Last modified: 14 October 2014
Name: H5Topen
Signature:
  hid_t `H5Topen`( hid_t `loc_id`, const char * `name` )

  hid_t `H5Topen`( hid_t `loc_id`, const char * `name`, hid_t `tapl_id` )

Purpose:
  Opens a committed (named) datatype.

Description:
  `H5Topen` is a macro that is mapped to either `H5Topen1` or `H5Topen2`, depending on the needs of the application.

  Such macros are provided to facilitate application compatibility. Their use and mappings are fully described in “API Compatibility Macros in HDF5”; we urge you to read that document closely.

  When both the HDF5 Library and the application are built and installed with no specific compatibility flags, `H5Topen` is mapped to the most recent version of the function, currently `H5Topen2`. If the library and/or application is compiled for Release 1.6 emulation, `H5Topen` will be mapped to `H5Topen1`. 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 setting | `H5Topen` mapping
  --- | ---
  Global settings
  No compatibility flag | `H5Topen2`
  Enable deprecated symbols | `H5Topen2`
  Disable deprecated symbols | `H5Topen2`
  Emulate Release 1.6 interface`` | `H5Topen1`
  Function-level macros
  `H5Topen_vers = 2` | `H5Topen2`
  `H5Topen_vers = 1` | `H5Topen1`

  The datatype identifier returned by this macro can be released with `H5Tclose` when the identifier is no longer needed so that resource leaks will not develop.

Fortran90 Interface: h5topen_f

      SUBROUTINE h5topen_f(loc_id, name, type_id, hdferr, tapl_id)
        IMPLICIT NONE
        INTEGER(HID_T), INTENT(IN) :: loc_id   ! File or group identifier
        CHARACTER(LEN=*), INTENT(IN) :: name   ! Datatype name within file or group
        INTEGER(HID_T), INTENT(OUT) :: type_id ! Datatype identifier
        INTEGER, INTENT(OUT) :: hdferr         ! Error code
                                               ! 0 on success and -1 on failure
        INTEGER(HID_T), OPTIONAL, INTENT(IN) :: tapl_id
                                               ! Datatype access property list id
      END SUBROUTINE h5topen_f

See Also:
  “Using Identifiers”
History:

  Release | C
  1.8.0 | The function `H5Topen` renamed to `H5Topen1` and deprecated in this release. The macro `H5Topen` and the function `H5Topen2` introduced in this release.