Struct LaunchOptions 

pub struct LaunchOptions {
    pub account: Account,
    pub java_executable: Option<PathBuf>,
    pub game_directory: Option<PathBuf>,
    pub natives_directory: Option<PathBuf>,
    pub launcher_name: String,
    pub launcher_version: String,
    pub custom_resolution: Option<(u32, u32)>,
    pub demo: bool,
    pub server: Option<(String, Option<u16>)>,
    pub disable_multiplayer: bool,
    pub disable_chat: bool,
    pub compatibility: CompatibilityPolicy,
}

User and process settings used while building a launch command.

Start with LaunchOptions::default and override only the fields your launcher exposes. By default the game directory is isolated under <minecraft_dir>/versions/<version_id>, which keeps saves, options, logs, and mods separate per installed profile.

Fields

account: Account

Account values substituted into Minecraft’s auth placeholders.

java_executable: Option<PathBuf>

Java executable to run.

If omitted, the command uses java and relies on the caller’s PATH.

game_directory: Option<PathBuf>

Game directory passed as ${game_directory} and used as process CWD.

If omitted, a version-isolated directory is used.

natives_directory: Option<PathBuf>

Directory containing extracted native libraries.

If omitted, this points at <minecraft_dir>/versions/<version_id>/natives.

launcher_name: String

Launcher name passed to modern version argument templates.

launcher_version: String

Launcher version passed to modern version argument templates.

custom_resolution: Option<(u32, u32)>

Optional window size appended as --width and --height.

demo: bool

Enables Minecraft demo mode.

server: Option<(String, Option<u16>)>

Optional multiplayer server and port to join after launch.

disable_multiplayer: bool

Appends the modern --disableMultiplayer flag.

disable_chat: bool

Appends the modern --disableChat flag.

compatibility: CompatibilityPolicy

Controls whether known compatibility patches are applied before building.

Trait Implementations

impl Clone for LaunchOptions

fn clone(&self) -> LaunchOptions

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LaunchOptions

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

Formats the value using the given formatter.

impl Default for LaunchOptions

fn default() -> Self

Returns the “default value” for a type.