get_handle_object — Retrieve an object associated with a key from a handle.
get_handle_object retrieves an iconic object associated with the
Handle and returns it in
The list of keys supported by a handle can be queried with
Note that this operator is provided only for implementing generic
debug and inspection mechanisms.
The keys returned for certain handle types can change without notice.
Additionally, some handle types might not be supported by this operator.
Also, this operator is not optimized for performance.
To obtain more reliable information about a handle in a program, it is
strongly recommended to use the operators specialized for the particular
handle type, such as
Iconic value of the key.
Handle of which to get the key.
→(string / integer)
Key to get.
If the parameters are valid, the operator
returns the value TRUE. Otherwise, an exception is raised.