Shoutbox

Hi,

I've got a 'simple' question.

TVN_BEGINLABELEDIT is sent in the form of a WM_NOTIFY message, the last one pointing to an NMHDR structure. In the documentation, they talk about the lParam being a pointer to an NMTVDISPINFO structure. There is no documentation on where to find that specific pointer. I don't think I'll find it in the NMHDR, and the idCtrl part of WM_NOTIFY isn't an NMHDR-pointer either.

Does anyone know where that pointer to NMTVDISPINFO is?

Thanks in advance.

quote:

---

Originally posted by SmokingCookie
they talk about the lParam being a pointer to an NMTVDISPINFO structure

---

That's it, just use the lParam as though it's a pointer to a NMTVDISPINFO structue

I hope I won't confuse you - NMTVDISPINFO is essentially a "substructure" (as "subclass" in OOP sense) of NMHDR

What do you mean??

Docs say that there's an NMHDR structure in lParam..? (or do I need glasses?)

The pointer to NMTVDISPINFO is the same as the pointer to TV_DISPINFO.

What you need to do is use RtlMoveMemory to copy the lParam memory to another location that is of adequate size.

js code:

---

function OnWindowEvent_MessageNotification(pPlusWnd, nMessage, wParam, lParam) {
        if (nMessage === WM_NOTIFY) {
                /*
                    NMHDR : 12
                    TVITEM : 40
                */
                var NMTVDISPINFO = Interop.Allocate(52);
                Interop.Call('kernel32', 'RtlMoveMemory', NMTVDISPINFO, lParam, 52);
        }
}

---

I see. This "NMTVDISPINFO" contains NMHDR and TVITEM, so I have access to both structures using RtlMoveMemory, right?

(Please correct me of I'm wrong)

no because NMTVDSPINFO is made up of both NMHDR and TVITEM therefore it is one structure 52 bytes in size. You access each by using ReadDWORD or ReadWORD. The NMHDR structure is from 0-8 and the TVITEM is fro 12-18.

Well, I got it working, thanks