Struct glib::LogField

#[repr(transparent)]
pub struct LogField<'a>(_, _);

Structure representing a single field in a structured log entry.

See g_log_structured for details. Log fields may contain UTF-8 strings, binary with embedded nul bytes, or arbitrary pointers.

Implementations

impl<'a> LogField<'a>

pub fn new(key: &'a GStr, value: &[u8]) -> Self

Creates a field from a borrowed key and value.

pub fn new_user_data(key: &'a GStr, data: usize) -> Self

Creates a field with an empty value and data as a user data key. Fields created with this function are ignored by the default log writer. These fields are used to pass custom data into a writer function set with log_set_writer_func, where it can be retreived using Self::user_data.

The passed usize can be used by the log writer as a key into a static data structure. Thread locals are preferred since the log writer function will run in the same thread that invoked log_structured_array.

pub fn key(&self) -> &str

Retreives the field key.

pub fn value_bytes(&self) -> Option<&[u8]>

Retrieves a byte array of the field value. Returns None if the field was created with Self::new_user_data.

pub fn value_str(&self) -> Option<&str>

Retrieves a string of the field value, or None if the string is not valid UTF-8. Also returns None if the field was created with Self::new_user_data.

pub fn user_data(&self) -> Option<usize>

Retrieves the the user data value from a field created with Self::new_user_data. Returns None if the field was created with Self::new.

Trait Implementations

impl<'a> Debug for LogField<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.