[#btck_logging_connection_create]
= btck_logging_connection_create
:mrdocs:

Start logging messages through the provided callback. Log messages produced before this function is first called are buffered and on calling this function are logged immediately.

== Synopsis

Declared in `<kernel/bitcoinkernel.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
[[nodiscard, __nonnull__]]
xref:btck_LoggingConnection-04.adoc[btck_LoggingConnection]*
btck_logging_connection_create(
    xref:btck_LogCallback.adoc[btck_LogCallback] log_callback,
    void* user_data,
    xref:btck_DestroyCallback.adoc[btck_DestroyCallback] user_data_destroy_callback);
----

== Return Value

A new kernel logging connection, or null on error.

[NOTE]
====
The return value https://en.cppreference.com/cpp/language/attributes/nodiscard[should not be discarded^].
====
== Parameters

[cols="1,4"]
|===
| Name| Description
| *log_callback* [in]
| Non‐null, function through which messages will be logged.
| *user_data* [in]
| Nullable, holds a user‐defined opaque structure. Is passed back to the user through the callback. If the user_data_destroy_callback is also defined it is assumed that ownership of the user_data is passed to the created logging connection.
| *user_data_destroy_callback* [in]
| Nullable, function for freeing the user data.
|===


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