summaryrefslogtreecommitdiffstats
path: root/HDF5Examples/C/H5T/16/h5ex_t_enum.c
diff options
context:
space:
mode:
Diffstat (limited to 'HDF5Examples/C/H5T/16/h5ex_t_enum.c')
-rw-r--r--HDF5Examples/C/H5T/16/h5ex_t_enum.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/HDF5Examples/C/H5T/16/h5ex_t_enum.c b/HDF5Examples/C/H5T/16/h5ex_t_enum.c
new file mode 100644
index 0000000..108182b
--- /dev/null
+++ b/HDF5Examples/C/H5T/16/h5ex_t_enum.c
@@ -0,0 +1,164 @@
+/************************************************************
+
+ This example shows how to read and write enumerated
+ datatypes to a dataset. The program first writes
+ enumerated values to a dataset with a dataspace of
+ DIM0xDIM1, 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 1.6
+
+ ************************************************************/
+
+#include "hdf5.h"
+#include <stdio.h>
+#include <stdlib.h>
+
+#define FILE "h5ex_t_enum.h5"
+#define DATASET "DS1"
+#define DIM0 4
+#define DIM1 7
+#define F_BASET H5T_STD_I16BE /* File base type */
+#define M_BASET H5T_NATIVE_INT /* Memory base type */
+#define NAME_BUF_SIZE 16
+
+typedef enum { SOLID, LIQUID, GAS, PLASMA } phase_t; /* Enumerated type */
+
+int
+main(void)
+{
+ hid_t file, filetype, memtype, space, dset;
+ /* Handles */
+ herr_t status;
+ hsize_t dims[2] = {DIM0, DIM1};
+ phase_t wdata[DIM0][DIM1], /* Write buffer */
+ **rdata, /* Read buffer */
+ val;
+ char *names[4] = {"SOLID", "LIQUID", "GAS", "PLASMA"}, name[NAME_BUF_SIZE];
+ int ndims, i, j;
+
+ /*
+ * Initialize data.
+ */
+ for (i = 0; i < DIM0; i++)
+ for (j = 0; j < DIM1; j++)
+ wdata[i][j] = (phase_t)((i + 1) * j - j) % (int)(PLASMA + 1);
+
+ /*
+ * Create a new file using the default properties.
+ */
+ file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
+
+ /*
+ * Create the enumerated datatypes for file and memory. This
+ * process is simplified if native types are used for the file,
+ * as only one type must be defined.
+ */
+ filetype = H5Tenum_create(F_BASET);
+ memtype = H5Tenum_create(M_BASET);
+
+ for (i = (int)SOLID; i <= (int)PLASMA; i++) {
+ /*
+ * Insert enumerated value for memtype.
+ */
+ val = (phase_t)i;
+ status = H5Tenum_insert(memtype, names[i], &val);
+ /*
+ * Insert enumerated value for filetype. We must first convert
+ * the numerical value val to the base type of the destination.
+ */
+ status = H5Tconvert(M_BASET, F_BASET, 1, &val, NULL, H5P_DEFAULT);
+ status = H5Tenum_insert(filetype, names[i], &val);
+ }
+
+ /*
+ * Create dataspace. Setting maximum size to NULL sets the maximum
+ * size to be the current size.
+ */
+ space = H5Screate_simple(2, dims, NULL);
+
+ /*
+ * Create the dataset and write the enumerated data to it.
+ */
+ dset = H5Dcreate(file, DATASET, filetype, space, H5P_DEFAULT);
+ status = H5Dwrite(dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, wdata[0]);
+
+ /*
+ * Close and release resources.
+ */
+ status = H5Dclose(dset);
+ status = H5Sclose(space);
+ status = H5Tclose(filetype);
+ status = H5Fclose(file);
+
+ /*
+ * Now we begin the read section of this example. Here we assume
+ * the dataset has the same name and rank, but can have any size.
+ * Therefore we must allocate a new array to read in data using
+ * malloc(). For simplicity, we do not rebuild memtype.
+ */
+
+ /*
+ * Open file and dataset.
+ */
+ file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
+ dset = H5Dopen(file, DATASET);
+
+ /*
+ * Get dataspace and allocate memory for read buffer. This is a
+ * two dimensional dataset so the dynamic allocation must be done
+ * in steps.
+ */
+ space = H5Dget_space(dset);
+ ndims = H5Sget_simple_extent_dims(space, dims, NULL);
+
+ /*
+ * Allocate array of pointers to rows.
+ */
+ rdata = (phase_t **)malloc(dims[0] * sizeof(phase_t *));
+
+ /*
+ * Allocate space for enumerated data.
+ */
+ rdata[0] = (phase_t *)malloc(dims[0] * dims[1] * sizeof(phase_t));
+
+ /*
+ * Set the rest of the pointers to rows to the correct addresses.
+ */
+ for (i = 1; i < dims[0]; i++)
+ rdata[i] = rdata[0] + i * dims[1];
+
+ /*
+ * Read the data.
+ */
+ status = H5Dread(dset, memtype, H5S_ALL, H5S_ALL, H5P_DEFAULT, rdata[0]);
+
+ /*
+ * Output the data to the screen.
+ */
+ printf("%s:\n", DATASET);
+ for (i = 0; i < dims[0]; i++) {
+ printf(" [");
+ for (j = 0; j < dims[1]; j++) {
+
+ /*
+ * Get the name of the enumeration member.
+ */
+ status = H5Tenum_nameof(memtype, &rdata[i][j], name, NAME_BUF_SIZE);
+ printf(" %-6s", name);
+ }
+ printf("]\n");
+ }
+
+ /*
+ * Close and release resources.
+ */
+ free(rdata[0]);
+ free(rdata);
+ status = H5Dclose(dset);
+ status = H5Sclose(space);
+ status = H5Tclose(memtype);
+ status = H5Fclose(file);
+
+ return 0;
+}