H5O_VISIT_BY_NAME1

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Excerpt
Recursively visits all objects starting from a specified object

Note
As of HDF5-1.12 this function has been deprecated in favor of the function H5O_VISIT_BY_NAME3 or the macro H5O_VISIT_BY_NAME.

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Procedure:

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H5O_VISIT_BY_NAME1( loc_id, obj_name, idx_type, order, op, op_data, lapl_id )

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<pre><code class="language-c">herr_t H5Ovisit_by_name1 ( hid_t loc_id, const char obj_name, H5_index_t idx_type, H5_iter_order_t order, H5O_iterate1_t op, void op_data, hid_t lapl_id )</code></pre>

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<pre><code class="language-fortran">SUBROUTINE h5ovisit_by_name_f(loc_id, object_name, index_type, order, &
       op, op_data, return_value, hdferr, lapl_id)
    USE, INTRINSIC :: ISO_C_BINDING
    IMPLICIT NONE
    INTEGER(HID_T)  , INTENT(IN)             :: loc_id
    CHARACTER(LEN=*), INTENT(IN)             :: object_name
    INTEGER         , INTENT(IN)             :: index_type 
    INTEGER         , INTENT(IN)             :: order

    TYPE(C_FUNPTR)                           :: op
    TYPE(C_PTR)                              :: op_data
    INTEGER         , INTENT(OUT)            :: return_value
    INTEGER         , INTENT(OUT)            :: hdferr
    INTEGER(HID_T)  , INTENT(IN) , OPTIONAL  :: lapl_id</code></pre>

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AnchorName	parameters

Parameters:

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hid_t `loc_id`	IN: Location identifier; may be a file, group, dataset, named datatype or attribute identifier
const char *`obj_name`	IN: Name of the object, generally relative to `loc_id`, that will serve as root of the iteration
H5_index_t `idx_type`	IN: Type of index; valid values include: `H5_INDEX_NAME` `H5_INDEX_CRT_ORDER`
H5_iter_order_t `order`	IN: Order in which index is traversed; valid values include: `H5_ITER_DEC` `H5_ITER_INC` `H5_ITER_NATIVE`
H5O_iterate1_t `op`	IN: Callback function passing data regarding the object to the calling application
void *`op_data`	IN: User-defined pointer to data required by the application for its processing of the object
hid_t `lapl_id`	IN: Link access property list identifier

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Description:

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H5O_VISIT_BY_NAME1 is a recursive iteration function to visit the object specified by the loc_id / obj_name parameter pair and, if that object is a group, all objects in and below it in an HDF5 file, thus providing a mechanism for an application to perform a common set of operations across all of those objects or a dynamically selected subset. For non-recursive iteration across the members of a group, see H5L_ITERATE1 .

The object serving as the root of the iteration is specified by the loc_id / obj_name parameter pair. loc_id specifies a file or an object in a file; obj_name specifies either an object in the file (with an absolute name based in the file’s root group) or an object name relative to loc_id. If loc_id fully specifies the object that is to serve as the root of the iteration, obj_name should be '.' (a dot). (Note that when loc_id fully specifies the the object that is to serve as the root of the iteration, the user may wish to consider using H5O_VISIT1 instead of H5O_VISIT_BY_NAME1.)

Two parameters are used to establish the iteration: idx_type and order.

idx_type specifies the index to be used. If the links in a group have not been indexed by the index type, they will first be sorted by that index then the iteration will begin; if the links have been so indexed, the sorting step will be unnecessary, so the iteration may begin more quickly. Valid values include the following:

`H5_INDEX_NAME`	Alpha-numeric index on name
`H5_INDEX_CRT_ORDER`	Index on creation order

Note that the index type passed in idx_type is a best effort setting. If the application passes in a value indicating iteration in creation order and a group is encountered that was not tracked in creation order, that group will be iterated over in alpha-numeric order by name, or name order. (Name order is the native order used by the HDF5 library and is always available.)

order specifies the order in which objects are to be inspected along the index specified in idx_type. Valid values include the following:

`H5_ITER_INC`	Increasing order
`H5_ITER_DEC`	Decreasing order
`H5_ITER_NATIVE`	Fastest available order

The op callback function and the effect of the callback function’s return value on the application are described in H5O_VISIT1.

The H5O_info1_t struct is defined in H5Opublic.h and described in the H5O_GET_INFO1 function entry.

The H5O_VISIT_BY_NAME1 op_data parameter is a user-defined pointer to the data required to process objects in the course of the iteration. This pointer is passed back to each step of the iteration in the callback function’s op_data parameter.

lapl_id is a link access property list. In the general case, when default link access properties are acceptable, this can be passed in as H5P_DEFAULT. An example of a situation that requires a non-default link access property list is when the link is an external link; an external link may require that a link prefix be set in a link access property list (see H5P_SET_ELINK_PREFIX).

H5L_VISIT_BY_NAME1 and H5O_VISIT_BY_NAME1 are companion functions: one for examining and operating on links; the other for examining and operating on the objects that those links point to. Both functions ensure that by the time the function completes successfully, every link or object below the specified point in the file has been presented to the application for whatever processing the application requires.

Note

Programming Note for C++ Developers Using C Functions:

If a C routine that takes a function pointer as an argument is called from within C++ code, the C routine should be returned from normally.

Examples of this kind of routine include callbacks such as H5P_SET_ELINK_CB and H5P_SET_TYPE_CONV_CB and functions such as H5T_CONVERT and H5E_WALK2.

Exiting the routine in its normal fashion allows the HDF5 C library to clean up its work properly. In other words, if the C++ application jumps out of the routine back to the C++ “catch” statement, the library is not given the opportunity to close any temporary data structures that were set up when the routine was called. The C++ application should save some state as the routine is started so that any problem that occurs might be diagnosed.

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Returns:

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On success, returns the return value of the first operator that returns a positive value, or zero if all members were processed with no operator returning non-zero.

On failure, returns a negative value if something goes wrong within the library, or the first negative value returned by an operator.

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Example:

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Comment

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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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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
1.10.5	The macro H5O_VISIT_BY_NAME was removed and the function H5O_VISIT_BY_NAME1 was copied to H5O_VISIT_BY_NAME.
1.10.3	The H5O_VISIT_BY_NAME function was renamed to H5O_VISIT_BY_NAME1, and the macro H5O_VISIT_BY_NAME was created
1.8.11	Fortran subroutine introduced in this release.
1.8.0	Function introduced in this release.

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