hanburn : a line of code

void ForceForegroundWindow(HWND hWnd)
{
 if(hWnd == NULL) return;

 // DWORD SPI_GETFOREGROUNDLOCKTIMEOUT = 0x2000;
 // const DWORD SPI_SETFOREGROUNDLOCKTIMEOUT = 0x2001;

 DWORD ForegroundThreadID;
 DWORD ThisThreadID;
 DWORD Timeout;
 BOOL Result;

 if(GetForegroundWindow() == hWnd) {
  return;
 }
 else {
  // Windows 98/2000 doesn't want to foreground a window when some other
  // window has keyboard focus

  OSVERSIONINFO os;
  os.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
  GetVersionEx(&os);
  if((os.dwPlatformId == VER_PLATFORM_WIN32_NT && os.dwMajorVersion > 4) ||
   (os.dwPlatformId == VER_PLATFORM_WIN32_WINDOWS &&
   (os.dwMajorVersion > 4 || (os.dwMajorVersion == 4 && os.dwMinorVersion > 0)))){

    Result = FALSE;
    ForegroundThreadID = GetWindowThreadProcessId(GetForegroundWindow(), NULL);
    ThisThreadID = GetWindowThreadProcessId(hWnd, NULL);
    if(AttachThreadInput(ThisThreadID, ForegroundThreadID, TRUE)) {
     BringWindowToTop(hWnd);
     SetForegroundWindow(hWnd);
     AttachThreadInput(ThisThreadID, ForegroundThreadID, FALSE);
     Result = GetForegroundWindow() == hWnd;
    }

    if(!Result) {
     SystemParametersInfo(0x2000, 0, &Timeout, 0);
     SystemParametersInfo(0x2001, 0, NULL, SPIF_SENDCHANGE);
     BringWindowToTop(hWnd);
     SetForegroundWindow(hWnd);
     SystemParametersInfo(0x2001, 0, &Timeout, SPIF_SENDCHANGE);
    }
   }
  else
  {
   BringWindowToTop(hWnd);
   SetForegroundWindow(hWnd);
  }
 }
}

BOOL SetWindowTransparent(HWND hWnd, BYTE nAlpha)
{
 if( FALSE == ::IsWindow(hWnd))
  return FALSE;

#define LWA_ALPHA 0x00000002

 // 투명윈도우를 위한 LayeredWindow 설정
 long oldWinStyle = GetWindowLong(hWnd, GWL_STYLE);
 ::SetWindowLong(hWnd, GWL_STYLE,  oldWinStyle & WS_POPUPWINDOW & ~WS_BORDER );

 LONG style = ::GetWindowLong(hWnd, GWL_EXSTYLE);
 if(!(style & 0x00080000))
 {
  ::SetWindowLong(hWnd, GWL_EXSTYLE, style | 0x00080000);
 }

 typedef BOOL (WINAPI *SLWA)(HWND hWnd, COLORREF crKey, BYTE bAlpha, DWORD dwFlags);
 SLWA pSetLayeredWindowAttributes = NULL;
 HINSTANCE hUSER32 = LoadLibrary("USER32.DLL");
 pSetLayeredWindowAttributes=(SLWA)GetProcAddress(hUSER32,"SetLayeredWindowAttributes");
 BYTE chAlpha = nAlpha;
 pSetLayeredWindowAttributes(hWnd, NULL, chAlpha, LWA_ALPHA);
 FreeLibrary(hUSER32);

 return TRUE;
}