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| HDF5 Last Updated on 2026-07-28 The HDF5 Field Guide

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h5a Module Reference
Fortran Attribute (H5A) Interface

This module contains Fortran interfaces for H5A functions. More...

## Functions/Subroutines
subroutine | h5aclose_async_f (attr_id, es_id, hdferr, file, func, line)
| Asynchronously closes the specified attribute.
subroutine | h5aclose_f (attr_id, hdferr)
| Closes the specified attribute.
subroutine | h5acreate_async_f (loc_id, name, type_id, space_id, attr_id, es_id, hdferr, acpl_id, aapl_id, file, func, line)
| Asynchronously creates a dataset as an attribute of a group, dataset, or named datatype.
subroutine | h5acreate_by_name_async_f (loc_id, obj_name, attr_name, type_id, space_id, attr, es_id, hdferr, acpl_id, aapl_id, lapl_id, file, func, line)
| Asynchronously creates an attribute attached to a specified object.
subroutine | h5acreate_by_name_f (loc_id, obj_name, attr_name, type_id, space_id, attr, hdferr, acpl_id, aapl_id, lapl_id)
| Creates an attribute attached to a specified object.
subroutine | h5acreate_f (loc_id, name, type_id, space_id, attr_id, hdferr, acpl_id, aapl_id)
| Creates a dataset as an attribute of a group, dataset, or named datatype.
subroutine | h5adelete_by_idx_f (loc_id, obj_name, idx_type, order, n, hdferr, lapl_id)
| Deletes an attribute from an object according to index order.
subroutine | h5adelete_by_name_f (loc_id, obj_name, attr_name, hdferr, lapl_id)
| Removes an attribute from a specified location.
subroutine | h5adelete_f (obj_id, name, hdferr)
| Deletes an attribute of an object (group, dataset or named datatype).
subroutine | h5aexists_async_f (obj_id, attr_name, attr_exists, es_id, hdferr, file, func, line)
| Asynchronously determines whether an attribute with a given name exists on an object.
subroutine | h5aexists_by_name_async_f (loc_id, obj_name, attr_name, attr_exists, es_id, hdferr, lapl_id, file, func, line)
| Asynchronously determines whether an attribute with a given name exists on an object.
subroutine | h5aexists_by_name_f (loc_id, obj_name, attr_name, attr_exists, hdferr, lapl_id)
| Determines whether an attribute with a given name exists on an object.
subroutine | h5aexists_f (obj_id, attr_name, attr_exists, hdferr)
| Determines whether an attribute with a given name exists on an object.
subroutine | h5aget_create_plist_f (attr_id, creation_prop_id, hdferr)
| Gets an attribute creation property list identifier.
subroutine | h5aget_info_by_idx_f (loc_id, obj_name, idx_type, order, n, f_corder_valid, corder, cset, data_size, hdferr, lapl_id)
| Retrieves attribute information by attribute index position.
subroutine | h5aget_info_by_name_f (loc_id, obj_name, attr_name, f_corder_valid, corder, cset, data_size, hdferr, lapl_id)
| Retrieves attribute information, by attribute name.
subroutine | h5aget_info_f (attr_id, f_corder_valid, corder, cset, data_size, hdferr)
| Retrieves attribute information, by attribute identifier.
subroutine | h5aget_name_by_idx_f (loc_id, obj_name, idx_type, order, n, name, hdferr, size, lapl_id)
| Gets an attribute name, by attribute index position.
subroutine | h5aget_name_f (attr_id, size, buf, hdferr)
| Gets an attribute name.
subroutine | h5aget_num_attrs_f (obj_id, attr_num, hdferr)
| Determines the number of attributes attached to an object.
subroutine | h5aget_space_f (attr_id, space_id, hdferr)
| Gets a copy of the dataspace for an attribute.
subroutine | h5aget_storage_size_f (attr_id, size, hdferr)
| Returns the amount of storage required for an attribute.
subroutine | h5aget_type_f (attr_id, type_id, hdferr)
| Gets an attribute datatype.
subroutine | h5aopen_async_f (obj_id, attr_name, attr_id, es_id, hdferr, aapl_id, file, func, line)
| Asynchronously opens an attribute for an object specified by object identifier and attribute name.
subroutine | h5aopen_by_idx_async_f (loc_id, obj_name, idx_type, order, n, attr_id, es_id, hdferr, aapl_id, lapl_id, file, func, line)
| Asynchronously opens an existing attribute that is attached to an object specified by location and name.
subroutine | h5aopen_by_idx_f (loc_id, obj_name, idx_type, order, n, attr_id, hdferr, aapl_id, lapl_id)
| Opens an existing attribute that is attached to an object specified by location and name.
subroutine | h5aopen_by_name_async_f (loc_id, obj_name, attr_name, attr_id, es_id, hdferr, aapl_id, lapl_id, file, func, line)
| Asynchronously opens an attribute for an object by object name and attribute name.
subroutine | h5aopen_by_name_f (loc_id, obj_name, attr_name, attr_id, hdferr, aapl_id, lapl_id)
| Opens an attribute for an object by object name and attribute name.
subroutine | h5aopen_f (obj_id, attr_name, attr_id, hdferr, aapl_id)
| Opens an attribute for an object specified by object identifier and attribute name.
subroutine | h5aopen_idx_f (obj_id, index, attr_id, hdferr)
| Opens the attribute specified by its index.
subroutine | h5aopen_name_f (obj_id, name, attr_id, hdferr)
| Opens an attribute specified by name.
subroutine | h5aread_async_f (attr_id, memtype_id, buf, es_id, hdferr, file, func, line)
| Asynchronously reads an attribute.
subroutine | h5aread_f (attr_id, memtype_id, buf, dims, hdferr)
| Reads an attribute.
subroutine | h5aread_f (attr_id, memtype_id, buf, hdferr)
| Reads an attribute.
subroutine | h5arename_async_f (loc_id, old_attr_name, new_attr_name, es_id, hdferr, file, func, line)
| Asynchronously renames an attribute.
subroutine | h5arename_by_name_async_f (loc_id, obj_name, old_attr_name, new_attr_name, es_id, hdferr, lapl_id, file, func, line)
| Asynchronously renames an attribute.
subroutine | h5arename_by_name_f (loc_id, obj_name, old_attr_name, new_attr_name, hdferr, lapl_id)
| Renames an attribute.
subroutine | h5arename_f (loc_id, old_attr_name, new_attr_name, hdferr)
| Renames an attribute.
subroutine | h5awrite_async_f (attr_id, memtype_id, buf, es_id, hdferr, file, func, line)
| Asynchronously writes an attribute.
subroutine | h5awrite_f (attr_id, memtype_id, buf, dims, hdferr)
| Writes data to an attribute.
subroutine | h5awrite_f (attr_id, memtype_id, buf, hdferr)
| Writes data to an attribute.

## Detailed Description

This module contains Fortran interfaces for H5A functions.