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.
|QueryReferent| queries the referent, if it exists, and like |QueryInterface|, produces an owning reference to the desired interface. It is designed to look and act exactly like (a proxied) |QueryInterface|. Don't hold on to the produced interface permanently; that would defeat the purpose of using a non-owning |nsIWeakReference| in the first place.
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An instance of |nsIWeakReference| is a proxy object that cooperates with its referent to give clients a non-owning, non-dangling reference. Clients own the proxy, and should generally manage it with an |nsCOMPtr| (see the type |nsWeakPtr| for a |typedef| name that stands out) as they would any other XPCOM object. The |QueryReferent| member function provides a (hopefully short-lived) owning reference on demand, through which clients can get useful access to the referent, while it still exists.
Version
1.0
See