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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347
|
Example 1: Create a simple fixed size 3-D dataspace in memory and on disk and
copy the entire dataset to disk.
{
hid_t file; /* File ID */
hid_t dataset; /* Dataset ID */
hid_t mem_space, file_space; /* Dataspaces for memory and the file */
uint8 *buf; /* Buffer for data */
hsize_t curr_dims[3]={3,4,5}; /* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example1.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace for dataset in the file */
/* Selection for dataspace defaults to entire space */
file_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the dataset's dataspace */
H5Sset_extent_simple(file_space,3,curr_dims,curr_dims);
/* Create the dataspace for the dataset in memory */
/* Selection for dataspace defaults to entire space */
mem_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the memory dataspace */
H5Sset_extent_simple(mem_space,3,curr_dims,curr_dims);
/* Create the dataset on disk */
dataset=H5Dcreate(file,"Dataset",H5T_NATIVE_UINT8,file_space,H5P_DEFAULT);
/* Write the dataset to the file */
H5Dwrite(dataset,H5T_NATIVE_UINT8,mem_space,file_space,H5P_DEFAULT,buf);
/* Close dataspaces */
H5Sclose(mem_space);
H5Sclose(file_space);
/* Close dataset & file */
H5Dclose(dataset);
H5Fclose(file);
}
Example 2: Create a simple fixed size 3-D dataspace in memory and on disk and
copy a hyperslab to disk. The hyperslab blocks are packed and
contiguous in memory, but are scattered when written to the dataset
on disk.
{
hid_t file; /* File ID */
hid_t dataset; /* Dataset ID */
hid_t mem_space, file_space; /* Dataspaces for memory and the file */
uint8 *buf; /* Buffer for data */
hsize_t start[3]={3,4,5}; /* Start of hyperslab */
hsize_t stride[3]={1,2,2}; /* Stride for hyperslab */
hsize_t count[3]={3,3,3}; /* Hyperslab block count in each dimension */
hsize_t block[3]={2,2,2}; /* Hyperslab block size in each dimension */
hsize_t curr_dims[3]={13,14,15}; /* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example2.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace for dataset in the file */
/* Selection for dataspace defaults to entire space */
file_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the dataset's dataspace */
H5Sset_extent_simple(file_space,3,curr_dims,curr_dims);
/* Set the hyperslab selection for a file dataspace */
H5Sselect_hyperslab(file_space,H5S_SELECT_SET,start,stride,count,block);
/* Create the dataspace for the dataset in memory */
/* Selection for dataspace defaults to entire space */
mem_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the memory dataspace */
/* Compute the memory dimensions based on the hyperslab blocks to write */
for(i=0; i<3; i++)
curr_dims[i]=count[i]*block[i];
H5Sset_extent_simple(mem_space,3,curr_dims,curr_dims);
/* Create the dataset on disk */
dataset=H5Dcreate(file,"Dataset",H5T_NATIVE_UINT8,file_space,H5P_DEFAULT);
/* Write the hyperslab to the file */
H5Dwrite(dataset,H5T_NATIVE_UINT8,mem_space,file_space,H5P_DEFAULT,buf);
/* Close dataspaces */
H5Sclose(mem_space);
H5Sclose(file_space);
/* Close dataset & file */
H5Dclose(dataset);
H5Fclose(file);
}
Example 3: Create a simple fixed size 3-D dataspace in memory and on disk and
copy a specific selection of points (with a particular order) to
disk. The memory and file dataspaces are different sizes, but the number
of points selected are the same.
{
hid_t file; /* File ID */
hid_t dataset; /* Dataset ID */
hid_t mem_space, file_space; /* Dataspaces for memory and the file */
uint8 *buf; /* Buffer for data */
hsize_t elements[5][3]; /* Dataspace elements selected */
hsize_t curr_dims[3]={13,14,15}; /* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example3.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace for dataset in the file */
/* Selection for dataspace defaults to entire space */
file_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the dataset's dataspace */
H5Sset_extent_simple(file_space,3,curr_dims,curr_dims);
/* Set the elements for the selection in the file dataspace */
elements[0]={0,2,4}; /* Yes, I know this won't compile.. :-) */
elements[1]={3,4,1};
elements[2]={9,8,3};
elements[3]={7,2,0};
elements[4]={6,5,8};
H5Sselect_elements(file_space,H5S_SELECT_SET,5,elements);
/* Create the dataspace for the dataset in memory */
/* Selection for dataspace defaults to entire space */
mem_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the memory dataspace */
curr_dims={23,15,18}; /* This won't compile either :-) */
H5Sset_extent_simple(mem_space,3,curr_dims,curr_dims);
/* Set the elements for the selection in the file dataspace */
elements[0]={9,2,1};
elements[1]={13,1,12};
elements[2]={4,1,7};
elements[3]={0,12,0};
elements[4]={20,10,17};
H5Sselect_elements(mem_space,H5S_SELECT_SET,5,elements);
/* Create the dataset on disk */
dataset=H5Dcreate(file,"Dataset",H5T_NATIVE_UINT8,file_space,H5P_DEFAULT);
/* Write the hyperslab to the file */
H5Dwrite(dataset,H5T_NATIVE_UINT8,mem_space,file_space,H5P_DEFAULT,buf);
/* Close dataspaces */
H5Sclose(mem_space);
H5Sclose(file_space);
/* Close dataset & file */
H5Dclose(dataset);
H5Fclose(file);
}
Example 4: Create a simple fixed size 3-D dataspace in memory and on disk and
build up selection hyperslab selections to copy from memory to disk. The
selection is the same for both dataspaces, but a different offset is used,
to illustrate the selection offsets.
{
hid_t file; /* File ID */
hid_t dataset; /* Dataset ID */
hid_t mem_space, file_space; /* Dataspaces for memory and the file */
uint8 *buf; /* Buffer for data */
hsize_t start[3]; /* Start of hyperslab */
hsize_t stride[3]; /* Stride for hyperslab */
hsize_t count[3]; /* Hyperslab block count in each dimension */
hsize_t block[3]; /* Hyperslab block size in each dimension */
hssize_t offset[3]; /* Selection offset */
hsize_t curr_dims[3]={13,14,15}; /* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example4.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace for dataset in the file */
/* Selection for dataspace defaults to entire space */
file_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the dataset's dataspace */
H5Sset_extent_simple(file_space,3,curr_dims,curr_dims);
/* Build up the selection with a series of hyperslab selections */
start={0,2,4}; /* Again, this won't compile.. :-) */
stride={1,1,1};
count={6,5,8};
block={1,1,1};
/* Set the first selection, union the rest in */
H5Sselect_hyperslab(file_space,H5S_SELECT_SET,start,stride,count,block);
/* initialize the second hyperslab */
start={10,9,1}; /* Again, this won't compile.. :-) */
stride={1,1,1};
count={2,3,10};
block={1,1,1};
/* Union the second hyperslab into the file dataspace's selection */
H5Sselect_hyperslab(file_space,H5S_SELECT_UNION,start,stride,count,block);
/* initialize the third hyperslab */
start={3,10,5}; /* Again, this won't compile.. :-) */
stride={1,1,1};
count={8,2,6};
block={1,1,1};
/* Union the final hyperslab into the file dataspace's selection */
H5Sselect_hyperslab(file_space,H5S_SELECT_UNION,start,stride,count,block);
/* Create the dataspace for the dataset in memory */
/* Selection for dataspace defaults to entire space */
mem_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the memory dataspace */
curr_dims={23,15,18}; /* This won't compile either :-) */
H5Sset_extent_simple(mem_space,3,curr_dims,curr_dims);
/* Copy the selection from the file dataspace */
H5Sselect_op(mem_space,H5S_SELECT_COPY,file_space);
/* Adjust the offset of the selection in the memory dataspace */
offset={1,1,1};
H5Soffset_simple(mem_space,offset);
/* Create the dataset on disk */
dataset=H5Dcreate(file,"Dataset",H5T_NATIVE_UINT8,file_space,H5P_DEFAULT);
/* Write the hyperslab to the file */
H5Dwrite(dataset,H5T_NATIVE_UINT8,mem_space,file_space,H5P_DEFAULT,buf);
/* Close dataspaces */
H5Sclose(mem_space);
H5Sclose(file_space);
/* Close dataset & file */
H5Dclose(dataset);
H5Fclose(file);
}
Example 5: Same as example 1 (create a simple fixed size 3-D dataspace in memory and on disk and
copy the entire dataset to disk), except that the selection order is changed
for the memory dataspace, to change between FORTRAN and C array ordering.
{
hid_t file; /* File ID */
hid_t dataset; /* Dataset ID */
hid_t mem_space, file_space; /* Dataspaces for memory and the file */
uint8 *buf; /* Buffer for data */
hsize_t order[3]; /* Dimension ordering for selection */
hsize_t curr_dims[3]={3,4,5}; /* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example5.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace for dataset in the file */
/* Selection for dataspace defaults to entire space and C array order */
file_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the dataset's dataspace */
H5Sset_extent_simple(file_space,3,curr_dims,curr_dims);
/* Create the dataspace for the dataset in memory */
/* Selection for dataspace defaults to entire space and C array order */
mem_space=H5Screate(H5S_SIMPLE);
/* Set the extent & type of the memory dataspace */
H5Sset_extent_simple(mem_space,3,curr_dims,curr_dims);
/* Change selection ordering to FORTRAN order for memory dataspace */
order={0,1,2};
H5Sselect_order(mem_space,order);
/* Create the dataset on disk */
dataset=H5Dcreate(file,"Dataset",H5T_NATIVE_UINT8,file_space,H5P_DEFAULT);
/* Write the dataset to the file */
H5Dwrite(dataset,H5T_NATIVE_UINT8,mem_space,file_space,H5P_DEFAULT,buf);
/* Close dataspaces */
H5Sclose(mem_space);
H5Sclose(file_space);
/* Close dataset & file */
H5Dclose(dataset);
H5Fclose(file);
}
Example 6: Create a stored dataspace on disk and use the H5Ssubspace function
create a dataspace located within that space.
{
hid_t file; /* File ID */
hid_t space1, space2; /* Dataspace IDs */
hsize_t start[3]; /* Start of hyperslab */
hsize_t count[3]; /* Hyperslab block count in each dimension */
hsize_t curr_dims[3]={13,14,15};/* Dimensions of the dataset */
/* Create file */
file = H5Fcreate("example6.h5", H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/* Create dataspace #1 */
space1=H5Screate(H5S_SIMPLE);
/* Set the extent & type of dataspace #1 */
H5Sset_extent_simple(space1,3,curr_dims,curr_dims);
/* Store dataspace #1 on disk */
H5Scommit(file,"/Dataspaces/Dataspace #1",space1);
/* Select a contiguous hyperslab in dataspace #1 to create dataspace #2 with */
start={0,2,4};
count={6,5,8};
/*
* Use stride and block set to NULL to get contiguous, single element sized
* hyperslab. The stride and block parameters could also be set to all
* 1's, but this is simpler and easier.
*/
H5Sselect_hyperslab(space1,H5S_SELECT_SET,start,NULL,count,NULL);
/* Create dataspace #2 as a dataspace located within dataspace #1 */
space2=H5Ssubspace(space1);
/* Store dataspace #2 on disk also */
H5Scommit(file,"/Dataspaces/Dataspace #2",space2);
/*
* space1 & space2 can be used to create datasets, etc. Any datasets
* created with space2 can have their dataspace queried to find the parent
* dataspace and the location within the parent dataspace
*/
/* Close dataspaces */
H5Sclose(space1);
H5Sclose(space2);
/* Close file */
H5Fclose(file);
}
|