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Merge pull request MicrosoftDocs#2572 from MicrosoftDocs/FromPublicMasterBranch
Confirm merge from FromPublicMasterBranch to master to sync with https://github.com/MicrosoftDocs/cpp-docs (branch master)
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‎docs/atl/iunknown.md‎

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# IUnknown
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[IUnknown](/windows/win32/api/unknwn/nn-unknwn-iunknown) is the base interface of every other COM interface. This interface defines three methods: [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q_)), [AddRef](/windows/win32/api/unknwn/nf-unknwn-iunknown-addref), and [Release](/windows/win32/api/unknwn/nf-unknwn-iunknown-release). [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q_)) allows an interface user to ask the object for a pointer to another of its interfaces. [AddRef](/windows/win32/api/unknwn/nf-unknwn-iunknown-addref) and [Release](/windows/win32/api/unknwn/nf-unknwn-iunknown-release) implement reference counting on the interface.
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[IUnknown](/windows/win32/api/unknwn/nn-unknwn-iunknown) is the base interface of every other COM interface. This interface defines three methods: [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q)), [AddRef](/windows/win32/api/unknwn/nf-unknwn-iunknown-addref), and [Release](/windows/win32/api/unknwn/nf-unknwn-iunknown-release). [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q)) allows an interface user to ask the object for a pointer to another of its interfaces. [AddRef](/windows/win32/api/unknwn/nf-unknwn-iunknown-addref) and [Release](/windows/win32/api/unknwn/nf-unknwn-iunknown-release) implement reference counting on the interface.
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## See also
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‎docs/atl/queryinterface.md‎

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# QueryInterface
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Although there are mechanisms by which an object can express the functionality it provides statically (before it is instantiated), the fundamental COM mechanism is to use the `IUnknown` method called [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q_)).
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Although there are mechanisms by which an object can express the functionality it provides statically (before it is instantiated), the fundamental COM mechanism is to use the `IUnknown` method called [QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q)).
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Every interface is derived from `IUnknown`, so every interface has an implementation of `QueryInterface`. Regardless of implementation, this method queries an object using the IID of the interface to which the caller wants a pointer. If the object supports that interface, `QueryInterface` retrieves a pointer to the interface, while also calling `AddRef`. Otherwise, it returns the E_NOINTERFACE error code.
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‎docs/atl/reference/ccomptrbase-class.md‎

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### Remarks
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This method calls [IUnknown::QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q_)).
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This method calls [IUnknown::QueryInterface](/windows/win32/api/unknwn/nf-unknwn-iunknown-queryinterface(q)).
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In debug builds, an assertion error will occur if *pp* is not equal to NULL.
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