A Question about Treeview Macros

[LRantanen]

Hello, it's me and the Treeview again.

In COMMCTRL.INC following two macros are defined

%TVI_ROOT         = &HFFFF0000???

FUNCTION TreeView_DeleteItem (BYVAL hWnd AS DWORD, BYVAL hitem AS DWORD) AS LONG
    FUNCTION = SendMessage(hWnd, %TVM_DELETEITEM, 0, hitem)
END FUNCTION

FUNCTION TreeView_DeleteAllItems (BYVAL hWnd AS DWORD) AS LONG
    FUNCTION = SendMessage(hWnd, %TVM_DELETEITEM, 0, %TVI_ROOT)
END FUNCTION

Now I don't understand why following happens.

If I make following call

    TreeView_DeleteItem hWndTreeView, %TVI_ROOT

treeview gets cleared, but not if I call

    TreeView_DeleteAllItems hWndTreeView

The way I read the macro definitions makes me think that in both cases I finally make equal call to SendMessage. Why different result? Just curious, not real problem.

Lasse Rantanen
[email protected]

[LRantanen]

Came back because I forgot to say that following modification makes Treeview_DeleteAllItems macro to work

FUNCTION TreeView_DeleteAllItems (BYVAL hWnd AS DWORD) AS LONG
    LOCAL dwItem AS DWORD
    dwItem = %TVI_ROOT
    FUNCTION = SendMessage(hWnd, %TVM_DELETEITEM, 0, dwItem)
END FUNCTION

But still, could somebody explain me why?

Lasse Rantanen
[email protected]

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