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CComPolyObject::QueryInterface

Retrieves a pointer to the requested interface.

STDMETHOD(QueryInterface)(
   REFIID iid,
   void** ppvObject 
);
template <class Q>
HRESULT QueryInterface(Q ** pp);

Параметры

  • Q
    The COM interface.

  • iid
    [in] The identifier of the interface being requested.

  • ppvObject
    [out] A pointer to the interface pointer identified by iid. If the object does not support this interface, ppvObject is set to NULL.

  • pp
    [out] A pointer to the interface identified by __uuidof(Q).

Возвращаемое значение

A standard HRESULT value.

Заметки

For an aggregated object, if the requested interface is IUnknown, QueryInterface returns a pointer to the aggregated object's own IUnknown and increments the reference count. Otherwise, this method queries for the interface through the CComContainedObject data member, m_contained.

Требования

Header: atlcom.h

См. также

Основные понятия

CComPolyObject Class

CComPolyObject Members