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Hdf rm anchor
AnchorNamesummary

Excerpt

Determines whether an attribute with a given name exists on an object

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Hdf rm anchor
AnchorNameprocedure

Procedure:
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H5A_EXISTS_BY_NAME(loc_id, obj_name, attr_name, lapl_id)

Hdf rm anchor
AnchorNamesignature

Signature:
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<pre><code class="language-c">htri_t H5Aexists_by_name
(
    hid_t       loc_id,
    const char *obj_name,
    const char *attr_name,
    hid_t       lapl_id
)</code></pre>
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<pre><code class="language-fortran">SUBROUTINE h5aexists_by_name_f(loc_id, obj_name, attr_name, attr_exists, hdferr,&
     lapl_id)
  IMPLICIT NONE
  INTEGER(HID_T), INTENT(IN) :: loc_id  ! Location identifier
  CHARACTER(LEN=*), INTENT(IN) :: obj_name 
                                        ! Object name either relative to loc_id, 
                                        ! absolute from the 
                                        ! file’s root group, or '.'
  CHARACTER(LEN=*), INTENT(IN) :: attr_name 
                                        ! Attribute name
  LOGICAL, INTENT(OUT) :: attr_exists   ! .TRUE. if exists, .FALSE. otherwise
  INTEGER, INTENT(OUT) :: hdferr        ! Error code:
                                        ! 0 on success and -1 on failure
  INTEGER(HID_T), OPTIONAL, INTENT(IN) :: lapl_id 
                                        ! Link access property list identifier
END SUBROUTINE h5aexists_by_name_f</code></pre>

Hdf rm anchor
AnchorNameparameters

Parameters:
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hid_t loc_idIN: Location identifier; may be a file, group, dataset, or named datatype
const char * obj_nameIN: Object name 
Either relative to loc_id, absolute from the file’s root group, or '.' (a dot)
const char * attr_name    IN: Attribute name
hid_t lapl_idIN: Link access property list identifier

Hdf rm anchor
AnchorNamedescription

Description:
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H5A_EXISTS_BY_NAME  determines whether the attribute  attr_name  exists on an object. That object is specified by its location and name,  loc_id  and  obj_name , respectively.

loc_id specifies a location in the file containing the object. obj_name is the name of the object to which the attribute is attached and can be a relative name, relative to loc_id, or an absolute name, based in the root group of the file. If loc_id fully specifies the object, obj_name should be '.' (a dot).

The link access property list, lapl_id, may provide information regarding the properties of links required to access obj_name. See “Link Access Properties” in the H5P APIs.

Hdf rm anchor
AnchorNamereturns

Returns:
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Returns a positive value if  attr_name  exists. 
Returns 0 if  attr_name  does not exist. 
Returns a negative value when the function fails.

Hdf rm anchor
AnchorNameexample

Example:
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Comment
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Bitbucket Server file
repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathexamples/h5_subset.c
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progLangcpp
lineEnd42
applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

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Bitbucket Server file
repoSlughdf5
branchIdrefs/heads/1.10/master
projectKeyHDFFV
filepathfortran/examples/compound.f90
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progLangplain
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applicationLink5ac7b370-7412-3c8c-ad20-807a68261336

Hdf rm anchor
AnchorNamehistory

History:
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C
Release    Change
1.8.0Function introduced in this release.