def tag_present
      ptr = ::FFI::MemoryPointer.new(:int)
      Klass.getTagStatus(@handle, ptr)
      (ptr.get_int(0) == 0) ? false : true
    end
def tag_present
      ptr = ::FFI::MemoryPointer.new(:int)
      Klass.getTagStatus(@handle, ptr)
      (ptr.get_int(0) == 0) ? false : true
    end
Returns the value indicating whether or not a tag is on the reader.

 @return [Boolean] returns a value indicating whether or not a tag is on the reader, or raises an error