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NF:unknwn.IUnknown.QueryInterface(Q) |
IUnknown::QueryInterface(Q,) |
A helper function template that infers an interface identifier, and calls [QueryInterface(REFIID,void)](/windows/desktop/api/unknwn/nf-unknwn-iunknown-queryinterface(refiid_void)). |
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com\iunknown_queryinterface.htm |
com |
54d5ff80-18db-43f2-b636-f93ac053146d |
05/31/2019 |
IUnknown interface [COM],QueryInterface method, IUnknown.QueryInterface, IUnknown.QueryInterface(Q,), IUnknown::QueryInterface, IUnknown::QueryInterface(Q,), QueryInterface, QueryInterface method [COM], QueryInterface method [COM],IUnknown interface, _com_iunknown_queryinterface, com.iunknown_queryinterface, unknwn/IUnknown::QueryInterface |
unknwn.h |
Windows |
Windows 2000 Professional [desktop apps only] |
Windows 2000 Server [desktop apps only] |
Unknwn.idl |
Windows |
19H1 |
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A helper function template that infers an interface identifier, and calls QueryInterface(REFIID,void).
Type: void**
The address of a pointer to an interface. For details, see the ppvObject parameter of QueryInterface(REFIID,void).
The function passes the return value back from QueryInterface(REFIID,void).
template<class Q>
HRESULT
STDMETHODCALLTYPE
QueryInterface(_COM_Outptr_ Q** pp)
{
return QueryInterface(__uuidof(Q), (void **)pp);
}The class Q template parameter is the type of a COM interface.