cancel checkInvariant close dump elementNameParse extensionsAdd extensionsCount extensionsLookupPrefix extensionsLookupUri extensionsPrefix extensionsUri fileName ImageFile isElementNameExtended isOpen isWritable operator!= operator== readerCount root writerCount

ustring extensionsPrefix ( const size_t  index ) const Get an E57 extension prefix declared in an ImageFile by index. Parameters: [in] index The index of the prefix to get, starting at 0. The order that the prefixes are stored in is not necessarily the same as the order they were created. However the prefix order will correspond to the URI order. The default E57 namespace is not counted as an extension. Precondition: This ImageFile must be open (i.e. isOpen()). 0 <= index < extensionsCount() Postcondition: No visible state is modified. Returns: The E57 extension prefix at the given index. Exceptions: E57_ERROR_BAD_API_ARGUMENT E57_ERROR_IMAGEFILE_NOT_OPEN E57_ERROR_INTERNAL All objects in undocumented state See also: Extensions.cpp example, ImageFile::extensionsCount, ImageFile::extensionsUri