Merge examples and workflows from develop (#3918)

1 files changed, 138 insertions, 0 deletions

diff --git a/HDF5Examples/C/H5T/h5ex_t_vlstringatt.c b/HDF5Examples/C/H5T/h5ex_t_vlstringatt.c
new file mode 100644
index 0000000..443c0a2
--- /dev/null
+++ b/HDF5Examples/C/H5T/h5ex_t_vlstringatt.c
@@ -0,0 +1,138 @@
+/************************************************************
+
+  This example shows how to read and write variable-length
+  string datatypes to an attribute.  The program first
+  writes variable-length strings to an attribute with a
+  dataspace of DIM0, then closes the file.  Next, it reopens
+  the file, reads back the data, and outputs it to the
+  screen.
+
+  This file is intended for use with HDF5 Library version 1.8
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE      "h5ex_t_vlstringatt.h5"
+#define DATASET   "DS1"
+#define ATTRIBUTE "A1"
+#define DIM0      4
+
+int
+main(void)
+{
+    hid_t file, filetype, memtype, space, dset, attr;
+    /* Handles */
+    herr_t  status;
+    hsize_t dims[1]     = {DIM0};
+    char   *wdata[DIM0] = {"Parting", "is such", "sweet", "sorrow."},
+         /* Write buffer */
+        **rdata; /* Read buffer */
+    int ndims, i;
+
+    /*
+     * Create a new file using the default properties.
+     */
+    file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+    /*
+     * Create file and memory datatypes.  For this example we will save
+     * the strings as FORTRAN strings.
+     */
+    filetype = H5Tcopy(H5T_FORTRAN_S1);
+    status   = H5Tset_size(filetype, H5T_VARIABLE);
+    memtype  = H5Tcopy(H5T_C_S1);
+    status   = H5Tset_size(memtype, H5T_VARIABLE);
+
+    /*
+     * Create dataset with a null dataspace.
+     */
+    space  = H5Screate(H5S_NULL);
+    dset   = H5Dcreate(file, DATASET, H5T_STD_I32LE, space, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
+    status = H5Sclose(space);
+
+    /*
+     * Create dataspace.  Setting maximum size to NULL sets the maximum
+     * size to be the current size.
+     */
+    space = H5Screate_simple(1, dims, NULL);
+
+    /*
+     * Create the attribute and write the variable-length string data
+     * to it.
+     */
+    attr   = H5Acreate(dset, ATTRIBUTE, filetype, space, H5P_DEFAULT, H5P_DEFAULT);
+    status = H5Awrite(attr, memtype, wdata);
+
+    /*
+     * Close and release resources.
+     */
+    status = H5Aclose(attr);
+    status = H5Dclose(dset);
+    status = H5Sclose(space);
+    status = H5Tclose(filetype);
+    status = H5Tclose(memtype);
+    status = H5Fclose(file);
+
+    /*
+     * Now we begin the read section of this example.  Here we assume
+     * the attribute has the same name and rank, but can have any size.
+     * Therefore we must allocate a new array to read in data using
+     * malloc().
+     */
+
+    /*
+     * Open file, dataset, and attribute.
+     */
+    file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+    dset = H5Dopen(file, DATASET, H5P_DEFAULT);
+    attr = H5Aopen(dset, ATTRIBUTE, H5P_DEFAULT);
+
+    /*
+     * Get the datatype.
+     */
+    filetype = H5Aget_type(attr);
+
+    /*
+     * Get dataspace and allocate memory for read buffer.
+     */
+    space = H5Aget_space(attr);
+    ndims = H5Sget_simple_extent_dims(space, dims, NULL);
+    rdata = (char **)malloc(dims[0] * sizeof(char *));
+
+    /*
+     * Create the memory datatype.
+     */
+    memtype = H5Tcopy(H5T_C_S1);
+    status  = H5Tset_size(memtype, H5T_VARIABLE);
+
+    /*
+     * Read the data.
+     */
+    status = H5Aread(attr, memtype, rdata);
+
+    /*
+     * Output the data to the screen.
+     */
+    for (i = 0; i < dims[0]; i++)
+        printf("%s[%d]: %s\n", ATTRIBUTE, i, rdata[i]);
+
+    /*
+     * Close and release resources.  Note that H5Dvlen_reclaim works
+     * for variable-length strings as well as variable-length arrays.
+     * Also note that we must still free the array of pointers stored
+     * in rdata, as H5Tvlen_reclaim only frees the data these point to.
+     */
+    status = H5Dvlen_reclaim(memtype, space, H5P_DEFAULT, rdata);
+    free(rdata);
+    status = H5Aclose(attr);
+    status = H5Dclose(dset);
+    status = H5Sclose(space);
+    status = H5Tclose(filetype);
+    status = H5Tclose(memtype);
+    status = H5Fclose(file);
+
+    return 0;
+}