1  #include "pch.h"
 2  
 3  #include "WinHookEventIDs.h"
 4  
 5  UINT WM_PRIV_SETTINGS_CHANGED;
 6  
 7  std::once_flag init_flag;
 8  
 9  void InitializeWinhookEventIds()
10  {
11      std::call_once(init_flag, [&] {
12          WM_PRIV_SETTINGS_CHANGED = RegisterWindowMessage(L"{11978F7B-221A-4E65-B8A8-693F7D6E4B25}");
13      });
14  }