//加载菜单
CMenu menu;
menu.LoadMenu(IDR_MENU1); // 读取资源
ClientToScreen(&point);
menu.GetSubMenu(0) -> TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this );
//先转换座标, 再赋值
ScreenToClient(&point);
tempPt = point ;