The LVM_SETITEMCOUNT message prepares a list view control for adding a large number of items. You can send this message explicitly or by using the ListView_SetItemCount macro.
LVM_SETITEMCOUNT wParam = (WPARAM) (int) cItems; lParam = 0;
No return value.
By sending the LVM_SETITEMCOUNT message before adding a large number of items, you enable a list view control to reallocate its internal data structures only once rather than every time you add an item.
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