[svn-r13702] Added new example that uses H5Gcreate2 and H5Lexists calls

Platforms tested: Linux 2.6 RedHat in Chicago; no access to other machines

1 files changed, 113 insertions, 0 deletions

diff --git a/examples/h5_interm_group.c b/examples/h5_interm_group.c
new file mode 100644
index 0000000..7889abf
--- /dev/null
+++ b/examples/h5_interm_group.c
@@ -0,0 +1,113 @@
+/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
+ * 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 checks if group exists in a file and creates it including
+ * all intermediate groups.
+ */
+
+
+#include "hdf5.h"
+
+
+#define H5FILE_NAME    "interm_group.h5"
+#define TRUE            1
+#define FALSE           0
+
+int
+main(void)
+{
+
+    hid_t    file;
+    hid_t    g1_id, g2_id, g3_id;
+    hid_t    grp_crt_plist;
+    H5G_info_t g2_info;
+    char     name[3];
+
+    herr_t   status;
+    int      i;
+
+
+    /*
+     * Create a file using the default properties.
+     */
+    file = H5Fcreate(H5FILE_NAME, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /*
+     * Create a group in the file.
+     */
+    g1_id = H5Gcreate(file, "/G1", 0);
+
+    H5Gclose(g1_id);
+    H5Fclose(file);
+
+    /*
+     * Now reopen the file and group in the file.
+     */
+    file = H5Fopen(H5FILE_NAME, H5F_ACC_RDWR, H5P_DEFAULT);
+
+    /*
+     * Check if group /G1 exists in the file.
+     */
+    if(H5Lexists(file, "/G1", H5P_DEFAULT) !=FALSE) 
+    printf("Group /G1 exists in the file\n");
+    
+    /*
+     * Check that group G2/G3 exists in /G1 and if not create it using 
+     * intermediate group creation property.
+     */
+    g1_id = H5Gopen(file, "/G1");
+/* Next commented call causes error stack to be printed out; the next one
+ * works fine; is it a bug or a feature? EIP 04-25-07 
+*/
+/*  if (H5Lexists(g1_id, "G2/G3", H5P_DEFAULT) !=TRUE) { */ 
+    if (H5Lexists(g1_id, "G2", H5P_DEFAULT) !=TRUE) {  
+       
+    grp_crt_plist = H5Pcreate(H5P_LINK_CREATE);
+
+    /* Set flag for intermediate group creation */
+    status = H5Pset_create_intermediate_group(grp_crt_plist, TRUE);
+    g3_id = H5Gcreate2(g1_id, "G2/G3", grp_crt_plist, H5P_DEFAULT, H5P_DEFAULT);
+    H5Gclose(g3_id);
+    } 
+    H5Gclose(g1_id);
+
+
+    /* Now check if group /G1/G2 exists in the file, then open it and print
+     * its members names
+     */
+    if (H5Lexists(file, "/G1/G2", H5P_DEFAULT)) { 
+
+    	g2_id = H5Gopen(file, "/G1/G2");
+    	status = H5Gget_info(g2_id, ".", &g2_info, H5P_DEFAULT);
+    	printf("Group /G1/G2 has %d member(s)\n", (int)g2_info.nlinks);
+
+    	for (i=0; i < (int)g2_info.nlinks; i++) {
+    	H5Lget_name_by_idx(g2_id, ".", H5_INDEX_NAME, H5_ITER_NATIVE, (hsize_t)i, 
+    	                   name, 3, H5P_DEFAULT);
+    	printf("Object's name is %s\n", name);
+
+    	}
+    H5Gclose(g2_id);
+    } 
+    H5Fclose(file);
+    return 0;
+}
+
+
+
+
+
+