Responding to console variable changes

Console variable changes can be handled by the Blueprint console variable asset that owns the variable, by a Blueprint callback registered for any console variable, or by Unreal's native C++ change tracking.

For Auto Settings registry value changes, see Responding to setting changes.

Option 1: Use a Blueprint console variable asset

Use Event OnChanged when the response belongs to an Auto Settings Blueprint console variable asset. For setup and an example, see Implement the OnChanged event.

Option 2: Register a callback function

Use a callback function when a Blueprint needs to listen to any registered console variable by name.

Use the typed callback function that matches the console variable value type:

• Register Bool Console Variable Changed Callback
• Register Int Console Variable Changed Callback
• Register Float Console Variable Changed Callback
• Register String Console Variable Changed Callback

Set Execute Callback to true when the callback should run immediately with the current value.

The console variable can be an engine variable, a Blueprint console variable asset, or another registered console variable. It must already be registered before the callback can be registered.

Register the callback and handle it:

Option 3: Use Unreal C++ change tracking

For native C++ systems, use Unreal's Console Variables C++ documentation for OnChangedCallback / SetOnChangedCallback and console variable sinks.