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variable uses, by adding their dimension IDs to the dimids array
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that we pass into nc_def_var. In this example, there is just one
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dimension. */
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dimids[0] = dimid;
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if ((res = nc_def_var(ncid, VARNAME, NC_INT, NUMDIMS, dimids, &varid)))
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BAIL(res);
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/* The enddef function tells the library that we are done with
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defining metadata in the newly-created file, and now want to
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write some data. */
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if ((res = nc_enddef(ncid)))
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BAIL(res);
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/* Write our phoney integer data. Since we've already specified the
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shape of this variable, we only need to provide a pointer to the
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start of the data. */
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if ((res = nc_put_var_int(ncid, varid, data_out)))
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BAIL(res);
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/* Close the file. This flushes all buffers and frees any resources
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associated with the file. We are closing the file here so that
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we can demonstrate nc_open. Usually we wouldn't close the file
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until done with it. */
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if ((res = nc_close(ncid)))
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BAIL(res);
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/* Now open the file for read-only access. */
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if ((res = nc_open(FILENAME, NC_NOWRITE, &ncid)))
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BAIL(res);
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/* Find the varid that represents our data. */
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if ((res = nc_inq_varid(ncid, VARNAME, &varid)))
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BAIL(res);
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/* Read the data, all in one lump. */
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if ((res = nc_get_var_int(ncid, varid, data_in)))
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BAIL(res);
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/* Ensure we got the data we expected. */
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for (i=0; i<DIMLEN; i++)
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if (data_in[i] != data_out[i])
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{
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fprintf(stderr, "Unexpected value!\n");
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return ERROR;
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}
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/* Close the file again. */
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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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