How to use FFI (Foreign Function Interface) in Dart?

Dart FFI allows you to directly call C/C++ APIs without going through the Flutter MethodChannel overhead.

FFI binds Dart code directly to native dynamic libraries (.so, .dylib, .dll). You define Dart signatures that match the C structs and functions, look up the symbol, and invoke it. It runs synchronously on the same thread, making it incredibly fast for heavy computational libraries.