mirror of https://gitee.com/openkylin/hdf5.git
166 lines
5.1 KiB
C
166 lines
5.1 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF5. The full HDF5 copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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#include "hdf5.h"
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#include "hdf5_hl.h"
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#include <stdlib.h>
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/*-------------------------------------------------------------------------
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* Table API example
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*
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* H5TBwrite_fields_index
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*
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*-------------------------------------------------------------------------
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*/
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#define NFIELDS (hsize_t) 5
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#define NRECORDS (hsize_t) 8
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#define NRECORDS_ADD (hsize_t) 3
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#define TABLE_NAME "table"
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int main( void )
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{
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typedef struct Particle
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{
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char name[16];
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int lati;
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int longi;
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float pressure;
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double temperature;
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} Particle;
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/* Define a subset of Particle, with latitude and longitude fields */
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typedef struct Position
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{
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int lati;
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int longi;
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} Position;
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/* Calculate the type_size and the offsets of our struct members */
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Particle dst_buf[NRECORDS];
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size_t dst_size = sizeof( Particle );
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size_t dst_offset[NFIELDS] = { HOFFSET( Particle, name ),
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HOFFSET( Particle, lati ),
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HOFFSET( Particle, longi ),
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HOFFSET( Particle, pressure ),
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HOFFSET( Particle, temperature )};
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size_t dst_sizes[NFIELDS] = { sizeof( dst_buf[0].name),
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sizeof( dst_buf[0].lati),
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sizeof( dst_buf[0].longi),
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sizeof( dst_buf[0].pressure),
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sizeof( dst_buf[0].temperature)};
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size_t field_offset_pos[2] = { HOFFSET( Position, lati ),
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HOFFSET( Position, longi )};
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/* Initially no data */
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Particle *p_data = NULL;
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/* Define field information */
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const char *field_names[NFIELDS] =
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{ "Name","Latitude", "Longitude", "Pressure", "Temperature" };
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hid_t field_type[NFIELDS];
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hid_t string_type;
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hid_t file_id;
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hsize_t chunk_size = 10;
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Particle fill_data[1] =
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{ {"no data",-1,-1, -99.0f, -99.0} }; /* Fill value particle */
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int compress = 0;
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hsize_t nfields;
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hsize_t start; /* Record to start reading/writing */
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hsize_t nrecords; /* Number of records to read/write */
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int i;
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/* Define new values for the field "Pressure" */
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float pressure_in [NRECORDS_ADD] =
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{ 0.0f,1.0f,2.0f};
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int field_index_pre[1] = { 3 };
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int field_index_pos[2] = { 1,2 };
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/* Define new values for the fields "Latitude,Longitude" */
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Position position_in[NRECORDS_ADD] = { {0,0},
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{10,10},
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{20,20} };
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size_t field_sizes_pos[2]=
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{
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sizeof(position_in[0].longi),
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sizeof(position_in[0].lati)
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};
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size_t field_sizes_pre[1]=
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{
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sizeof(float)
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};
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/* Initialize the field field_type */
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string_type = H5Tcopy( H5T_C_S1 );
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H5Tset_size( string_type, 16 );
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field_type[0] = string_type;
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field_type[1] = H5T_NATIVE_INT;
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field_type[2] = H5T_NATIVE_INT;
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field_type[3] = H5T_NATIVE_FLOAT;
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field_type[4] = H5T_NATIVE_DOUBLE;
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/* Create a new file using default properties. */
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file_id = H5Fcreate( "ex_table_05.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT );
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/* Make the table */
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H5TBmake_table( "Table Title", file_id, TABLE_NAME,NFIELDS,NRECORDS,
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dst_size,field_names, dst_offset, field_type,
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chunk_size, fill_data, compress, p_data );
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/* Write the pressure field starting at record 2 */
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nfields = 1;
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start = 2;
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nrecords = NRECORDS_ADD;
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H5TBwrite_fields_index( file_id, TABLE_NAME, nfields, field_index_pre, start, nrecords,
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sizeof( float ), 0, field_sizes_pre, pressure_in );
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/* Write the new longitude and latitude information starting at record 2 */
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nfields = 2;
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start = 2;
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nrecords = NRECORDS_ADD;
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H5TBwrite_fields_index( file_id, TABLE_NAME, nfields, field_index_pos, start, nrecords,
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sizeof( Position ), field_offset_pos, field_sizes_pos, position_in );
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/* read the table */
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H5TBread_table( file_id, TABLE_NAME, dst_size, dst_offset, dst_sizes, dst_buf );
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/* print it by rows */
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for (i=0; i<NRECORDS; i++) {
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printf ("%-5s %-5d %-5d %-5f %-5f",
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dst_buf[i].name,
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dst_buf[i].lati,
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dst_buf[i].longi,
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dst_buf[i].pressure,
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dst_buf[i].temperature);
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printf ("\n");
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}
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/* close type */
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H5Tclose( string_type );
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/* close the file */
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H5Fclose( file_id );
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return 0;
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}
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