hdf5/hl/examples/ex_table_09.c

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

/*-------------------------------------------------------------------------
 * Table API example
 *
 * H5TBadd_records_from
 *
 *-------------------------------------------------------------------------
 */

#define NFIELDS      (hsize_t)  5
#define NRECORDS     (hsize_t)  8
#define NRECORDS_INS (hsize_t)  2
#define TABLE1_NAME             "table1"
#define TABLE2_NAME             "table2"

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

 Particle  dst_buf[ NRECORDS + NRECORDS_INS ];

 /* 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( dst_buf[0].name),
                               sizeof( dst_buf[0].lati),
                               sizeof( dst_buf[0].longi),
                               sizeof( dst_buf[0].pressure),
                               sizeof( dst_buf[0].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} };   /* Fill value particle */ 
 hsize_t    start1;                      /* Record to start reading from 1st table */
 hsize_t    nrecords;                    /* Number of records to insert */
 hsize_t    start2;                      /* Record to start writing in 2nd table */
 herr_t     status;
 int        i;
 hsize_t    nfields_out;
 hsize_t    nrecords_out;
 
 /* 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_09.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );
  
 /* Make 2 tables: TABLE2_NAME is empty  */
 status=H5TBmake_table( "Table Title",file_id,TABLE1_NAME,NFIELDS,NRECORDS, 
                         dst_size,field_names, dst_offset, field_type, 
                         chunk_size, fill_data, compress, p_data  );
 
 status=H5TBmake_table( "Table Title",file_id,TABLE2_NAME,NFIELDS,NRECORDS, 
                         dst_size,field_names, dst_offset, field_type, 
                         chunk_size, fill_data, compress, NULL  );
 
 
 /* Add 2 records from TABLE1_NAME to TABLE2_NAME  */
 start1    = 3;      
 nrecords  = NRECORDS_INS; 
 start2    = 6;      
 status=H5TBadd_records_from( file_id, TABLE1_NAME, start1, nrecords, TABLE2_NAME, start2 );

 /* read TABLE2_NAME: it should have 2 more records now */
 status=H5TBread_table( file_id, TABLE2_NAME, dst_size, dst_offset, dst_sizes, dst_buf );

 /* Get table info  */
 status=H5TBget_table_info (file_id,TABLE2_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 the file. */
 H5Fclose( file_id );
 
 return 0;
}