hdf5/hl/examples/ex_table_08.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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

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

/*-------------------------------------------------------------------------
 * Table API example
 *
 * H5TBinsert_record
 *
 *-------------------------------------------------------------------------
 */

#define NFIELDS      (hsize_t)  5
#define NRECORDS     (hsize_t)  8
#define NRECORDS_INS (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 + NRECORDS_INS ];

  /* Define an array of Particles */
 Particle  p_data[NRECORDS] = {
 {"zero",0,0, 0.0f, 0.0},
 {"one",10,10, 1.0f, 10.0},
 {"two",  20,20, 2.0f, 20.0},
 {"three",30,30, 3.0f, 30.0},
 {"four", 40,40, 4.0f, 40.0},
 {"five", 50,50, 5.0f, 50.0},
 {"six",  60,60, 6.0f, 60.0},
 {"seven",70,70, 7.0f, 70.0}
  };

 /* 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 )};
 size_t dst_sizes[NFIELDS] = { sizeof( p_data[0].name),
                               sizeof( p_data[0].lati),
                               sizeof( p_data[0].longi),
                               sizeof( p_data[0].pressure),
                               sizeof( p_data[0].temperature)};

 /* Define an array of Particles to insert */
 Particle  p_data_insert[NRECORDS_INS] =
 { {"new",30,30, 3.0f, 30.0},
 {"new",40,40, 4.0f, 40.0}
 };

 /* Define field information */
 const char *field_names[NFIELDS]  =
 { "Name","Latitude", "Longitude", "Pressure", "Temperature" };
 hid_t      field_type[NFIELDS];
 hid_t      string_type;
 hid_t      file_id;
 hsize_t    chunk_size = 10;
 int        compress  = 0;
 int        *fill_data = NULL;
 hsize_t    start;      /* Record to start reading */
 hsize_t    nrecords;   /* Number of records to insert/delete */
 hsize_t    nfields_out;
 hsize_t    nrecords_out;
 int        i;

 /* 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_08.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );

 /* Make the table */
 H5TBmake_table( "Table Title",file_id,TABLE_NAME,NFIELDS,NRECORDS,
                         dst_size,field_names, dst_offset, field_type,
                         chunk_size, fill_data, compress, p_data  );

 /* Insert records */
 start    = 3;
 nrecords = NRECORDS_INS;
 H5TBinsert_record( file_id, TABLE_NAME, start, nrecords, dst_size, dst_offset,
  dst_sizes, p_data_insert );

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

 /* get table info  */
 H5TBget_table_info(file_id,TABLE_NAME, &nfields_out, &nrecords_out );

 /* print */
 printf ("Table has %d fields and %d records\n",(int)nfields_out,(int)nrecords_out);

 /* print it by rows */
 for (i=0; i<nrecords_out; 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;

}