Use QueFreeItems to free queue resources, allocated by QueAllocItems
function.
While this function executing OnDelete event handler is executed.
After that you may not use HNPacket objects, otherwise your application may
crash.
After QueFreeItems succeeds,
AllocatedSize [Get],
FreeCount [Get] and
FullCount [Get]
properties are set in 0.
If you use HNQueue object together with
HNAdapter object, you should remember that you have to
free queue resources in time by using of QueFreeItems function or by
deleting HNQueue object, otherwise your application may crash (see
AdpCloseAdapter).