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(

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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