hdf5/hl/examples/ex_table_03.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */


#include "hdf5.h"
#include "hdf5_hl.h"
#include <stdlib.h>

/*-------------------------------------------------------------------------
 * Table API example
 *
 * H5TBwrite_records
 *
 *-------------------------------------------------------------------------
 */

#define NFIELDS  (hsize_t)       5
#define NRECORDS (hsize_t)       8
#define NRECORDS_WRITE (hsize_t) 2
#define TABLE_NAME               "table"

int main( void )
{
 typedef struct Particle
 {
  char   name[16];
  int    lati;
  int    longi;
  float  pressure;
  double temperature;
 } Particle;

 Particle  dst_buf[NRECORDS];

 /* Calculate the size and the offsets of our struct members in memory */
 size_t dst_size =  sizeof( Particle );
 size_t dst_offset[NFIELDS] = { HOFFSET( Particle, name ),
                                HOFFSET( Particle, lati ),
                                HOFFSET( Particle, longi ),
                                HOFFSET( Particle, pressure ),
                                HOFFSET( Particle, temperature )};

 Particle  p = {"zero",0,0, 0.0f, 0.0};
 size_t dst_sizes[NFIELDS] = { sizeof( p.name),
                               sizeof( p.lati),
                               sizeof( p.longi),
                               sizeof( p.pressure),
                               sizeof( p.temperature)};

 /* Define field information */
 const char *field_names[NFIELDS]  =
 { "Name","Latitude", "Longitude", "Pressure", "Temperature" };
 /* Fill value particle */
 Particle   fill_data[1] =
	{ {"no data",-1,-1, -99.0f, -99.0} };
 hid_t      field_type[NFIELDS];
 hid_t      string_type;
 hid_t      file_id;
 hsize_t    chunk_size = 10;
 hsize_t    start;      /* Record to start reading/writing */
 hsize_t    nrecords;   /* Number of records to read/write */
 herr_t     status;
 int        i;

 /* Define 2 new particles to write */
 Particle  particle_in[NRECORDS_WRITE] =
 { {"zero",0,0, 0.0f, 0.0},
 {"one",10,10, 1.0f, 10.0} };

 /* Initialize the field field_type */
 string_type = H5Tcopy( H5T_C_S1 );
 H5Tset_size( string_type, 16 );
 field_type[0] = string_type;
 field_type[1] = H5T_NATIVE_INT;
 field_type[2] = H5T_NATIVE_INT;
 field_type[3] = H5T_NATIVE_FLOAT;
 field_type[4] = H5T_NATIVE_DOUBLE;

/* Create a new file using default properties. */
 file_id = H5Fcreate( "ex_table_03.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );

 /* Make the table */
 status=H5TBmake_table( "Table Title",
  file_id,
  TABLE_NAME,
  NFIELDS,
  NRECORDS,
  dst_size,
  field_names,
  dst_offset,
  field_type,
  chunk_size,
  fill_data,
  0,           /* no compression */
  NULL );      /* no data written */


 /* Overwrite 2 records starting at record 0 */
 start    = 0;
 nrecords = NRECORDS_WRITE;
 status=H5TBwrite_records( file_id, TABLE_NAME, start, nrecords, dst_size, dst_offset,
  dst_sizes, particle_in);

 /* read the table */
 status=H5TBread_table( file_id, TABLE_NAME, dst_size, dst_offset, dst_sizes, dst_buf );

 /* print it by rows */
 for (i=0; i<NRECORDS; i++) {
  printf ("%-5s %-5d %-5d %-5f %-5f",
   dst_buf[i].name,
   dst_buf[i].lati,
   dst_buf[i].longi,
   dst_buf[i].pressure,
   dst_buf[i].temperature);
  printf ("\n");
 }

  /* close type */
 H5Tclose( string_type );

 /* close the file */
 H5Fclose( file_id );

 return 0;

}