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H5P_INSERT2

Registers a temporary property with a property list

Procedure:

H5P_INSERT2 ( plid, name, size, value, set, get, delete, copy, compare, close )

Signature:

herr_t H5Pinsert2(
                  hid_t plid,
                  const char *name,
                  size_t size,
                  void *value,
                  H5P_prp_set_func_t set,
                  H5P_prp_get_func_t get,
                  H5P_prp_delete_func_t delete,
                  H5P_prp_copy_func_t copy,
                  H5P_prp_compare_func_t compare,
                  H5P_prp_close_func_t close
		)
  

NONE

Parameters:
hid_t plidIN: Property list identifier to create temporary property within
const char * nameIN: Name of property to create
size_t sizeIN: Size of property in bytes
void * valueIN: Initial value for the property
H5P_prp_set_func_t setIN: Callback routine called before a new value is copied into the property's value
H5P_prp_get_func_t getIN: Callback routine called when a property value is retrieved from the property
H5P_prp_delete_func_t delete    IN: Callback routine called when a property is deleted from a property list
H5P_prp_copy_func_t copyIN: Callback routine called when a property is copied from an existing property list
H5P_prp_compare_func_t compareIN: Callback routine called when a property is compared with another property list
H5P_prp_close_func_t closeIN: Callback routine called when a property list is being closed and the property value will be disposed of

Description:

H5P_INSERT2 creates a new property in a property list. The property will exist only in this property list and copies made from it.

The initial property value must be provided in value and the property value will be set accordingly.

The name of the property must not already exist in this list, or this routine will fail.

The set and get callback routines may be set to NULL if they are not needed.

Zero-sized properties are allowed and do not store any data in the property list. The default value of a zero-size property may be set to NULL. They may be used to indicate the presence or absence of a particular piece of information.

The set routine is called before a new value is copied into the property. The H5P_prp_set_func_t callback function is defined as follows:

typedef herr_t ( *H5P_prp_set_func_t )( hid_t prop_id, const char * name, size_t size, void * new_value );

The parameters to the callback function are defined as follows:

hid_t prop_idIN: The identifier of the property list being modified
const char * nameIN: The name of the property being modified
size_t sizeIN: The size of the property in bytes
void ** new_valueIN: Pointer to new value pointer for the property being modified

The set routine may modify the value pointer to be set and those changes will be used when setting the property's value. If the set routine returns a negative value, the new property value is not copied into the property and the set routine returns an error value. The set routine will be called for the initial value.

Note: The set callback function may be useful to range check the value being set for the property or may perform some transformation or translation of the value set. The get callback would then reverse the transformation or translation. A single get or set callback could handle multiple properties by performing different actions based on the property name or other properties in the property list.

The get routine is called when a value is retrieved from a property value. The H5P_prp_get_func_t callback function is defined as follows:

typedef herr_t ( *H5P_prp_get_func_t )( hid_t prop_id, const char * name, size_t size, void * value);

The parameters to the above callback function are:

hid_t prop_idIN: The identifier of the property list being queried
const char * nameIN: The name of the property being queried
size_t sizeIN: The size of the property in bytes
void * valueIN: The value of the property being returned

The get routine may modify the value to be returned from the query and those changes will be preserved. If the get routine returns a negative value, the query routine returns an error value.

The delete routine is called when a property is being deleted from a property list. The H5P_prp_delete_func_t callback function is defined as follows:

typedef herr_t ( *H5P_prp_delete_func_t )( hid_t prop_id, const char * name, size_t size, void * value );

The parameters to the above callback function are:

hid_t prop_idIN: The identifier of the property list the property is being deleted from
const char * nameIN: The name of the property in the list
size_t sizeIN: The size of the property in bytes
void * valueIN: The value for the property being deleted

The delete routine may modify the value passed in, but the value is not used by the library when the delete routine returns. If the delete routine returns a negative value, the property list delete routine returns an error value but the property is still deleted.

The copy routine is called when a new property list with this property is being created through a copy operation. The H5P_prp_copy_func_t callback function is defined as follows:

typedef herr_t ( *H5P_prp_copy_func_t )( const char * name, size_t size, void * value );

The parameters to the above callback function are:

const char * nameIN: The name of the property being copied
size_t sizeIN: The size of the property in bytes
void * valueIN/OUT: The value for the property being copied

The copy routine may modify the value to be set and those changes will be stored as the new value of the property. If the copy routine returns a negative value, the new property value is not copied into the property and the copy routine returns an error value.

The compare routine is called when a property list with this property is compared to another property list with the same property. The H5P_prp_compare_func_t callback function is defined as follows:

typedef int ( *H5P_prp_compare_func_t )( const void * value1, const void * value2, size_t size );

The parameters to the callback function are defined as follows:

const void * value1IN: The value of the first property to compare
const void * value2IN: The value of the second property to compare
size_t sizeIN: The size of the property in bytes

The compare routine may not modify the values. The compare routine should return a positive value if value1 is greater than value2, a negative value if value2 is greater than value1 and zero if value1 and value2 are equal.

The close routine is called when a property list with this property is being closed. The H5P_prp_close_func_t callback function is defined as follows:

typedef herr_t ( *H5P_prp_close_func_t )( const char * name, size_t size, void * value );

The parameters to the callback function are defined as follows:

const char * nameIN: The name of the property in the list
size_t sizeIN: The size of the property in bytes
void * valueIN: The value for the property being closed

The close routine may modify the value passed in, the value is not used by the library when the close routine returns. If the close routine returns a negative value, the property list close routine returns an error value but the property list is still closed.

Note: There is no create callback routine for temporary property list objects; the initial value is assumed to have any necessary setup already performed on it.

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.

Returns:

Success: a non-negative value Failure: a negative value

Example:

Coming Soon!

History:
Release    C
1.8.0Function introduced in this release.

--- Last Modified: December 10, 2018 | 04:02 PM