MFC 判断单击双击

BOOL CXXXWnd::PreTranslateMessage(MSG* pMsg) 
{
    {
　　　　　　pClientPoint = pMsg->pt;
        MSG message;
        DWORD st = GetTickCount();
        while(1)   
        {   
            if(::PeekMessage(&message, NULL, 0 ,0 , PM_REMOVE))   
                {   
                    ::TranslateMessage(&message);   
                    ::DispatchMessage(&message);   
                    if(message.message == WM_LBUTTONDBLCLK)   
                    {  
                            //double cilck
                            break;
                    ｝            
                    DWORD et = GetTickCount();   
                    if(et - st > GetDoubleClickTime())      //GetDoubleClickTime = 500ms
                    {     
                        pClientPoint = pMsg->pt;
                        this->ScreenToClient(&pClientPoint);
                                
                        if (rectCoord.PtInRect(pClientPoint))
                        { 
                        }
                        else
                        {

                        }        
                    }
                       break;
                }   
        }   
    }
}