MouseProc OneShot

[Saul775]

Hello:

I'm trying to accomplish a "One-Shot-Hook" on a WM_LBUTTONUP. When I mean one-shot, I mean I just want to hook the WM_LBUTTONUP ONCE and attain the x- and y-coordinates of the click. After the button is up on a specific window, I want the hook to be removed. I've completed an algorithm that does the job, but I'm not sure if it's the most efficient or most acceptable. Perhaps there is a better way than I've adapted. Any ideas and comments would be greatly appreciated. I've attached the DLL code as follows...

#pragma data_seg(".HKT")
HWND hWnd = NULL;
HHOOK hhk = NULL;
BOOL bCaptured = FALSE;
POINT pt = {0, 0};
#pragma data_seg()

BOOL WINAPI UnhookWindow()
{
  BOOL bResult;
  bResult = UnhookWindowsHookEx(hhk);
  return bResult;
}

LRESULT CALLBACK MouseProc(int nCode, WPARAM wParam, LPARAM lParam)
{
  if ((nCode == HC_ACTION) && (wParam == WM_LBUTTONUP))
  {
	// ALWAYS UNHOOKFIRST!  WHY?
    if (!UnhookWindow())
    {
      MessageBox(NULL, "Error unhooking.", "Error", MB_ICONEXCLAMATION | MB_OK);
      bCaptured = TRUE;
      return TRUE;
    }

    MOUSEHOOKSTRUCT* mhs;
    mhs = (MOUSEHOOKSTRUCT*)lParam;
    pt = mhs->pt;
    bCaptured = TRUE;
    return TRUE;
  }
  return CallNextHookEx(hhk, nCode, wParam, lParam);
}

BOOL WINAPI OneShotHookWindow(HWND hWndToHook, POINT* passedPt)
{
  hWnd = hWndToHook;
  hhk = SetWindowsHookEx(WH_MOUSE, (HOOKPROC)MouseProc, GetModuleHandle("AddMultiDLL.dll"), GetWindowThreadProcessId(hWnd, NULL));
  if (!hhk)
  {
    MessageBox(NULL, "Failed to set a hook.", "Error", MB_OK);
    return 0;
  }

  while (!bCaptured)
  {
    // JUST WAIT UNTIL FIRST INSTANCE OF WM_LBUTTONUP
  }

  *passedPt = pt;
  return 1;
}

Thank you once again for your comments.