CComPolyObject::QueryInterface
Retrieves a pointer to the requested interface.
STDMETHOD(QueryInterface)(
REFIID iid,
void** ppvObject
);
template <class Q>
HRESULT QueryInterface(Q ** pp);
Parameters
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).
Return Value
A standard HRESULT value.
Remarks
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.
Requirements
Header: atlcom.h