RAD Studio VCL Reference
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Returns a reference to a specified interface, if the object supports that interface.
function QueryInterface(const IID: TGUID; out Obj): HResult; stdcall;
QueryInterface checks whether the object that implements this interface supports the interface specified by IID. If so, QueryInterface sets the Obj parameter so that it points to an instance of the specified interface. If the object supports the interface, 0 is returned; otherwise QueryInterface returns a nonzero error code such as E_NOINTERFACE.
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