Logtalk reference manual
Built-in method: message_prefix_stream/4
Contents > Reference Manual > Built-in Methods > message_prefix_stream/4

## message_prefix_stream/4

#### Description

    message_prefix_stream(Kind, Component, Prefix, Stream)

User-defined hook method for specifying the default prefix and stream for printing a message for a given kind and component. This method is declared in the `logtalk` built-in object as a public, multifile, and dynamic predicate.

#### Template and modes

    message_prefix_stream(?nonvar, ?nonvar, ?atom, ?stream_or_alias)

#### Errors

`(none)`

#### Examples

    :- multifile(logtalk::message_prefix_stream/4).
    :- dynamic(logtalk::message_prefix_stream/4).

    logtalk::message_prefix_stream(information, core, '% ', user_output).

#### See also

`message_hook/4`, `message_tokens//2`, `print_message/3`, `print_message_tokens/3`, `print_message_token/4`
`ask_question/5`, `question_hook/6`, `question_prompt_stream/4`