SDK编程中窗口ID,句柄,指针三者相互转换函数
    ID--HANDLE--HWND三者之间的互相转换
    id->句柄-----------hWnd = ::GetDlgItem(hParentWnd,id);
    id->指针-----------CWnd::GetDlgItem();
    句柄->id-----------id = GetWindowLong(hWnd,GWL_ID);
    句柄->指针--------CWnd *pWnd=CWnd::FromHandle(hWnd);
    指针->ID----------id = GetWindowLong(pWnd->GetSafeHwnd,GWL_ID);
    GetDlgCtrlID();
    指针->句柄--------hWnd=cWnd.GetSafeHandle() or mywnd->m_hWnd;

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