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Can I cast a pointer to a DirectX interface to a lower version number?

April 26, 2017Cast DirectX interface lower pointer version

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Can I cast a pointer to a DirectX interface to a lower version number?

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No. DirectX interfaces are COM interfaces. This means that there is no requirement for higher numbered interfaces to be derived from corresponding lower numbered ones. Therefore, the only safe way to obtain a different interface to a DirectX object is to use the QueryInterface method of the interface. This method is part of the standard IUnknown interface, from which all COM interfaces must derive.