vc中句柄，指針，ID之間的轉(zhuǎn)換

SDK編程中窗口ID，句柄，指針三者相互轉(zhuǎn)換函數(shù)
    ID--HANDLE--HWND三者之間的互相轉(zhuǎn)換
    id->句柄-----------hWnd = ::GetDlgItem(hParentWnd,id);
    id->指針-----------CWnd::GetDlgItem();
    句柄->id-----------id = GetWindowLong(hWnd,GWL_ID);
    句柄->指針--------CWnd *pWnd=CWnd::FromHandle(hWnd);
    指針->ID----------id = GetWindowLong(pWnd->GetSafeHwnd,GWL_ID);
    GetDlgCtrlID();
    指針->句柄--------hWnd=cWnd.GetSafeHandle() or mywnd->m_hWnd;