mirror of
https://github.com/HDFGroup/hdf5.git
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[svn-r229] New examples have been created in the examples directory:
h5_write.c - stores INT array as INT32 little endian dataset in the HDF5 file.
h5_read.c - gets info about the dataset;
reads hyperslab from the dataset in the file into
2-dim slice of the 3 dimensional array.
h5_compund.c - creates compound dataset and writes it to the file;
reads subsets of the dataset.
h5_extend_write.c - writes extendable dataset.
h5_extend_read.c - gets info about the dataset;
reads dataset and one of the chunks.
This commit is contained in:
Elena Pourmal
parent
08cd0cc138
commit
35e7a062e2
155
examples/h5_compound.c
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155
examples/h5_compound.c
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@ -0,0 +1,155 @@
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/*
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* This example shows how to create a compound data type,
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* write an array which has the compound data type to the file,
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* and read back fields' subsets.
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*/
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#include "hdf5.h"
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#define FILE "SDScompound.h5"
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#define DATASETNAME "ArrayOfStructures"
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#define LENGTH 10
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#define RANK 1
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main()
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{
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/* First structure and dataset*/
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typedef struct s1_t {
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int a;
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float b;
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double c;
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} s1_t;
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s1_t s1[LENGTH];
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hid_t s1_tid; /* File datatype hadle */
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/* Second structure (subset of s1_t) and dataset*/
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typedef struct s2_t {
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double c;
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int a;
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} s2_t;
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s2_t s2[LENGTH];
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hid_t s2_tid; /* Memory datatype handle */
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/* Third "structure" ( will be used to read float field of s1) */
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hid_t s3_tid; /* Memory datatype handle */
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float s3[LENGTH];
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int i;
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hid_t file, datatype, dataset, space; /* Handles */
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herr_t status;
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size_t dim[] = {LENGTH}; /* Dataspace dimensions */
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H5T_class_t class;
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size_t size;
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/*
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* Initialize the data
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*/
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for (i = 0; i< LENGTH; i++) {
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s1[i].a = i;
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s1[i].b = i*i;
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s1[i].c = 1./(i+1);
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}
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/*
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* Create the data space.
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*/
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space = H5Pcreate_simple(RANK, dim, NULL);
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/*
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* Create the file.
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*/
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file = H5Fcreate(FILE, H5ACC_OVERWRITE, H5C_DEFAULT, H5C_DEFAULT);
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/*
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* Create the memory data type.
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*/
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s1_tid = H5Tcreate (H5T_COMPOUND, sizeof(s1_t));
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status = H5Tinsert(s1_tid, "a_name", HPOFFSET(s1, a), H5T_NATIVE_INT);
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status = H5Tinsert(s1_tid, "c_name", HPOFFSET(s1, c), H5T_NATIVE_DOUBLE);
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status = H5Tinsert(s1_tid, "b_name", HPOFFSET(s1, b), H5T_NATIVE_FLOAT);
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/*
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* Create the dataset.
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*/
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dataset = H5Dcreate(file, DATASETNAME, s1_tid, space, H5C_DEFAULT);
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/*
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* Wtite data to the dataset;
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*/
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status = H5Dwrite(dataset, s1_tid, H5P_ALL, H5P_ALL, H5C_DEFAULT, s1);
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/*
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* Release resources
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*/
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H5Tclose(s1_tid);
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H5Pclose(space);
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H5Dclose(dataset);
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H5Fclose(file);
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/*
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* Open the file and the dataset.
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*/
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file = H5Fopen(FILE, H5ACC_DEFAULT, H5C_DEFAULT);
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dataset = H5Dopen(file, DATASETNAME);
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/*
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* Create a data type for s2
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*/
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s2_tid = H5Tcreate(H5T_COMPOUND, sizeof(s2_t));
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status = H5Tinsert(s2_tid, "c_name", HPOFFSET(s2, c), H5T_NATIVE_DOUBLE);
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status = H5Tinsert(s2_tid, "a_name", HPOFFSET(s2, a), H5T_NATIVE_INT);
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/*
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* Read two fields c and a from s1 dataset. Fields iin the file
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* are found by their names "c_name" and "a_name".
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*/
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status = H5Dread(dataset, s2_tid, H5P_ALL, H5P_ALL, H5C_DEFAULT, s2);
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/*
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* Display the fields
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*/
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printf("\n");
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printf("Field c : \n");
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for( i = 0; i < LENGTH; i++) printf("%.4f ", s2[i].c);
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printf("\n");
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printf("\n");
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printf("Field a : \n");
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for( i = 0; i < LENGTH; i++) printf("%d ", s2[i].a);
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printf("\n");
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/*
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* Create a data type for s3.
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*/
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s3_tid = H5Tcreate(H5T_COMPOUND, sizeof(float));
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status = H5Tinsert(s3_tid, "b_name", 0, H5T_NATIVE_FLOAT);
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/*
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* Read field b from s1 dataset. Field in the file is found by its name.
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*/
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status = H5Dread(dataset, s3_tid, H5P_ALL, H5P_ALL, H5C_DEFAULT, s3);
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/*
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* Display the field
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*/
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printf("\n");
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printf("Field b : \n");
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for( i = 0; i < LENGTH; i++) printf("%.4f ", s3[i]);
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printf("\n");
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/*
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* Release resources
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*/
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H5Tclose(s2_tid);
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H5Tclose(s3_tid);
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H5Dclose(dataset);
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H5Pclose(space);
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H5Fclose(file);
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}
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141
examples/h5_extend_read.c
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141
examples/h5_extend_read.c
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@ -0,0 +1,141 @@
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/*
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* This example shows how to work with extendable dataset.
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* In the current version of the library dataset MUST be
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* chunked.
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*
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*/
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#include "hdf5.h"
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#define FILE "SDSextendable.h5"
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#define DATASETNAME "ExtendableArray"
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#define RANK 2
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#define NX 10
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#define NY 5
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main ()
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{
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hid_t file; /* handles */
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hid_t datatype, dataset;
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hid_t filespace;
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hid_t memspace;
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hid_t cparms;
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H5T_class_t class; /* data type class */
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size_t elem_size; /* size of the data element
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stored in file */
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size_t dims[2]; /* dataset and chunk dimensions */
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size_t chunk_dims[2];
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size_t size[2];
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size_t count[2];
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int offset[2];
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herr_t status, status_n;
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int data_out[NX][NY]; /* buffer for dataset to be read */
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int chunk_out[2][5]; /* buffer for chunk to be read */
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int i, j, rank, rank_chunk;
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/*
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* Open the file and the dataset.
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*/
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file = H5Fopen(FILE, H5ACC_DEFAULT, H5C_DEFAULT);
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dataset = H5Dopen(file, DATASETNAME);
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/*
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* Get dataset rank and dimension.
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*/
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filespace = H5Dget_space(dataset); /* Get filespace handle first. */
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rank = H5Pget_ndims(filespace);
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status_n = H5Pget_dims(filespace, dims);
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printf("dataset rank %d, dimensions %d x %d \n", rank, dims[0], dims[1]);
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/*
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* Get creation properties.
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*/
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cparms = H5Dget_create_parms(dataset); /* Get properties handle first. */
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/*
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* Get chunking information: rank and dimensions
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*/
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rank_chunk = H5Cget_chunk(cparms, 2, chunk_dims);
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printf("chunk rank %d, dimensions %d x %d \n", rank_chunk,
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chunk_dims[0], chunk_dims[1]);
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/*
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* Define the memory filespace to read dataset.
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*/
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memspace = H5Pcreate_simple(RANK,dims,NULL);
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/*
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* Read dataset back and display.
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*/
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status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
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H5C_DEFAULT, data_out);
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printf("\n");
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printf("Dataset: \n");
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for (j = 0; j < dims[0]; j++) {
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for (i = 0; i < dims[1]; i++) printf("%d ", data_out[j][i]);
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printf("\n");
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}
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/*
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dataset rank 2, dimensions 10 x 5
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chunk rank 2, dimensions 2 x 5
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Dataset:
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1 1 1 3 3
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1 1 1 3 3
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1 1 1 0 0
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2 0 0 0 0
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2 0 0 0 0
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2 0 0 0 0
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2 0 0 0 0
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2 0 0 0 0
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2 0 0 0 0
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2 0 0 0 0
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*/
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/*
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* Define the memory filespace to read a chunk.
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*/
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memspace = H5Pcreate_simple(rank_chunk,chunk_dims,NULL);
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/*
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* Define chunk in the file (hyperslab) to read.
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*/
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offset[0] = 2;
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offset[1] = 0;
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count[0] = chunk_dims[0];
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count[1] = chunk_dims[1];
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status = H5Pset_hyperslab(filespace, offset, count, NULL);
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/*
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* Read chunk back and display.
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*/
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status = H5Dread(dataset, H5T_NATIVE_INT, memspace, filespace,
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H5C_DEFAULT, chunk_out);
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printf("\n");
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printf("Chunk: \n");
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for (j = 0; j < chunk_dims[0]; j++) {
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for (i = 0; i < chunk_dims[1]; i++) printf("%d ", chunk_out[j][i]);
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printf("\n");
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}
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/*
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Chunk:
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1 1 1 0 0
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2 0 0 0 0
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*/
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/*
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* Close/release resources.
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*/
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H5Dclose(dataset);
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H5Pclose(filespace);
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H5Pclose(memspace);
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H5Fclose(file);
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}
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150
examples/h5_extend_write.c
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150
examples/h5_extend_write.c
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/*
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* This example shows how to work with extendable dataset.
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* In the current version of the library dataset MUST be
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* chunked.
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*
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*/
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#include "hdf5.h"
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#define FILE "SDSextendable.h5"
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#define DATASETNAME "ExtendableArray"
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#define RANK 2
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#define NX 10
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#define NY 5
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main ()
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{
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hid_t file; /* handles */
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hid_t datatype, dataspace, dataset;
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hid_t filespace;
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hid_t cparms;
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size_t dims[2] = { 3, 3}; /* dataset dimensions
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at the creation time */
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size_t dims1[2] = { 3, 3}; /* data1 dimensions */
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size_t dims2[2] = { 7, 1}; /* data2 dimensions */
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size_t dims3[2] = { 2, 2}; /* data3 dimensions */
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size_t maxdims[2] = {H5P_UNLIMITED, H5P_UNLIMITED};
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size_t chunk_dims[2] ={2, 5};
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size_t size[2];
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int offset[2];
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herr_t status;
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int data1[3][3] = { 1, 1, 1, /* data to write */
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1, 1, 1,
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1, 1, 1 };
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int data2[7] = { 2, 2, 2, 2, 2, 2, 2};
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int data3[2][2] = { 3, 3,
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3, 3};
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/*
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* Create the data space with ulimited dimensions.
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*/
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dataspace = H5Pcreate_simple(RANK, dims, maxdims);
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/*
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* Create a new file. If file exists its contents will be overwritten.
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*/
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file = H5Fcreate(FILE, H5ACC_OVERWRITE, H5C_DEFAULT, H5C_DEFAULT);
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/*
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* Modify dataset creation properties, i.e. enable chunking.
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*/
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cparms = H5Ccreate (H5C_DATASET_CREATE);
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status = H5Cset_chunk( cparms, RANK, chunk_dims);
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/*
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* Create a new dataset within the file using cparms
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* creation properties.
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*/
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dataset = H5Dcreate(file, DATASETNAME, H5T_NATIVE_INT, dataspace,
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cparms);
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/*
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* Extend the dataset. This call assures that dataset is at least 3 x 3.
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*/
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size[0] = 3;
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size[1] = 3;
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab.
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 0;
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offset[1] = 0;
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status = H5Pset_hyperslab(filespace, offset, dims1, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5C_DEFAULT, data1);
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/*
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* Extend the dataset. Dataset becomes 7 x 3.
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*/
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dims[0] = dims1[0] + dims2[0];
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size[0] = dims[0];
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size[1] = dims[1];
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab.
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 3;
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offset[1] = 0;
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status = H5Pset_hyperslab(filespace, offset, dims2, NULL);
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/*
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* Define memory space
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*/
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dataspace = H5Pcreate_simple(RANK, dims2, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5C_DEFAULT, data2);
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/*
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* Extend the dataset. Dataset becomes 7 x 5.
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*/
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dims[1] = dims1[1] + dims3[1];
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size[0] = dims[0];
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size[1] = dims[1];
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status = H5Dextend (dataset, size);
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/*
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* Select a hyperslab
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*/
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filespace = H5Dget_space (dataset);
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offset[0] = 0;
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offset[1] = 3;
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status = H5Pset_hyperslab(filespace, offset, dims3, NULL);
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/*
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* Define memory space.
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*/
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dataspace = H5Pcreate_simple(RANK, dims3, NULL);
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/*
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* Write the data to the hyperslab.
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*/
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status = H5Dwrite(dataset, H5T_NATIVE_INT, dataspace, filespace,
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H5C_DEFAULT, data3);
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/*
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* Close/release resources.
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*/
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H5Dclose(dataset);
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H5Pclose(dataspace);
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H5Pclose(filespace);
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H5Fclose(file);
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}
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128
examples/h5_read.c
Normal file
128
examples/h5_read.c
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/*
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* This example reads hyperslab from the SDS.h5 file
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* created by h5_write.c program into two-dimensional
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* plane of the tree-dimensional array.
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* Information about dataset in the SDS.h5 file is obtained.
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*/
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#include "hdf5.h"
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#define FILE "SDS.h5"
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#define DATASETNAME "IntArray"
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#define NX_SUB 3 /* hyperslab dimensions */
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#define NY_SUB 4
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#define NX 7 /* output buffer dimensions */
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#define NY 7
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#define NZ 3
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#define RANK 2
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#define RANK_OUT 3
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main ()
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{
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hid_t file, dataset; /* handles */
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hid_t datatype, dataspace;
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hid_t memspace;
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H5T_class_t class; /* data type class */
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H5T_order_t order; /* data order */
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size_t size; /* size of the data element
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stored in file */
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size_t dimsm[3]; /* memory space dimensions */
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size_t dims_out[2]; /* dataset dimensions */
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herr_t status;
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int data_out[NX][NY][NZ ]; /* output buffer */
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size_t count[2]; /* size of the hyperslab in the file */
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int offset[2]; /* hyperslab offset in the file */
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size_t count_out[3]; /* size of the hyperslab in memory */
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int offset_out[3]; /* hyperslab offset in memory */
|
||||
int i, j, k, status_n, rank;
|
||||
|
||||
for (j = 0; j < NX; j++) {
|
||||
for (i = 0; i < NY; i++) {
|
||||
for (k = 0; k < NZ ; k++)
|
||||
data_out[j][i][k] = 0;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Open the file and the dataset.
|
||||
*/
|
||||
file = H5Fopen(FILE, H5ACC_DEFAULT, H5C_DEFAULT);
|
||||
dataset = H5Dopen(file, DATASETNAME);
|
||||
|
||||
/*
|
||||
* Get datatype and dataspace handles and then query
|
||||
* dataset class, order, size, rank and dimensions.
|
||||
*/
|
||||
|
||||
datatype = H5Dget_type(dataset); /* datatype handle */
|
||||
class = H5Tget_class(datatype);
|
||||
if (class == H5T_INTEGER) printf("Data set has INTEGER type \n");
|
||||
order = H5Tget_order(datatype);
|
||||
if (order == H5T_ORDER_LE) printf("Little endian order \n");
|
||||
|
||||
size = H5Tget_size(datatype);
|
||||
printf(" Data size is %d \n", size);
|
||||
|
||||
dataspace = H5Dget_space(dataset); /* dataspace handle */
|
||||
rank = H5Pget_ndims(dataspace);
|
||||
status_n = H5Pget_dims(dataspace, dims_out);
|
||||
printf("rank %d, dimensions %d x %d \n", rank, dims_out[0], dims_out[1]);
|
||||
|
||||
/*
|
||||
* Define hyperslab in the datatset.
|
||||
*/
|
||||
offset[0] = 1;
|
||||
offset[1] = 2;
|
||||
count[0] = NX_SUB;
|
||||
count[1] = NY_SUB;
|
||||
status = H5Pset_hyperslab(dataspace, offset, count, NULL);
|
||||
|
||||
/*
|
||||
* Define the memory dataspace.
|
||||
*/
|
||||
dimsm[0] = NX;
|
||||
dimsm[1] = NY;
|
||||
dimsm[2] = NZ ;
|
||||
memspace = H5Pcreate_simple(RANK_OUT,dimsm,NULL);
|
||||
|
||||
/*
|
||||
* Define memory hyperslab.
|
||||
*/
|
||||
offset_out[0] = 3;
|
||||
offset_out[1] = 0;
|
||||
offset_out[2] = 0;
|
||||
count_out[0] = NX_SUB;
|
||||
count_out[1] = NY_SUB;
|
||||
count_out[2] = 1;
|
||||
status = H5Pset_hyperslab(memspace, offset_out, count_out, NULL);
|
||||
|
||||
/*
|
||||
* Read data from hyperslab in the file into the hyperslab in
|
||||
* memory and display.
|
||||
*/
|
||||
status = H5Dread(dataset, H5T_NATIVE_INT, memspace, dataspace,
|
||||
H5C_DEFAULT, data_out);
|
||||
for (j = 0; j < NX; j++) {
|
||||
for (i = 0; i < NY; i++) printf("%d ", data_out[j][i][0]);
|
||||
printf("\n");
|
||||
}
|
||||
/* 0 0 0 0 0 0 0
|
||||
0 0 0 0 0 0 0
|
||||
0 0 0 0 0 0 0
|
||||
3 4 5 6 0 0 0
|
||||
4 5 6 7 0 0 0
|
||||
5 6 7 8 0 0 0
|
||||
0 0 0 0 0 0 0 */
|
||||
|
||||
/*
|
||||
* Close/release resources.
|
||||
*/
|
||||
H5Tclose(datatype);
|
||||
H5Dclose(dataset);
|
||||
H5Pclose(dataspace);
|
||||
H5Pclose(memspace);
|
||||
H5Fclose(file);
|
||||
|
||||
}
|
||||
78
examples/h5_write.c
Normal file
78
examples/h5_write.c
Normal file
@ -0,0 +1,78 @@
|
||||
/*
|
||||
* This example writes data to HDF5 file.
|
||||
* Data conversion is performed during write operation.
|
||||
*/
|
||||
|
||||
#include "hdf5.h"
|
||||
|
||||
#define FILE "SDS.h5"
|
||||
#define DATASETNAME "IntArray"
|
||||
#define NX 5 /* dataset dimensions */
|
||||
#define NY 6
|
||||
#define RANK 2
|
||||
|
||||
main ()
|
||||
{
|
||||
hid_t file, dataset; /* file and dataset handles */
|
||||
hid_t datatype, dataspace; /* handles */
|
||||
size_t dimsf[2]; /* dataset dimensions */
|
||||
herr_t status;
|
||||
int data[NX][NY]; /* data to write */
|
||||
int i, j;
|
||||
|
||||
/*
|
||||
* Data and output buffer initialization.
|
||||
*/
|
||||
|
||||
for (j = 0; j < NX; j++) {
|
||||
for (i = 0; i < NY; i++)
|
||||
data[j][i] = i + j;
|
||||
}
|
||||
/* 0 1 2 3 4 5
|
||||
1 2 3 4 5 6
|
||||
2 3 4 5 6 7
|
||||
3 4 5 6 7 8
|
||||
4 5 6 7 8 9 */
|
||||
|
||||
/*
|
||||
* Create a new file using H5ACC_OVERWRITE access,
|
||||
* default file creation properties, and default file
|
||||
* access properties.
|
||||
*/
|
||||
file = H5Fcreate(FILE, H5ACC_DEFAULT, H5C_DEFAULT, H5C_DEFAULT);
|
||||
|
||||
/*
|
||||
* Describe the size of the array and create the data space for fixed
|
||||
* size dataset.
|
||||
*/
|
||||
dimsf[0] = NX;
|
||||
dimsf[1] = NY;
|
||||
dataspace = H5Pcreate_simple(RANK, dimsf, NULL);
|
||||
|
||||
/*
|
||||
* Define datatype for the data in the file.
|
||||
* We will store liitle endian INT32 numbers.
|
||||
*/
|
||||
datatype = H5Tcopy(H5T_NATIVE_INT32);
|
||||
status = H5Tset_order(datatype, H5T_ORDER_LE);
|
||||
/*
|
||||
* Create a new dataset within the file using defined dataspace and
|
||||
* datatype and default dataset creation properties.
|
||||
*/
|
||||
dataset = H5Dcreate(file, DATASETNAME, datatype, dataspace,
|
||||
H5C_DEFAULT);
|
||||
|
||||
/*
|
||||
* Write the data to the dataset using default transfer properties.
|
||||
*/
|
||||
status = H5Dwrite(dataset, H5T_NATIVE_INT, H5P_ALL, H5P_ALL,
|
||||
H5C_DEFAULT, data);
|
||||
|
||||
/*
|
||||
* Close/release resources.
|
||||
*/
|
||||
H5Dclose(dataset);
|
||||
H5Pclose(dataspace);
|
||||
H5Fclose(file);
|
||||
|
||||
}
|
||||
Loading…
x
Reference in New Issue
Block a user