System.TInterfacedObject.QueryInterface

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Object Pascal

function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;

C++

HRESULT __stdcall QueryInterface(REFIID IID, /* out */ void *Obj);

Properties

Type Visibility Source Unit Parent
function protected
System.pas
systobj.h
System TInterfacedObject

Description

Implements the IInterfaceQueryInterface method.

Do not call the protected QueryInterface method directly. QueryInterface is called through IInterface to obtain an interface pointer for the interface identified by the IID parameter. If the object supports the requested interface, it is returned in the Obj parameter and QueryInterface returns S_OK. If the object does not support the interface, QueryInterface returns E_NOINTERFACE.

If QueryInterface successfully returns an interface pointer, it automatically increments the reference count.

See Also