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.
Retrieves the specified interface pointer.
NS_NOINTERFACE - interface not accessible.
NS_ERROR* - method failure.
The IID of the interface being requested.
[out] The interface pointer to be filled in if the interface is accessible.
Generated using TypeDoc
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.