[wxhaskell-users] TreeItemData in TreeCtrl

[James H. IV <hun...@gm...>]

Hello,

The following functions differ on the types for storing data in a TreeItem:

treeCtrlAddRoot uses TreeItemData
treeCtrlAppendItem uses TreeItemData
treeCtrlGetItemData uses Ptr ()
treeCtrlInsertItem uses Ptr g
treeCtrlInsertItemByIndex uses Ptr g
treeCtrlPrependItem uses Ptr f
treeCtrlSetItemData uses Ptr c

Why does the first two use TreeItemData while the rest use Ptr?  Why
is result of treeCtrlGetItemData Ptr ()?

Also, how do I store something in either case?

Thanks.