Vcl.Forms.TCustomForm.QueryInterface
Delphi
function QueryInterface(const IID: TGUID; out Obj): HResult; override;
C++
virtual HRESULT __stdcall QueryInterface(const GUID &IID, /* out */ void *Obj);
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| function | protected | Vcl.Forms.pas Vcl.Forms.hpp |
Vcl.Forms | TCustomForm |
Description
Returns a reference to a specified interface if that interface is supported by the form.
For forms that support interfaces, QueryInterface calls the QueryInterface method of the interface supported by the form. QueryInterface returns a reference to the interface specified by the IID parameter, as the Obj parameter. If the form does not support the interface, the Obj parameter is nil (Delphi) or NULL (C++).
QueryInterface returns S_OK if the Obj parameter is successfully assigned.