Function SK_GetWindowThreadProcessId

src/window.cpp:9812–9850

DWORD
WINAPI
SK_GetWindowThreadProcessId ( _In_      HWND       hWnd,
                              _Out_opt_ LPDWORD lpdwProcessId )
{
  static
    concurrency::concurrent_unordered_map <
      HWND,                     std::pair <DWORD, DWORD>
    > _WindowThreadProcessIdCache;

  if (_WindowThreadProcessIdCache.count (hWnd) == 0)
  {
    DWORD      dwProcId;
    DWORD    dwThreadId =
      GetWindowThreadProcessId_Original != nullptr        ?
      GetWindowThreadProcessId_Original (hWnd, &dwProcId) :
      GetWindowThreadProcessId          (hWnd, &dwProcId);

    _WindowThreadProcessIdCache [hWnd] = std::make_pair (dwThreadId, dwProcId);

    if (lpdwProcessId != nullptr)
       *lpdwProcessId = dwProcId;

    return dwThreadId;
  }

  else
  {
    auto& thread_proc_id = _WindowThreadProcessIdCache [hWnd];

    if (lpdwProcessId != nullptr)
       *lpdwProcessId  = thread_proc_id.second;

    return thread_proc_id.first;
  }

  SK_ReleaseAssert (!L"Invalid Code Control Flow");
  return 0;
}