hdf5/hl/examples/ex_table_12.c

/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
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 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
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 * 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.     *
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#include "hdf5.h"
#include "hdf5_hl.h"
#include <stdlib.h>

/*-------------------------------------------------------------------------
 * Table API example
 *
 * H5TBdelete_field
 *
 *-------------------------------------------------------------------------
 */

#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 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}
 };

 /* 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;
 Particle   fill_data[1] =
 { {"no data",-1,-1, -99.0f, -99.0} };
 herr_t     status;
 hsize_t    nfields_out;
 hsize_t    nrecords_out;

 /* Initialize the 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_12.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, p_data  );

 /* Delete the field */
 status=H5TBdelete_field( file_id, TABLE_NAME, "Pressure" );

 /* 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;

}