Dart FFI Advanced — C Library Integration, Memory Management, and Flutter Plugin

Introduction Dart FFI (Foreign Function Interface) lets you call C libraries directly from Dart and Flutter. Writing performance-critical code — image processing, cryptography, audio decoding — in Pure Dart is often impractical. FFI lets you leverage the entire C ecosystem instead. This article covers everything from loading a shared library to packaging your FFI code as a reusable Flutter plugin. 1. Calling C Functions with dart:ffi Start by examining the C library's function signatures: // nat