Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Returns JavaScript iterator for all remaining entries in the enumerator. Each entry is queried only to the supplied interface. If any element fails to query to that interface, the error is propagated to the caller.
Called to retrieve the next element in the enumerator. The "next" element is the first element upon the first call. Must be pre-ceeded by a call to hasMoreElements() which returns PR_TRUE. This method is generally called within a loop to iterate over the elements in the enumerator.
hasMoreElements()
NS_ERROR_FAILURE if there are no more elements to enumerate.
the next element in the enumeration.
Called to determine whether or not the enumerator has any elements that can be returned via getNext(). This method is generally used to determine whether or not to initiate or continue iteration over the enumerator, though it can be called without subsequent getNext() calls. Does not affect internal state of enumerator.
getNext()
true if there are remaining elements in the enumerator. false if there are no more elements in the enumerator.
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Increases the reference count for this interface. The associated instance will not be deleted unless the reference count is returned to zero.
Returns
The resulting reference count.