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authorQuincey Koziol <koziol@koziol.gov>2020-06-26 23:57:38 (GMT)
committerQuincey Koziol <koziol@koziol.gov>2020-06-26 23:57:38 (GMT)
commite767f44e953047297fece364218147c908e8b585 (patch)
treed4b6909f14b78bb732b6947adc46ac3cd3ca54f6 /examples/h5_reference_deprec.c
parent949649a2b6e00297cbdc49437e70a27e455e92d2 (diff)
parenta08ab621febde7b09e4d86eab80cb029c123e9f6 (diff)
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Merge remote-tracking branch 'origin/develop' into monotonic_timer
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+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * Copyright by The HDF Group. *
+ * Copyright by the Board of Trustees of the University of Illinois. *
+ * All rights reserved. *
+ * *
+ * This file is part of HDF5. The full HDF5 copyright notice, including *
+ * terms governing use, modification, and redistribution, is contained in *
+ * the COPYING file, which can be found at the root of the source code *
+ * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases. *
+ * If you do not have access to either file, you may request a copy from *
+ * help@hdfgroup.org. *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+
+ /*
+ * This program illustrates how references to objects can be used.
+ * Program creates a dataset and a group in a file. It also creates
+ * second dataset, and references to the first dataset and the group
+ * are stored in it.
+ * Program reopens the file and reads dataset with the references.
+ * References are used to open the objects. Information about the
+ * objects is displayed.
+ */
+
+#include <stdlib.h>
+
+#include "hdf5.h"
+
+#define H5FILE_NAME "refere.h5"
+
+int
+main(void) {
+ hid_t fid; /* File, group, datasets, datatypes */
+ hid_t gid_a; /* and dataspaces identifiers */
+ hid_t did_b, sid_b, tid_b;
+ hid_t did_r, tid_r, sid_r;
+ H5O_type_t obj_type;
+ herr_t status;
+
+ hobj_ref_t *wbuf; /* buffer to write to disk */
+ hobj_ref_t *rbuf; /* buffer to read from disk */
+
+
+ hsize_t dim_r[1];
+ hsize_t dim_b[2];
+
+ /*
+ * Create a file using default properties.
+ */
+ fid = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Create group "A" in the file.
+ */
+ gid_a = H5Gcreate2(fid, "A", H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Create dataset "B" in the file.
+ */
+ dim_b[0] = 2;
+ dim_b[1] = 6;
+ sid_b = H5Screate_simple(2, dim_b, NULL);
+ did_b = H5Dcreate2(fid, "B", H5T_NATIVE_FLOAT, sid_b, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Create dataset "R" to store references to the objects "A" and "B".
+ */
+ dim_r[0] = 2;
+ sid_r = H5Screate_simple(1, dim_r, NULL);
+ tid_r = H5Tcopy(H5T_STD_REF_OBJ);
+ did_r = H5Dcreate2(fid, "R", tid_r, sid_r, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Allocate write and read buffers.
+ */
+ wbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2);
+ rbuf = (hobj_ref_t *)malloc(sizeof(hobj_ref_t) * 2);
+
+ /*
+ * Create references to the group "A" and dataset "B"
+ * and store them in the wbuf.
+ */
+ H5Rcreate(&wbuf[0], fid, "A", H5R_OBJECT, (hid_t)-1);
+ H5Rcreate(&wbuf[1], fid, "B", H5R_OBJECT, (hid_t)-1);
+
+ /*
+ * Write dataset R using default transfer properties.
+ */
+ status = H5Dwrite(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, wbuf);
+
+ /*
+ * Close all objects.
+ */
+ H5Gclose(gid_a);
+
+ H5Sclose(sid_b);
+ H5Dclose(did_b);
+
+ H5Tclose(tid_r);
+ H5Sclose(sid_r);
+ H5Dclose(did_r);
+
+ H5Fclose(fid);
+
+ /*
+ * Reopen the file.
+ */
+ fid = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT);
+
+ /*
+ * Open and read dataset "R".
+ */
+ did_r = H5Dopen2(fid, "R", H5P_DEFAULT);
+ status = H5Dread(did_r, H5T_STD_REF_OBJ, H5S_ALL, H5S_ALL, H5P_DEFAULT, rbuf);
+
+ /*
+ * Find the type of referenced objects.
+ */
+ status = H5Rget_obj_type2(did_r, H5R_OBJECT, &rbuf[0], &obj_type);
+ if(obj_type == H5O_TYPE_GROUP)
+ printf("First dereferenced object is a group. \n");
+
+ status = H5Rget_obj_type2(did_r, H5R_OBJECT, &rbuf[1], &obj_type);
+ if(obj_type == H5O_TYPE_DATASET)
+ printf("Second dereferenced object is a dataset. \n");
+
+ /*
+ * Get datatype of the dataset "B"
+ */
+ did_b = H5Rdereference2(did_r, H5P_DEFAULT, H5R_OBJECT, &rbuf[1]);
+ tid_b = H5Dget_type(did_b);
+ if(H5Tequal(tid_b, H5T_NATIVE_FLOAT))
+ printf("Datatype of the dataset is H5T_NATIVE_FLOAT.\n");
+ printf("\n");
+
+ /*
+ * Close all objects and free memory buffers.
+ */
+ H5Dclose(did_r);
+ H5Dclose(did_b);
+ H5Tclose(tid_b);
+ H5Fclose(fid);
+ free(rbuf);
+ free(wbuf);
+
+ return 0;
+ }
+