1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
|
//
// This example reads hyperslab from the SDS.h5 file into
// two-dimensional plane of a three-dimensional array. Various
// information about the dataset in the SDS.h5 file is obtained.
//
#include <string>
#ifndef H5_NO_NAMESPACE
using namespace std;
#endif
#ifdef OLD_HEADER_FILENAME
#include <iostream.h>
#else
#include <iostream>
#endif
#include "H5Cpp.h"
#ifndef H5_NO_NAMESPACE
using namespace H5;
#endif
const string FILE_NAME( "SDS.h5" );
const string DATASET_NAME( "IntArray" );
const int NX_SUB = 3; // hyperslab dimensions
const int NY_SUB = 4;
const int NX = 7; // output buffer dimensions
const int NY = 7;
const int NZ = 3;
const int RANK_OUT = 3;
int main (void)
{
//
// Output buffer initialization.
//
int i, j, k;
int data_out[NX][NY][NZ ]; /* output buffer */
for (j = 0; j < NX; j++)
{
for (i = 0; i < NY; i++)
{
for (k = 0; k < NZ ; k++)
data_out[j][i][k] = 0;
}
}
// Try block to detect exceptions raised by any of the calls inside it
try
{
//
// Open the specified file and the specified dataset in the file.
//
H5File file( FILE_NAME, H5F_ACC_RDONLY );
DataSet dataset = file.openDataSet( DATASET_NAME );
// Get the class of the datatype that is used by the dataset.
H5T_class_t type_class = dataset.getTypeClass();
// Get class of datatype and print message if it's an integer.
if( type_class == H5T_INTEGER )
{
cout << "Data set has INTEGER type" << endl;
// Get the integer datatype
IntType intype = dataset.getIntType();
// Get order of datatype and print message if it's a little endian.
string order_string;
H5T_order_t order = intype.getOrder( order_string );
cout << order_string << endl;
// Get size of the data element stored in file and print it.
size_t size = intype.getSize();
cout << "Data size is " << size << endl;
}
// Get dataspace of the dataset.
DataSpace dataspace = dataset.getSpace();
// Get the number of dimensions in the dataspace.
int rank = dataspace.getSimpleExtentNdims();
// Get the dimension size of each dimension in the dataspace and
// display them.
hsize_t dims_out[2];
int ndims = dataspace.getSimpleExtentDims( dims_out, NULL);
cout << "rank " << rank << ", dimensions " <<
(unsigned long)(dims_out[0]) << " x " <<
(unsigned long)(dims_out[1]) << endl;
// Define hyperslab in the dataset; implicitly giving strike and
// block NULL.
hssize_t offset[2]; // hyperslab offset in the file
hsize_t count[2]; // size of the hyperslab in the file
offset[0] = 1;
offset[1] = 2;
count[0] = NX_SUB;
count[1] = NY_SUB;
dataspace.selectHyperslab( H5S_SELECT_SET, count, offset );
// Define the memory dataspace.
hsize_t dimsm[3]; /* memory space dimensions */
dimsm[0] = NX;
dimsm[1] = NY;
dimsm[2] = NZ ;
DataSpace memspace( RANK_OUT, dimsm );
// Define memory hyperslab.
hssize_t offset_out[3]; // hyperslab offset in memory
hsize_t count_out[3]; // size of the hyperslab in memory
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;
memspace.selectHyperslab( H5S_SELECT_SET, count_out, offset_out );
// Read data from hyperslab in the file into the hyperslab in
// memory and display the data.
dataset.read( data_out, PredType::NATIVE_INT, memspace, dataspace );
for (j = 0; j < NX; j++)
{
for (i = 0; i < NY; i++)
cout << data_out[j][i][0] << " ";
cout << endl;
}
/*
* 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
*/
} // end of try block
// catch failure caused by the H5File operations
catch( FileIException error )
{
error.printError();
}
// catch failure caused by the DataSet operations
catch( DataSetIException error )
{
error.printError();
}
// catch failure caused by the DataSpace operations
catch( DataSpaceIException error )
{
error.printError();
}
// catch failure caused by the DataSpace operations
catch( DataTypeIException error )
{
error.printError();
}
return 0; // successfully terminated
}
|
