[svn-r17069] This program shows how to create a dataset and region references associated

  with hyperslabs. It then creates a new dataset composed of data from the
  data associated with a recursive loop over all the region references.
  Main illustrative function: H5LRcreate_regref_to_all

1 files changed, 133 insertions, 0 deletions

diff --git a/hl/examples/ex_regref_to_all.c b/hl/examples/ex_regref_to_all.c
new file mode 100644
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+++ b/hl/examples/ex_regref_to_all.c
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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 files COPYING and Copyright.html.  COPYING can be found at the root   *
+ * of the source code distribution tree; Copyright.html can be found at the  *
+ * root level of an installed copy of the electronic HDF5 document set and   *
+ * is linked from the top-level documents page.  It can also be found at     *
+ * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
+ * access to either file, you may request a copy from help@hdfgroup.org.     *
+ * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
+/*
+  This program shows how to create a dataset and region references associated
+  with hyperslabs. It then creates a new dataset composed of data from the 
+  data associated with a recursive loop over all the region references. 
+  Main illustrative function: H5LRcreate_regref_to_all
+*/
+
+#include "hdf5.h"
+#include "hdf5_hl.h"
+
+#define filename "File.h5"
+#define dsetnamev "MY_DATA" /* dataset name */
+#define dsetnamer "MY_REF" /* region references name */
+
+#define DIM0  9   /* dataset dimensions */
+#define DIM1  8
+#define RANK  2   /* dataset rank */
+
+
+int main(void)
+{
+  hid_t file_id;        /* file identifier */
+  hid_t space_id_ref;   /* region reference dataspace identifier */
+  hid_t dset_id_ref;    /* region reference dataset identifiers*/
+  hsize_t dims[RANK] =  {DIM0,DIM1}; /* dataset dimensions */
+  hsize_t dims_ref[1] = {2}; /* region reference dimensions */
+  herr_t status;
+  hdset_reg_ref_t ref[2]; /* region references */
+  int data[DIM0][DIM1];   /* data */
+  int i, j;
+  const char *path[2];    /* paths to the data for the region references */
+  hsize_t block_coord[8] ={ 0, 0, 2, 2, 3, 3, 5, 5}; /* hyperslab coordinates defining region references */
+  int rdata[18]; /* holds data from region references */
+  
+  /*********************************************************  
+   This section writes data to the HDF5 file.  
+  *********************************************************/ 
+  
+  path[0] ="/MY_DATA";
+  path[1] ="/MY_DATA";
+  /* 
+   * Data initialization. 
+   */
+  printf("FULL 2D DATA:");
+  for (i=0; i<DIM0; i++) {
+    printf("\n[ ");
+    for (j=0; j<DIM1; j++) {
+      data[i][j] =  10*i+j;
+      printf("%02d ", data[i][j]);
+    }
+    printf("]");
+  }
+  printf("\n");
+
+  /* Open the file. */
+  
+  file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+  /*
+   * Create and write the dataset.
+   */
+  status = H5LTmake_dataset ( file_id, dsetnamev, RANK, dims, H5T_NATIVE_INT, data);
+  
+  /*
+   * Create two region references with hyperslab coordinates: (0,0)-(2,2) and (3,3)-(5,5).
+   */
+  status = H5LRcreate_region_references(file_id, 2, path, block_coord, ref);
+  
+  /*
+   * Write the region references to the file
+   */
+  space_id_ref = H5Screate_simple(1, dims_ref, NULL);
+  dset_id_ref = H5Dcreate2(file_id, dsetnamer, H5T_STD_REF_DSETREG, space_id_ref, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+  status = H5Dwrite(dset_id_ref, H5T_STD_REF_DSETREG, H5S_ALL, H5S_ALL, H5P_DEFAULT,ref);
+  
+  /*
+   * Close all objects.
+   */
+  status = H5Sclose(space_id_ref);
+  status = H5Dclose(dset_id_ref);
+  status = H5Fclose(file_id);
+  
+/*************************************************************  
+
+  This section creates a data set from region references found
+  recursively in the file starting at "/" for this example.
+
+************************************************************/  
+  
+  /*
+   * Reopen the file.
+   */
+  file_id = H5Fopen(filename, H5F_ACC_RDWR,  H5P_DEFAULT);
+  
+  /*
+   * Create the "/MY_DATAc" dataset from regions of data.
+   */
+  
+  status = H5LRcreate_regref_to_all(file_id, "/",
+				    "/NEW_DATA", H5_INDEX_NAME, H5_ITER_INC);
+  
+  /*
+   * Read the newly created data set and print it.
+   */
+  
+  status = H5LTread_dataset(file_id,"/NEW_DATA",H5T_NATIVE_INT,rdata);
+  
+  printf(" DATA FROM RECURSIVELY ALL THE REGION REFERENCES STARTING AT TOP LEVEL / :\n");
+  printf("[ ");
+  for (i=0; i<18; i++) {
+    printf("%02d ", rdata[i]);
+  }
+  printf("] \n");
+  
+  return 0;
+}
+
+
+