- Query an extended version of the ICamera-derived class
- Support version compatibility
int ICAMERA_QueryInterface ( ICamera * pICamera, AEECLSID clsReq, void ** ppo )
- SUCCESS: Successful. Synchronous operation completed. Otherwise: an error code.
- If an interface is retrieved, then this function increments its reference count.
If a data structure is retrieved, then a pointer to the internal structure is given and user should not free it.