Windows 服务中取得桌面窗口句柄

VOID WINAPI MyService(DWORD dwArgc, LPTSTR * lpArgv)
{
  HWINSTA hWinSta = OpenWindowStation(_T("WinSta0"), TRUE, WINSTA_ALL_ACCESS);
  if (hWinSta)
  {
    SetProcessWindowStation(hWinSta);

    HDESK hDesk = OpenDesktop(L"Default", DF_ALLOWOTHERACCOUNTHOOK, TRUE, GENERIC_ALL);
    if (hDesk)
    {
      SetThreadDesktop(hDesk);

      HWND hWnd = NULL;

      while (hWnd = FindWindowEx(NULL, hWnd, NULL, NULL))
      {
        if (IsWindowVisible(hWnd))
        {     
          // ...
        }
      }

      CloseDesktop(hDesk);
    }

    CloseWindowStation(hWinSta);
  }
}