H5A_WRITE

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Page Title

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Excerpt
Writes data to an attribute

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Procedure:

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H5A_WRITE(attr_id, mem_type_id, buf)

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Signature:

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<pre><code class="language-c">herr_t H5Awrite ( hid_t attr_id, hid_t mem_type_id, const void *buf )</code></pre>

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Fortran90:

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<pre><code class="language-fortran">  SUBROUTINE h5awrite_f(attr_id, memtype_id, buf, dims, hdferr) 
    INTEGER(HID_T)  , INTENT(IN)               :: attr_id
    INTEGER(HID_T)  , INTENT(IN)               :: memtype_id
    TYPE            , INTENT(IN)               :: buf
    INTEGER(HSIZE_T), INTENT(IN), DIMENSION(*) :: dims
    INTEGER         , INTENT(OUT)              :: hdferr</code></pre>

Fortran2003:

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<pre><code class="language-fortran"> SUBROUTINE h5awrite_f(attr_id, memtype_id, buf, hdferr) 
    INTEGER(HID_T)  , INTENT(IN)  :: attr_id
    INTEGER(HID_T)  , INTENT(IN)  :: memtype_id
    TYPE(C_PTR)     , INTENT(IN)  :: buf
    INTEGER         , INTENT(OUT) :: hdferr</code></pre>

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Parameters:

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hid_t `attr_id`	IN: Identifier of an attribute to write
hid_t `mem_type_id`	IN: Identifier of the attribute datatype (in memory)
const void * `buf`	IN: Data to be written

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Description:

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H5A_WRITE writes an attribute, specified with attr_id . The attribute's memory datatype is specified with mem_type_id . The entire attribute is written from buf to the file.

If mem_type_id is either a fixed-length or variable-length string, it is important to set the string length when defining the datatype. String datatypes are derived from H5T_C_S1 (or H5T_FORTRAN_S1 for Fortran codes), which defaults to 1 character in size. See H5T_SET_SIZE and Creating variable-length string datatypes.

Datatype conversion takes place at the time of a read or write and is automatic. See the “Data the “Data Transfer: Datatype Conversion and Selection” section Selection” section in the “HDF5 Datatypes” chapter of the HDF5 User’s Guide for a discussion of data conversion.

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Returns:

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Returns a non-negative value if successful; otherwise returns a negative value.

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Example:

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Bitbucket Server file

repoSlug	hdf5
branchId	refs/heads/1.10/master
projectKey	HDFFV
filepath	examples/h5_subset.c
showLineNumbers	true
lineStart	32
progLang	cpp
lineEnd	42
applicationLink	5ac7b370-7412-3c8c-ad20-807a68261336

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Bitbucket Server file

repoSlug	hdf5
branchId	refs/heads/1.10/master
projectKey	HDFFV
filepath	fortran/examples/compound.f90
showLineNumbers	true
lineStart	25
progLang	plain
lineEnd	35
applicationLink	5ac7b370-7412-3c8c-ad20-807a68261336

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History:

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Release	Change
1.8.8	Fortran updated to Fortran2003.
1.4.2	Fortran `dims` parameter added in this release.

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