protected override void Run(Action readyCallback) { using (var manager = NativeMethods.IOHIDManagerCreate(IntPtr.Zero).ToCFType()) { RunAssert(manager.IsSet, "HidSharp IOHIDManagerCreate failed."); using (var matching = NativeMethods.IOServiceMatching("IOHIDDevice").ToCFType()) { RunAssert(matching.IsSet, "HidSharp IOServiceMatching failed."); var devicesChangedCallback = new NativeMethods.IOHIDDeviceCallback(DevicesChangedCallback); NativeMethods.IOHIDManagerSetDeviceMatching(manager.Handle, matching.Handle); NativeMethods.IOHIDManagerRegisterDeviceMatchingCallback(manager.Handle, devicesChangedCallback, IntPtr.Zero); NativeMethods.IOHIDManagerRegisterDeviceRemovalCallback(manager.Handle, devicesChangedCallback, IntPtr.Zero); var runLoop = NativeMethods.CFRunLoopGetCurrent(); NativeMethods.CFRetain(runLoop); NativeMethods.IOHIDManagerScheduleWithRunLoop(manager, runLoop, NativeMethods.kCFRunLoopDefaultMode); try { readyCallback(); NativeMethods.CFRunLoopRun(); } finally { NativeMethods.IOHIDManagerUnscheduleFromRunLoop(manager, runLoop, NativeMethods.kCFRunLoopDefaultMode); NativeMethods.CFRelease(runLoop); } GC.KeepAlive(devicesChangedCallback); } } }