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
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
* Copyright by The HDF Group. *
* All rights reserved. *
* *
* This file is part of HDF Products. The full HDF copyright *
* notice, including terms governing use, modification, and redistribution, *
* is contained in the file, COPYING. COPYING can be found at the root of *
* the source code distribution tree. You can also access it online at *
* https://www.hdfgroup.org/licenses. If you do not have access to the *
* file, you may request a copy from help@hdfgroup.org. *
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
import hdf.hdflib.HDFConstants;
import hdf.hdflib.HDFLibrary;
/**
* <p>
* Title: HDF Native Package (Java) Example
* </p>
* <p>
* Description: this example shows how to create HDF4 datasets using the
* "HDF Native Package (Java)". The example creates the group structure and
* datasets:
*
* <pre>
* "/" (root)
* integer arrays
* 2D 32-bit integer 20x10
* 3D unsigned 8-bit integer 20x10x5
* float arrays
* 2D 64-bit double 20x10
* 3D 32-bit float 20x10x5
* </pre>
*
* Reference the C Example, VG_add_sds_to_vgroup.
* </p>
*/
public class HDF4DatasetCreate {
private static String fname = "HDF4DatasetCreate.hdf";
private static int[] dims2D = {20, 10};
private static int[] dims3D = {20, 10, 5};
public static void main(String args[]) throws Exception
{
long file_id = -1;
long vgroup_id1 = -1;
long vgroup_id2 = -1;
long sd_id = -1;
long sds_id = -1;
int sds_ref = -1;
// Create a new file using default properties.
try {
file_id = HDFLibrary.Hopen(fname, HDFConstants.DFACC_CREATE);
// Initialize the V interface.
HDFLibrary.Vstart(file_id);
}
catch (Exception e) {
e.printStackTrace();
System.err.println("Failed to create file:" + fname);
return;
}
// Create two vgroups and set their name and class.
try {
// Create the vgroup. Note that the vgroup reference number is set
// to -1 for creating and the access mode is "w" for writing.
vgroup_id1 = HDFLibrary.Vattach(file_id, -1, "w");
if (vgroup_id1 >= 0) {
HDFLibrary.Vsetname(vgroup_id1, "integer arrays");
HDFLibrary.Vsetclass(vgroup_id1, "Common Vgroups");
}
vgroup_id2 = HDFLibrary.Vattach(file_id, -1, "w");
if (vgroup_id2 >= 0) {
HDFLibrary.Vsetname(vgroup_id2, "float arrays");
HDFLibrary.Vsetclass(vgroup_id2, "Common Vgroups");
}
}
catch (Exception e) {
e.printStackTrace();
}
// Initialize the SD interface.
try {
sd_id = HDFLibrary.SDstart(fname, HDFConstants.DFACC_WRITE);
}
catch (Exception e) {
e.printStackTrace();
}
if (sd_id > 0) {
// create the SDS, 2D 32-bit (4 bytes) integer dataset of 20 by 10
try {
sds_id = HDFLibrary.SDcreate(sd_id, "2D 32-bit integer 20x10", (long)HDFConstants.DFNT_INT32,
2, dims2D);
if (sds_id >= 0) {
// Obtain the reference number of the SDS using its identifier.
sds_ref = HDFLibrary.SDidtoref(sds_id);
System.out.println("sds_ref:" + sds_ref);
// Add the SDS to the vgroup. Note: the tag DFTAG_NDG is used
// when adding an SDS. Refer to Appendix A for the entire list of tags.
HDFLibrary.Vaddtagref(vgroup_id1, HDFConstants.DFTAG_NDG, sds_ref);
// Terminate access to the data set.
HDFLibrary.SDendaccess(sds_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
try {
// create 3D 8-bit (1 byte) unsigned integer dataset of 20 by 10 by 5
sds_id = HDFLibrary.SDcreate(sd_id, "3D 8-bit unsigned integer 20x10x5",
(long)HDFConstants.DFNT_INT8, 3, dims3D);
if (sds_id >= 0) {
// Obtain the reference number of the SDS using its identifier.
sds_ref = HDFLibrary.SDidtoref(sds_id);
System.out.println("sds_ref:" + sds_ref);
// Add the SDS to the vgroup. Note: the tag DFTAG_NDG is used
// when adding an SDS. Refer to Appendix A for the entire list of tags.
HDFLibrary.Vaddtagref(vgroup_id1, HDFConstants.DFTAG_NDG, sds_ref);
// Terminate access to the data set.
HDFLibrary.SDendaccess(sds_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
try {
// create 2D 64-bit (8 bytes) double dataset of 20 by 10
sds_id = HDFLibrary.SDcreate(sd_id, "2D 64-bit double 20x10", HDFConstants.DFNT_FLOAT64, 2,
dims2D);
if (sds_id >= 0) {
// Obtain the reference number of the SDS using its identifier.
sds_ref = HDFLibrary.SDidtoref(sds_id);
System.out.println("sds_ref:" + sds_ref);
// Add the SDS to the vgroup. Note: the tag DFTAG_NDG is used
// when adding an SDS. Refer to Appendix A for the entire list of tags.
HDFLibrary.Vaddtagref(vgroup_id2, HDFConstants.DFTAG_NDG, sds_ref);
// Terminate access to the data set.
HDFLibrary.SDendaccess(sds_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
try {
// create 3D 32-bit (4 bytes) float dataset of 20 by 10 by 5
sds_id = HDFLibrary.SDcreate(sd_id, "3D 32-bit float 20x10x5", HDFConstants.DFNT_FLOAT32, 3,
dims3D);
if (sds_id >= 0) {
// Obtain the reference number of the SDS using its identifier.
sds_ref = HDFLibrary.SDidtoref(sds_id);
System.out.println("sds_ref:" + sds_ref);
// Add the SDS to the vgroup. Note: the tag DFTAG_NDG is used
// when adding an SDS. Refer to Appendix A for the entire list of tags.
HDFLibrary.Vaddtagref(vgroup_id2, HDFConstants.DFTAG_NDG, sds_ref);
// Terminate access to the data set.
HDFLibrary.SDendaccess(sds_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
// Terminate access to the SD interface and close the file.
try {
HDFLibrary.SDend(sd_id);
}
catch (Exception e) {
e.printStackTrace();
}
}
else {
System.err.println("Could not initialize SDS interface");
}
// Close the groups.
try {
if (vgroup_id2 >= 0)
HDFLibrary.Vdetach(vgroup_id2);
}
catch (Exception e) {
e.printStackTrace();
}
try {
if (vgroup_id1 >= 0)
HDFLibrary.Vdetach(vgroup_id1);
}
catch (Exception e) {
e.printStackTrace();
}
// Close the file.
try {
if (file_id >= 0) {
HDFLibrary.Vend(file_id);
HDFLibrary.Hclose(file_id);
}
}
catch (Exception e) {
e.printStackTrace();
}
}
}
|
