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Dart-sys

Rust bindings to the Dart ffi api

Prerequisites 🔧

You will need the following tools available on your system:

• Dart version 2.12 or higher
• Rust version 1.51 or higher
• Cargo
• Git

Unix/Linux 🐧

No additional requirements :)

MacOS 🍎

No additional requirements :)

Windows 🪟

On Windows platforms, dynamic libraries are linked against the executable, not into the executable as is the case o Unix platforms.

⚠️ Important ⚠️

This means that (on Windows) you will Need to have the Dart SDK installed and available on your system path to be able to compile Dart-sys.

Installing 📦

Run the following Cargo command in your project directory:

cargo add dart-sys

Or add the following line to your Cargo.toml:

dart-sys = "4.1.5"

Usage 💻

Examples 📚

An extremely straightforward example of using dart-sys would be like such:

use dart_sys::{Dart_Handle, Dart_NewIntegerFromI64};

#[no_mangle]
/// Adds two integers together.
pub extern "C" fn dart_sys_example_extension_sum(
    a: Dart_Handle,
    b: Dart_Handle,
) -> Dart_Handle {
    let a = unsafe { Dart_NewIntegerFromI64(a) };
    let b = unsafe { Dart_NewIntegerFromI64(b) };
    a + b
}

#[no_mangle]
/// Multiplies two integers together.
pub extern "C" fn dart_sys_example_extension_product(
    a: Dart_Handle,
    b: Dart_Handle,
) -> Dart_Handle {
    let a = unsafe { Dart_NewIntegerFromI64(a) };
    let b = unsafe { Dart_NewIntegerFromI64(b) };
    a * b
}

import 'dart:ffi';

// open and link to the native library
final DynamicLibrary nativeLib = DynamicLibrary.open('libdart_sys_example_extension.so');

// lookup the sum function in the native library
final int Function(int, int) sum = nativeLib
    .lookup<NativeFunction<Int32 Function(Int32, Int32)>>('dart_sys_example_extension_sum')
    .asFunction();

// lookup the product function in the native library
final int Function(int, int) product = nativeLib
    .lookup<NativeFunction<Int32 Function(Int32, Int32)>>('dart_sys_example_extension_product')
    .asFunction();

void main() {
    print(sum(1, 2)); // 3
    print(product(1, 2)); // 2
}

While this example is certainly possible, you are not likely to ever use Dart-sys for this purpose. See the examples directory for more in-depth examples of how to use Dart-sys. All examples are tested using GitHub Actions and documented verbosely.

Built With 🛠️

• Rust - A systems programming language that runs blazingly fast, prevents segfaults, and guarantees thread safety.
• Dart - A client-optimized language for fast apps on any platform.
• Dart Native Extensions - A mechanism for writing native code in C/C++ and calling it from Dart.
• bindgen - A Rust library for generating bindings to C and C++ APIs.

Contributing ✏️

Please read CONTRIBUTING.md for details on our code of conduct, and the process for submitting pull requests. If you have any questions, please open an issue, or contact admin gutenfries@gmail.com directly.

Versioning 🪧

We use SemVer for versioning. For the versions available, see the tags on this repository.

License 📜

Dart-sys is open-sourced and released under the terms and conditions of one or both of the following licenses:

• MIT License
• Apache License (Version 2.0)

Acknowledgments 🙏

• README starter by @PurpleBooth