about WM_NOTIFY for CTreeCtrl

[muddog]

for my project , i have a CView contain a CTreeCtrl member. i want to cope with the tree notify message in the view. for instance : msg: TVN_ITEMEXPANDED CView::OnNotify(wParam , lParam , lpResult){ } as far as i know wParam as idCtrl, lParam as LPNMHDR strcut point. but msdn says TVN_ITEMEXPANDED pnmtv = (LPNMTREEVIEW) lParam . what really the lParam refer to?? help me. love program

[Senkwe Chanda]

I'm not into MFC but pnmtv = (LPNMTREEVIEW) lParam means you're casting the lParam into a pointer to an NMTREEVIEW structure. That structure probably contains a TVITEM structure as well,. I would guess you need to examine the state of that TVITEM. What's the difference between a C++ programmer and God? God knows he's not a C++ programmer : anon

[muddog]

i see , as i digesting into the document. lParam is not only a pointer to NMHDR even more of that. we could change the type of it to proper struct pointer such as LPNMTREEVIEW. thank you. love program