Magento - Accessing a customer's wishlist

I would like to be able to load a customer's wishlist and return the product id's of the products within the list

I am using:

$wishList = Mage::getSingleton('wishlist/wishlist')->loadByCustomer($customer);
 $wishListItemCollection = $wishList->getItemCollection();
 

The problem is that the arrays in the Item Collection are protected and I can't find any methods to extract the data.

Is there another way to do this?

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