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/************************************************************
This example shows how to commit a named datatype to a
file, and read back that datatype. The program first
defines a compound datatype, commits it to a file, then
closes the file. Next, it reopens the file, opens the
datatype, and outputs the names of its fields to the
screen.
************************************************************/
#include "hdf5.h"
#include <stdio.h>
#include <stdlib.h>
#define FILE "h5ex_t_commit.h5"
#define DATATYPE "Sensor_Type"
int
main(void)
{
hid_t file, filetype, strtype;
/* Handles */
herr_t status;
H5T_class_t typeclass;
char *name;
int nmembs, i;
/*
* Create a new file using the default properties.
*/
file = H5Fcreate(FILE, H5F_ACC_TRUNC, H5P_DEFAULT, H5P_DEFAULT);
/*
* Create variable-length string datatype.
*/
strtype = H5Tcopy(H5T_C_S1);
status = H5Tset_size(strtype, H5T_VARIABLE);
/*
* Create the compound datatype. Because the standard types we are
* using may have different sizes than the corresponding native
* types, we must manually calculate the offset of each member.
*/
filetype = H5Tcreate(H5T_COMPOUND, 8 + sizeof(char *) + 8 + 8);
status = H5Tinsert(filetype, "Serial number", 0, H5T_STD_I64BE);
status = H5Tinsert(filetype, "Location", 8, strtype);
status = H5Tinsert(filetype, "Temperature (F)", 8 + sizeof(char *), H5T_IEEE_F64BE);
status = H5Tinsert(filetype, "Pressure (inHg)", 8 + sizeof(char *) + 8, H5T_IEEE_F64BE);
/*
* Commit the compound datatype to the file, creating a named
* datatype.
*/
status = H5Tcommit(file, DATATYPE, filetype, H5P_DEFAULT, H5P_DEFAULT, H5P_DEFAULT);
/*
* Close and release resources.
*/
status = H5Tclose(filetype);
status = H5Tclose(strtype);
status = H5Fclose(file);
/*
* Now we begin the read section of this example.
*/
/*
* Open file.
*/
file = H5Fopen(FILE, H5F_ACC_RDONLY, H5P_DEFAULT);
/*
* Open the named datatype.
*/
filetype = H5Topen(file, DATATYPE, H5P_DEFAULT);
/*
* Output the data to the screen.
*/
printf("Named datatype: %s:\n", DATATYPE);
/*
* Get datatype class. If it isn't compound, we won't print
* anything.
*/
typeclass = H5Tget_class(filetype);
if (typeclass == H5T_COMPOUND) {
printf(" Class: H5T_COMPOUND\n");
nmembs = H5Tget_nmembers(filetype);
/*
* Iterate over compound datatype members.
*/
for (i = 0; i < nmembs; i++) {
/*
* Get the member name and print it. Note that
* H5Tget_member_name allocates space for the string in
* name, so we must release it after use.
*/
name = H5Tget_member_name(filetype, i);
printf(" %s\n", name);
#if H5_VERSION_GE(1, 10, 0) && !defined(H5_USE_18_API) && !defined(H5_USE_16_API)
H5free_memory(name);
#else
free(name);
#endif
}
}
/*
* Close and release resources.
*/
status = H5Tclose(filetype);
status = H5Fclose(file);
return 0;
}
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