注册系统自动分配消息方法

#define MSG_RELAUNCH    _T("MSG_RELAUNCH")；
WM_RELAUNCH = ::RegisterWindowMessage(MSG_RELAUNCH); //系统注册消息id；
PostMessage(HWND_BROADCAST, WM_RELAUNCH, (WPARAM)WPARAM_RELAUNCH, NULL); //向所有窗口广播此消息，如窗口有WM_RELAUNCH，那么就用此窗口处理。
MESSAGE_HANDLER(WM_RELAUNCH, OnManagerRelaunch)；
LRESULT CMainFrame.:OnManagerRelaunch(UINT uMsg, WPARAM wParam, LPARAM lParam, BOOL& bHandled)
{
    if (wParam == WPARAM_RELAUNCH)
    {   
        ACDWindow_BringWindowToTop(m_hWnd);
        CheckAccountInRelaunch();
//        ShowInboxMonitor(0);

    }//if
    if (wParam == WPARAM_EXIT)
    {   
        DestroyWindow();
    }
    return 0;
}