RAD Studio VCL Reference
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TComponent.QueryInterface Method
TComponent Class | TComponent Members | Classes Namespace | Description | See Also
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Returns a reference to a specified interface if the object supports that interface.

Pascal
function QueryInterface(const IID: TGUID; out Obj): HResult; virtual; stdcall;
C++
virtual __fastcall __stdcall HRESULT QueryInterface(const TGUID IID,  Obj);
Description

QueryInterface checks whether the component supports the interface specified by IID, and if so, returns a reference to that interface as the Obj parameter. If the component does not support the interface, the Obj parameter returns nil (Delphi) or NULL (C++).

Note: For components that act as COM object wrapper, QueryInterface calls the QueryInterface method of the internal COM object.
 

See Also

_AddRef 

_Release 

QueryInterface 

QueryInterface 

Invoke 

ComObject

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