The nsIInterfaceRequestor interface defines a generic interface for
requesting interfaces that a given object might provide access to.
This is very similar to QueryInterface found in nsISupports.
The main difference is that interfaces returned from GetInterface()
are not required to provide a way back to the object implementing this
interface. The semantics of QI() dictate that given an interface A that
you QI() on to get to interface B, you must be able to QI on B to get back
to A. This interface however allows you to obtain an interface C from A
that may or most likely will not have the ability to get back to A.
Retrieves the specified interface pointer.
| uuid | The IID of the interface being requested. |
| result | [out] The interface pointer to be filled in if the interface is accessible. @throws NS_NOINTERFACE - interface not accessible. @throws NS_ERROR* - method failure. |