I guess that if you get nil you may want to wait for a GET_ITEM_INFO_RECEIVED event whose arg1 will be the item id. When this event triggers the link should be available. This event will trigger a little bit after you call GetItemInfo() for an item not in the cache.
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"In this world nothing can be said to be certain, except that fractional reserve banking is a Ponzi scheme and that you won't believe it." - Mandrill
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