Page tree









Creates an attribute attached to a specified object


hid_t H5Acreate( hid_t loc_id, const char *attr_name, hid_t type_id, hid_t space_id, hid_t acpl_id )

hid_t H5Acreate( hid_t loc_id, const char *attr_name, hid_t type_id, hid_t space_id, hid_t acpl_id, hid_t aapl_id )

SUBROUTINE h5acreate_f(loc_id, name, type_id, space_id, attr_id, hdferr, &
                       acpl_id, aapl_id )
  INTEGER(HID_T), INTENT(IN) :: loc_id    ! Object identifier 
  CHARACTER(LEN=*), INTENT(IN) :: name    ! Attribute name
  INTEGER(HID_T), INTENT(IN) :: type_id   ! Attribute datatype identifier    
  INTEGER(HID_T), INTENT(IN) :: space_id  ! Attribute dataspace identifier
  INTEGER(HID_T), INTENT(OUT) :: attr_id  ! Attribute identifier 
  INTEGER, INTENT(OUT) :: hdferr          ! Error code:
                                          ! 0 on success and -1 on failure
                                          ! Attribute creation property 
                                          ! list identifier
                                          ! Attribute access property 
                                          ! list identifier
END SUBROUTINE h5acreate_f


H5A_CREATE is a macro that is mapped to either H5A_CREATE1 or H5A_CREATE2, depending on the needs of the application.

Such macros are provided to facilitate application compatibility. For example:

  • The H5A_CREATE macro will be mapped to H5A_CREATE1 and will use the H5A_CREATE1 syntax (first signature above) if an application is coded for HDF5 Release 1.6.x.
  • The H5A_CREATE macro will be mapped to H5A_CREATE2 and will use the H5A_CREATE2 syntax (second signature above) if an application is coded for HDF5 Release 1.8.x.

See API Compatibility Macros in HDF5 for information on these macros and mappings.

When both the HDF5 library and the application are built and installed with no specific compatibility flags, H5A_CREATE is mapped to the most recent version of the function, currently H5A_CREATE2. If the library and/or application is compiled for Release 1.6 emulation, H5A_CREATE will be mapped to H5A_CREATE1. Function-specific flags are available to override these settings on a function-by-function basis when the application is compiled.

Specific compile-time compatibility flags and the resulting mappings are as follows:

Compatibility settingH5A_CREATE mapping

Global settings
No compatibility flagH5A_CREATE2 
Enable deprecated symbolsH5A_CREATE2 
Disable deprecated symbolsH5A_CREATE2 
Emulate Release 1.6 interface    H5A_CREATE1 

Function-level macros
H5Acreate_vers = 2H5A_CREATE2
H5Acreate_vers = 1H5A_CREATE1


The attribute identifier returned by this macro must be released with H5A_CLOSE or resource leaks will develop.

Interface history:   Signature [1] above is the original H5A_CREATE interface and the only interface available prior to HDF5 Release 1.8.0. This signature and the corresponding function are now deprecated but will remain directly callable as H5A_CREATE1.

Signature [2] above was introduced with HDF5 Release 1.8.0 and is the recommended and default interface. It is directly callable as H5A_CREATE2.

See API Compatibility Macros in HDF5 for circumstances under which either of these functions might not be available in an installed instance of the HDF5 Library.

Release    C
1.8.0The function H5Acreate renamed to H5Acreate1 and deprecated in this release.
The macro H5Acreate and the functions H5Acreate2 and H5Acreate_by_name introduced in this release.

--- Last Modified: March 02, 2018 | 02:41 PM