hdf5/hl/examples/ex_table_06.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
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 * 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          *
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#include "hdf5.h"
#include "hdf5_hl.h"
#include <stdlib.h>

/*-------------------------------------------------------------------------
 * Table API example
 *
 * H5TBget_table_info
 *
 *-------------------------------------------------------------------------
 */

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

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

 /* 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 )};

  /* 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;
  Particle   fill_data[1] =
  { {"no data",-1,-1, -99.0f, -99.0} };   /* Fill value particle */
  int        compress  = 0;
  hsize_t    nfields_out;
  hsize_t    nrecords_out;
  herr_t     status;

  /* Initialize 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_06.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );

 /* Make a table */
 status=H5TBmake_table( "Table Title",file_id,TABLE_NAME,NFIELDS,NRECORDS,dst_size,
                       field_names, dst_offset, field_type,
                       chunk_size, fill_data, compress, NULL);

 /* Get table info  */
 status=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);

  /* close type */
 H5Tclose( string_type );

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

 return 0;


}