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IUnknown::QueryInterface
The QueryInterface method determines if an interface can be used with an object. Used by the
following interfaces: IAVIEditStream, IAVIFile, IAVIStream, IAVIStreaming, and IGetFrame.
HRESULT QueryInterface(
LPUNKNOWN ps,
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| const IID & riid,
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| void *ppvObj
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| );
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Parameters
ps
Address of an IAVIEditStream, IAVIFile, IAVIStream, IAVIStreaming, or IGetFrame interface.
riid
Identifier of the interface being queried.
ppvObj
Address to contain a pointer to the object whose interface is queried or NULL
when an interface is not supported.
Return Values
Returns a pointer to the current interface if successful or E_NOINTERFACE
otherwise.
Remarks
For handlers written in C++, QueryInterface has the following syntax:
HRESULT QueryInterface(const IID &riid, void *ppvObj);
See Also
IAVIEditStream, IAVIFile, IAVIStream, IAVIStreaming, IGetFrame
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