Go-Rust FFI Example

This project demonstrates how to call Rust functions from Go using FFI (Foreign Function Interface).

Prerequisites

• Go 1.16 or later
• Rust and Cargo
• A C compiler (gcc or clang)

Dev

Initialize the Rust Project and Generate Header File

cargo new rust_ffi --lib
cd rust_ffi
cbindgen --config cbindgen.toml --output src/rust_ffi.h

Building and Running

1. First, build the Rust library:

cd rust_ffi
cargo build --release

2. Copy the DLL file rust_ffi.dll to where main.go is.

3. Then, run the Go program:

go run main.go

Project Structure

• rust_ffi/ - Rust library containing the FFI functions
• main.go - Go program that calls the Rust functions

Available Functions

The Rust library exposes the following functions:

• add(a: i32, b: i32) -> i32: Adds two integers
• multiply(a: i32, b: i32) -> i32: Multiplies two integers
• greet(name: *const u8, name_len: usize) -> *mut u8: Returns a greeting string
• free_string(s: *mut u8): Frees memory allocated by Rust