harald
A native Windows tray application for quick management of Bluetooth audio devices, written in C-style C++ against the raw Win32 API. One click to connect or disconnect your checked devices. Has build-in mini-installer.
Overview
harald lives quietly in the system tray and gives Bluetooth audio devices a single, fast entry point. Check the devices you care about in the menu, then left-click the tray icon to connect or disconnect them all at once. The whole thing starts in under 100 ms and uses a hand-rolled arena allocator instead of the heap.
Highlights
One-click toggle
Check devices in the menu, single-click to connect/disconnect them together.
Theme aware
Follows the Windows dark/light theme; the menu redraws on system colour changes.
Three connect paths
API (BluetoothSetServiceState), HCI link drop, or UI Automation — pick per action.
Toast notifications
Native Windows toasts name the devices; failure alerts on, success optional.
Media automation
Optionally pause on disconnect and play on connect.
Open data folder
Middle-click the tray icon to jump to %LOCALAPPDATA%\harald.
How it works
harald runs two threads. The UI thread owns the tray icon and three
custom-drawn popup windows (menu, settings, inline message) and never blocks. The
worker thread runs one connection batch at a time: discover paired audio
devices, decide connect/disconnect, dispatch via the chosen method, then settle by
re-discovering until the expected state holds. Results cross the boundary as fixed-size
ToggleRequest structs signalled by a semaphore.
Build
Unity builds are on by default and a Release build auto-compresses with UPX when available:
- MSVC:
cmake --preset msvc && cmake --build --preset msvc - clang:
cmake --preset clang && cmake --build --preset clang
Status
Actively maintained. Single instance enforced via named mutex; no telemetry, no data leaves the machine.