#define ID_TIMER_DISPLAY_DELAY 30

#define ID_TIMER_DISPLAY_CLOSE 40

void SetAlpha(HWND hWnd,int Alpha);

int m_nFlag ;

void CPopUpWnd::SetAlpha(HWND hWnd,int Alpha)
{

HINSTANCE hInst = LoadLibrary(L"User32.DLL");
  if(hInst)
  {
    typedef BOOL (WINAPI *MYFUNC)(HWND,COLORREF,BYTE,DWORD);
    MYFUNC fun = NULL;
   //取得SetLayeredWindowAttributes函数指针
   fun=(MYFUNC)GetProcAddress(hInst, "SetLayeredWindowAttributes");
   if(fun)fun(hWnd,0,Alpha,2);
   FreeLibrary(hInst);
   }

}

void CPopUpWnd::OnPrepare()

{

    //直接显示在右下角

    MoveSelfWindow();

    //修改窗口属性为了窗口透明度

    SetWindowLong(m_hWnd,GWL_EXSTYLE,GetWindowLong(m_hWnd,GWL_EXSTYLE)^0x80000);

//3秒后改变窗口透明度
     SetTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY,3000,NULL);

}

LRESULT CPopUpWnd::OnTimer(UINT uMsg, WPARAM wParam, LPARAM lParam,BOOL& bHandled)

{

    switch(wParam)

    {//多个定时器

    case ID_TIMER_DISPLAY_DELAY:

        KillTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY);

        SetTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE,,NULL);

        break;

    case ID_TIMER_DISPLAY_CLOSE:

        {

            if(m_nFlag < )

            {

                m_nFlag+= ;

                SetAlpha(m_hWnd,-m_nFlag);

            }

            else

            {

                KillTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE);

                Close(IDCLOSE);

                m_nFlag = ;

            }

        }

        break;

    }

    return ;

}

LRESULT CPopUpWnd::OnMouseEnter(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)

{

       .....

    //KillTimer(m_hWnd,ID_TIMER_DISPLAY_DELAY);

    KillTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE);

    if (m_nFlag < )

    {

        SetAlpha(m_hWnd,);

    }

      ....

    return ;

}

LRESULT CPopUpWnd::OnMouseLeave(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)

{

    .....

    SetTimer(m_hWnd,ID_TIMER_DISPLAY_CLOSE,,NULL);

    m_nFlag = ;

       ....

    return ;

}