set_message_tupleT_set_message_tupleSetMessageTupleSetMessageTuple (Operator)

Name

set_message_tupleT_set_message_tupleSetMessageTupleSetMessageTuple — Add a key/tuple pair to the message.

Signature

set_message_tuple( : : MessageHandle, Key, TupleData : )

Description

set_message_tupleset_message_tupleSetMessageTupleSetMessageTupleSetMessageTuple stores a tuple associated with a key in the message, which behaves as a dictionary-like data container. The message is denoted by the MessageHandleMessageHandleMessageHandleMessageHandlemessageHandle parameter.

TupleDataTupleDataTupleDataTupleDatatupleData including strings is copied by the operation, and can thus be immediately reused. An empty tuple is considered as a valid value that can be associated with the key. If any data (tuple or object) was already associated with given key (KeyKeyKeyKeykey), the old data is destroyed by set_message_tupleset_message_tupleSetMessageTupleSetMessageTupleSetMessageTuple and replaced by TupleDataTupleDataTupleDataTupleDatatupleData.

The KeyKeyKeyKeykey has to be a string or an integer. String keys are treated case sensitive.

The tuple data for the given key can be retrieved again from the message using get_message_tupleget_message_tupleGetMessageTupleGetMessageTupleGetMessageTuple.

Attention

Note that if the tuple contains any handles (which are treated as simple integers) only the handle values are copied by the operation, not the resources behind those handles.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

This operator modifies the state of the following input parameter:

MessageHandleMessageHandleMessageHandleMessageHandlemessageHandle

The value of this parameter may not be shared across multiple threads without external synchronization.

Parameters

MessageHandleMessageHandleMessageHandleMessageHandlemessageHandle (input_control, state is modified) message → (handle)

Message handle.

Number of elements: MessageHandle == 1

Restriction: MessageHandle != 0

KeyKeyKeyKeykey (input_control) string → (string / integer)

Key string or integer.

Number of elements: Key == 1

TupleDataTupleDataTupleDataTupleDatatupleData (input_control) tuple-array → (string / integer / real / handle)

Tuple value to be associated with the key.

Example (HDevelop)

create_message (Message)
set_message_tuple (Message, 'simple_integer', 27)
set_message_tuple (Message, 'simple_string', 'Hello world')
set_message_tuple (Message, 'mixed_tuple', ['The answer', 42])

Result

If the operation succeeds, set_message_tupleset_message_tupleSetMessageTupleSetMessageTupleSetMessageTuple returns 2 (H_MSG_TRUE). Otherwise an exception is raised. Possible error conditions include invalid parameters (handle or key) or resource allocation error.