@bun-win32/bluetoothapis

@bun-win32/bluetoothapis

Zero-dependency, zero-overhead Win32 BluetoothApis bindings for Bun on Windows.

Overview

@bun-win32/bluetoothapis exposes the bluetoothapis.dll exports using Bun's FFI. It provides a single class, BluetoothApis, which lazily binds native symbols on first use. You can optionally preload a subset or all symbols up-front via Preload().

The bindings are strongly typed for a smooth DX in TypeScript.

Features

• Bun-first ergonomics on Windows 10/11.
• Direct FFI to bluetoothapis.dll (Bluetooth Classic radio/device discovery, BLE GATT, SDP, authentication).
• In-source docs in structs/BluetoothApis.ts with links to Microsoft Docs.
• Lazy binding on first call; optional eager preload (BluetoothApis.Preload()).
• No wrapper overhead; calls map 1:1 to native APIs.
• Strongly-typed Win32 aliases (see types/BluetoothApis.ts).

Requirements

• Bun runtime
• Windows 10 or later

Installation

bun add @bun-win32/bluetoothapis

Quick Start

import BluetoothApis from '@bun-win32/bluetoothapis';
import Kernel32 from '@bun-win32/kernel32';

// BLUETOOTH_FIND_RADIO_PARAMS: { dwSize: DWORD }
const params = Buffer.alloc(4);
params.writeUInt32LE(4, 0);

const hRadio = Buffer.alloc(8);
const hFind = BluetoothApis.BluetoothFindFirstRadio(params.ptr, hRadio.ptr);

if (hFind !== 0n) {
  const radioHandle = hRadio.readBigUInt64LE(0);
  console.log('Found radio handle:', radioHandle);

  // Get radio info
  const radioInfo = Buffer.alloc(520); // BLUETOOTH_RADIO_INFO size
  radioInfo.writeUInt32LE(520, 0);     // dwSize
  const err = BluetoothApis.BluetoothGetRadioInfo(radioHandle, radioInfo.ptr);
  if (err === 0) {
    const name = new TextDecoder('utf-16le').decode(radioInfo.subarray(264, 264 + 496)).replace(/\0.*$/, '');
    console.log('Radio name:', name);
  }

  Kernel32.CloseHandle(radioHandle);
  BluetoothApis.BluetoothFindRadioClose(hFind);
}

AI agents: see AI.md for the package binding contract and source-navigation guidance. It explains how to use the package without scanning the entire implementation.

Examples

Run the included examples:

cd packages/bluetoothapis && bun run example/bluetoothapis.ts

Notes

• Either rely on lazy binding or call BluetoothApis.Preload().
• Windows only. Bun runtime required.
• SAL types & naming: nullability is in the type — OPTIONAL<T> (formally optional, SAL _*opt_) and NULLABLE<T> (plain [in]/[out] the docs say can be NULL), the null sentinel derived from T (null for pointers LP*/P*, 0n for handles/by-value addresses); direction is in the parameter name — _out (_Out_), _in_out (_Inout_), _In_ bare. See AI.md and the repo AGENTS.md.