[svn-r17065] This example creates a file and writes a two dimensional real dataset

    to it.

    It then reopens the file and reads a region of data given a set
    of corner coordinates.
    Main illustrative function: H5LTread_region

1 files changed, 109 insertions, 0 deletions

diff --git a/hl/examples/ex_lite_read_region.c b/hl/examples/ex_lite_read_region.c
new file mode 100644
index 0000000..3628e49
--- /dev/null
+++ b/hl/examples/ex_lite_read_region.c
@@ -0,0 +1,109 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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 example creates a file and writes a two dimensional real dataset
+    to it.
+
+    It then reopens the file and reads a region of data given a set
+    of corner coordinates.
+    Main illustrative function: H5LTread_region
+*/
+
+#include "hdf5.h"
+#include "hdf5_hl.h"
+
+#define filename "File.h5"
+#define DSETNAME "DS"     /* dataset name */
+
+#define DIM0  5   /* dataset dimensions */
+#define DIM1  4
+
+#define RANK  2  /* dataset RANK */
+
+
+int main(void)
+{
+    hid_t file_id;         /* file identifier */
+    hsize_t dims[RANK] =  {DIM0, DIM1};
+    herr_t status;
+    float data[DIM0][DIM1];
+    int i, j;
+    hsize_t block_coord[4] ={ 2, 2, 4, 3};
+    float rdata[3][2];
+    
+
+/*********************************************************  
+   This writes data to the HDF5 file.  
+ *********************************************************/ 
+ 
+    /* 
+     * Data initialization. 
+     */
+    printf("FULL 2D ARRAY:");
+    for (i=0; i<DIM0; i++) {
+      printf("\n[ ");
+      for (j=0; j<DIM1; j++) {
+	data[i][j] =  (float)((DIM0-1)*i+j);
+	printf("%f ", data[i][j]);
+      }
+      printf("]");
+    }
+    printf("\n");
+
+    /*
+     * Create file with default file access and file creation properties.
+     */
+    file_id = H5Fcreate(filename, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /*
+     * Create and write the dataset.
+     */
+    status = H5LTmake_dataset ( file_id, DSETNAME, 2, dims, H5T_NATIVE_FLOAT, data);
+    
+    status = H5Fclose(file_id);
+
+/*************************************************************  
+
+  This reads a region of data given corner coordinates
+
+ ************************************************************/  
+
+    status = H5LTread_region(filename,
+			     "/DS",
+	                     block_coord,
+ 			     H5T_NATIVE_FLOAT,
+ 			     rdata);
+    
+    printf("REGION 2D HYPERSLAB BY CORNER COORDINATES ,");
+    printf(" COORDINATES (%d,%d)-(%d,%d):\n",(int)block_coord[0],(int)block_coord[1],
+	   (int)block_coord[2],(int)block_coord[3]);
+    
+
+    for (i=0; i< block_coord[2] - block_coord[0] + 1; i++)
+      {
+	printf("\n  [ ");
+	for (j=0; j< block_coord[3] - block_coord[1] + 1; j++) {
+	  printf("%f ", rdata[i][j]);
+	}
+	printf("]");
+      }
+    printf("\n");
+    
+    return 0;
+}
+
+
+