virtual table会发送LVN_GETDISPINFO 消息:
The LVN_GETDISPINFO notification message is sent by a list view control to its parent window. It is a request for the parent window to provide information needed to display or sort a list view item. The LVN_GETDISPINFO notification message is sent in the form of a WM_NOTIFY message.
LVN_GETDISPINFO
pnmv = (LV_DISPINFO FAR *) lParam;
