mirror of
https://github.com/HDFGroup/hdf5.git
synced 2024-11-27 02:10:55 +08:00
e8ed850fa8
Purpose:
Bug fix
Description:
All examples used "FILE" string in the #define preprocessor
directive. That caused error on Windows platforms since
FILE is a structure returned by fopen calls.
Solution:
Changed "FILE" to "H5FILE_NAME"
Platforms tested:
Linux (eirene)
313 lines
10 KiB
C
313 lines
10 KiB
C
/*
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* This program shows how the H5Sselect_hyperslab and H5Sselect_elements
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* functions are used to write selected data from memory to the file.
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* Program takes 48 elements from the linear buffer and writes them into
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* the matrix using 3x2 blocks, (4,3) stride and (2,4) count.
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* Then four elements of the matrix are overwritten with the new values and
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* file is closed. Program reopens the file and selects the union of two
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* hyperslabs in the dataset in the file. Then it reads the selection into the
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* memory dataset preserving the shape of the selection.
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*/
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#include "hdf5.h"
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#define H5FILE_NAME "Select.h5"
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#define MSPACE1_RANK 1 /* Rank of the first dataset in memory */
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#define MSPACE1_DIM 50 /* Dataset size in memory */
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#define MSPACE2_RANK 1 /* Rank of the second dataset in memory */
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#define MSPACE2_DIM 4 /* Dataset size in memory */
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#define FSPACE_RANK 2 /* Dataset rank as it is stored in the file */
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#define FSPACE_DIM1 8 /* Dimension sizes of the dataset as it is
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stored in the file */
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#define FSPACE_DIM2 12
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/* We will read dataset back from the file
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to the dataset in memory with these
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dataspace parameters. */
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#define MSPACE_RANK 2
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#define MSPACE_DIM1 8
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#define MSPACE_DIM2 9
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#define NPOINTS 4 /* Number of points that will be selected
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and overwritten */
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int
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main (void)
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{
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hid_t file, dataset; /* File and dataset identifiers */
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hid_t mid1, mid2, mid, fid; /* Dataspace identifiers */
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hid_t plist; /* Dataset property list identifier */
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hsize_t dim1[] = {MSPACE1_DIM}; /* Dimension size of the first dataset
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(in memory) */
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hsize_t dim2[] = {MSPACE2_DIM}; /* Dimension size of the second dataset
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(in memory */
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hsize_t fdim[] = {FSPACE_DIM1, FSPACE_DIM2};
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/* Dimension sizes of the dataset (on disk) */
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hsize_t mdim[] = {MSPACE_DIM1, MSPACE_DIM2}; /* Dimension sizes of the
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dataset in memory when we
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read selection from the
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dataset on the disk */
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hssize_t start[2]; /* Start of hyperslab */
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hsize_t stride[2]; /* Stride of hyperslab */
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hsize_t count[2]; /* Block count */
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hsize_t block[2]; /* Block sizes */
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hssize_t coord[NPOINTS][FSPACE_RANK]; /* Array to store selected points
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from the file dataspace */
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herr_t ret;
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unsigned i,j;
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int fillvalue = 0; /* Fill value for the dataset */
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int matrix_out[MSPACE_DIM1][MSPACE_DIM2]; /* Buffer to read from the
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dataset */
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int vector[MSPACE1_DIM];
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int values[] = {53, 59, 61, 67}; /* New values to be written */
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/*
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* Buffers' initialization.
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*/
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vector[0] = vector[MSPACE1_DIM - 1] = -1;
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for (i = 1; i < MSPACE1_DIM - 1; i++) vector[i] = i;
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/*
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* Create a file.
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*/
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file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
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/*
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* Create property list for a dataset and set up fill values.
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*/
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plist = H5Pcreate(H5P_DATASET_CREATE);
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ret = H5Pset_fill_value(plist, H5T_NATIVE_INT, &fillvalue);
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/*
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* Create dataspace for the dataset in the file.
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*/
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fid = H5Screate_simple(FSPACE_RANK, fdim, NULL);
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/*
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* Create dataset in the file. Notice that creation
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* property list plist is used.
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*/
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dataset = H5Dcreate(file, "Matrix in file", H5T_NATIVE_INT, fid, plist);
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/*
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* Select hyperslab for the dataset in the file, using 3x2 blocks,
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* (4,3) stride and (2,4) count starting at the position (0,1).
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*/
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start[0] = 0; start[1] = 1;
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stride[0] = 4; stride[1] = 3;
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count[0] = 2; count[1] = 4;
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block[0] = 3; block[1] = 2;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Create dataspace for the first dataset.
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*/
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mid1 = H5Screate_simple(MSPACE1_RANK, dim1, NULL);
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/*
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* Select hyperslab.
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* We will use 48 elements of the vector buffer starting at the second element.
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* Selected elements are 1 2 3 . . . 48
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*/
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start[0] = 1;
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stride[0] = 1;
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count[0] = 48;
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block[0] = 1;
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ret = H5Sselect_hyperslab(mid1, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Write selection from the vector buffer to the dataset in the file.
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*
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* File dataset should look like this:
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* 0 1 2 0 3 4 0 5 6 0 7 8
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* 0 9 10 0 11 12 0 13 14 0 15 16
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* 0 17 18 0 19 20 0 21 22 0 23 24
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* 0 0 0 0 0 0 0 0 0 0 0 0
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* 0 25 26 0 27 28 0 29 30 0 31 32
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* 0 33 34 0 35 36 0 37 38 0 39 40
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* 0 41 42 0 43 44 0 45 46 0 47 48
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* 0 0 0 0 0 0 0 0 0 0 0 0
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*/
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ret = H5Dwrite(dataset, H5T_NATIVE_INT, mid1, fid, H5P_DEFAULT, vector);
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/*
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* Reset the selection for the file dataspace fid.
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*/
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ret = H5Sselect_none(fid);
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/*
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* Create dataspace for the second dataset.
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*/
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mid2 = H5Screate_simple(MSPACE2_RANK, dim2, NULL);
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/*
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* Select sequence of NPOINTS points in the file dataspace.
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*/
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coord[0][0] = 0; coord[0][1] = 0;
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coord[1][0] = 3; coord[1][1] = 3;
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coord[2][0] = 3; coord[2][1] = 5;
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coord[3][0] = 5; coord[3][1] = 6;
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ret = H5Sselect_elements(fid, H5S_SELECT_SET, NPOINTS,
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(const hssize_t **)coord);
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/*
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* Write new selection of points to the dataset.
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*/
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ret = H5Dwrite(dataset, H5T_NATIVE_INT, mid2, fid, H5P_DEFAULT, values);
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/*
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* File dataset should look like this:
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* 53 1 2 0 3 4 0 5 6 0 7 8
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* 0 9 10 0 11 12 0 13 14 0 15 16
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* 0 17 18 0 19 20 0 21 22 0 23 24
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* 0 0 0 59 0 61 0 0 0 0 0 0
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* 0 25 26 0 27 28 0 29 30 0 31 32
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* 0 33 34 0 35 36 67 37 38 0 39 40
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* 0 41 42 0 43 44 0 45 46 0 47 48
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* 0 0 0 0 0 0 0 0 0 0 0 0
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*
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*/
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/*
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* Close memory file and memory dataspaces.
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*/
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ret = H5Sclose(mid1);
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ret = H5Sclose(mid2);
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ret = H5Sclose(fid);
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/*
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* Close dataset.
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*/
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ret = H5Dclose(dataset);
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/*
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* Close the file.
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*/
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ret = H5Fclose(file);
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/*
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* Open the file.
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*/
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file = H5Fopen(H5FILE_NAME, H5F_ACC_RDONLY, H5P_DEFAULT);
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/*
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* Open the dataset.
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*/
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dataset = H5Dopen(file,"Matrix in file");
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/*
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* Get dataspace of the open dataset.
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*/
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fid = H5Dget_space(dataset);
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/*
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* Select first hyperslab for the dataset in the file. The following
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* elements are selected:
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* 10 0 11 12
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* 18 0 19 20
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* 0 59 0 61
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*
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*/
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start[0] = 1; start[1] = 2;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 3; count[1] = 4;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_SET, start, stride, count, block);
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/*
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* Add second selected hyperslab to the selection.
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* The following elements are selected:
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* 19 20 0 21 22
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* 0 61 0 0 0
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* 27 28 0 29 30
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* 35 36 67 37 38
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* 43 44 0 45 46
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* 0 0 0 0 0
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* Note that two hyperslabs overlap. Common elements are:
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* 19 20
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* 0 61
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*/
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start[0] = 2; start[1] = 4;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 6; count[1] = 5;
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ret = H5Sselect_hyperslab(fid, H5S_SELECT_OR, start, stride, count, block);
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/*
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* Create memory dataspace.
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*/
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mid = H5Screate_simple(MSPACE_RANK, mdim, NULL);
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/*
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* Select two hyperslabs in memory. Hyperslabs has the same
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* size and shape as the selected hyperslabs for the file dataspace.
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*/
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start[0] = 0; start[1] = 0;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 3; count[1] = 4;
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ret = H5Sselect_hyperslab(mid, H5S_SELECT_SET, start, stride, count, block);
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start[0] = 1; start[1] = 2;
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block[0] = 1; block[1] = 1;
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stride[0] = 1; stride[1] = 1;
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count[0] = 6; count[1] = 5;
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ret = H5Sselect_hyperslab(mid, H5S_SELECT_OR, start, stride, count, block);
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/*
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* Initialize data buffer.
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*/
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for (i = 0; i < MSPACE_DIM1; i++) {
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for (j = 0; j < MSPACE_DIM2; j++)
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matrix_out[i][j] = 0;
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}
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/*
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* Read data back to the buffer matrix_out.
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*/
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ret = H5Dread(dataset, H5T_NATIVE_INT, mid, fid,
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H5P_DEFAULT, matrix_out);
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/*
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* Display the result. Memory dataset is:
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*
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* 10 0 11 12 0 0 0 0 0
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* 18 0 19 20 0 21 22 0 0
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* 0 59 0 61 0 0 0 0 0
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* 0 0 27 28 0 29 30 0 0
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* 0 0 35 36 67 37 38 0 0
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* 0 0 43 44 0 45 46 0 0
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* 0 0 0 0 0 0 0 0 0
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* 0 0 0 0 0 0 0 0 0
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*/
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for (i=0; i < MSPACE_DIM1; i++) {
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for(j=0; j < MSPACE_DIM2; j++) printf("%3d ", matrix_out[i][j]);
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printf("\n");
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}
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/*
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* Close memory file and memory dataspaces.
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*/
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ret = H5Sclose(mid);
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ret = H5Sclose(fid);
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/*
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* Close dataset.
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*/
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ret = H5Dclose(dataset);
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/*
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* Close the file.
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*/
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ret = H5Fclose(file);
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return 0;
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}
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