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H5R: Reference Interface

Reference API Functions

The Reference interface allows the user to create references to specific objects and data regions in an HDF5 file.

The C Interfaces:

The FORTRAN90 Interfaces:
In general, each FORTRAN90 subroutine performs exactly the same task as the corresponding C function. The links below go to the C function descriptions, which serve as general descriptions for both. A button, under Non-C API(s) at the end of the C function description, opens an external browser window displaying the FORTRAN90-specific information. You will probably want to adjust the size and location of this external window so that both browser windows are visible and to facilitate moving easily between them.
             


Name: H5Rcreate
Signature:
herr_t H5Rcreate(void *ref, hid_t loc_id, const char *name, H5R_type_t ref_type, hid_t space_id )
Purpose:
Creates a reference.
Description:
H5Rcreate creates the reference, ref, of the type specified in ref_type, pointing to the object name located at loc_id.

The parameters loc_id and name are used to locate the object.

The parameter space_id identifies the region to be pointed to (for dataset region references).

Parameters:
void *ref
OUT: Reference created by the function call.
hid_t loc_id
IN: Location identifier used to locate the object being pointed to.
const char *name
IN: Name of object at location loc_id.
H5R_type_t ref_type
IN: Type of reference.
hid_t space_id
IN: Dataspace identifier with selection. Used for dataset region references.
Returns:
Returns a non-negative value if successful; otherwise returns a negative value.
Non-C API(s):

Name: H5Rdereference
Signature:
hid_t H5Rdereference(hid_t dataset, H5R_type_t ref_type, void *ref )
Purpose:
Opens the HDF5 object referenced.
Description:
Given a reference to some object, H5Rdereference opens that object and returns an identifier.

The parameter ref_type specifies the reference type of ref. ref_type may contain either of the following values:

Parameters:
hid_t dataset
IN: Dataset containing reference object.
H5R_type_t ref_type
IN: The reference type of ref.
void *ref
IN: Reference to open.
Returns:
Returns valid identifier if successful; otherwise returns a negative value.
Non-C API(s):

Name: H5Rget_region
Signature:
hid_t H5Rget_region(hid_t dataset, H5R_type_t ref_type, void *ref )
Purpose:
Retrieves a dataspace with the specified region selected.
Description:
Given a reference to an object ref, H5Rget_region creates a copy of the dataspace of the dataset pointed to and defines a selection in the copy which is the region pointed to.

The parameter ref_type specifies the reference type of ref. ref_type may contain the following value:

Parameters:
hid_t dataset,
IN: Dataset containing reference object.
H5R_type_t ref_type,
IN: The reference type of ref.
void *ref
IN: Reference to open.
Returns:
Returns a valid identifier if successful; otherwise returns a negative value.
Non-C API(s):

Name: H5Rget_object_type
Signature:
int H5Rget_object_type(hid_t id, void *ref )
Purpose:
Retrieves the type of object that an object reference points to.
Description:
Given a reference to an object ref, H5Rget_object_type returns the type of the object pointed to.
Parameters:
hid_t id,
IN: The dataset containing the reference object or the location identifier of the object that the dataset is located within.
void *ref
IN: Reference to query.
Returns:
Returns an object type as defined in H5Gpublic.h; otherwise returns H5G_UNKNOWN.
Non-C API(s):

Introduction to HDF5 
HDF5 User Guide 
Other HDF5 documents and links 
And in this document, the HDF5 Reference Manual  
H5   H5A   H5D   H5E   H5F   H5G   H5I   H5P  
H5R   H5RA   H5S   H5T   H5Z   Tools   Datatypes  

HDF Help Desk
Last modified: 13 July 2000
Describes HDF5 Release 1.4 Beta, December 2000