System.Variants.TCustomVariantType.QueryInterface

• Up to Parent: TCustomVariantType

Delphi

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

C++

virtual HRESULT __stdcall QueryInterface(const GUID &IID, /* out */ void *Obj);

Properties

Type	Visibility	Source	Unit	Parent
function	protected	System.Variants.pas System.Variants.hpp	System.Variants	TCustomVariantType

Description

Returns a reference to a specified interface if the object supports that interface.

QueryInterface checks whether the TCustomVariantType object supports the interface specified by IID. If so, QueryInterface

increments the reference count.

sets the Obj parameter so that it points to an instance of the specified interface.

returns 0 to indicate success.

If the object does not support the interface, QueryInterface returns a nonzero error code such as E_NoInterface.

See Also

• _AddRef

• _Release