#include "pch.h" #include "WinHookEventIDs.h" UINT WM_PRIV_SETTINGS_CHANGED; std::once_flag init_flag; void InitializeWinhookEventIds() { std::call_once(init_flag, [&] { WM_PRIV_SETTINGS_CHANGED = RegisterWindowMessage(L"{11978F7B-221A-4E65-B8A8-693F7D6E4B25}"); }); }