MFC中窗口句柄总结

对于同一个窗口而言，其指针是pWnd，句柄是hWnd，ID是nID,其三者转换关系如下

指针->句柄：hWnd = pWnd->GetSafeHwnd();  ID->句柄：hWnd = ::GetDlgItem(hParentWnd, ID);  句柄->指针：pWnd = CWnd::FromHandle(hWnd);  ID->指针：pWnd = Cwnd::GetDlgItem();  指针->ID：ID = GetWindowLong(pWnd->GetSafeHwnd(), GWL_ID);  句柄->ID：ID = GetWindowLong(hWnd, GWL_ID);