How to use the nfstream.ndpi_bindings.ndpi.ndpi_get_proto_name function in nfstream

NFStreamClassifier.on_flow_terminate(self, flow)
        if flow.classifiers[self.name]['detected_protocol'].app_protocol == 0 and \
                flow.classifiers[self.name]['guessed'] == 0:  # didn't reach max and still unknown, so give up!
            flow.classifiers[self.name]['detected_protocol'] = ndpi.ndpi_detection_giveup(
                self.mod,
                byref(flow.classifiers[self.name]['ndpi_flow']),
                1,
                cast(addressof(c_uint8(0)), POINTER(c_uint8))
            )
            flow.classifiers[self.name]['guessed'] = 1

        master_name = self.str(
            ndpi.ndpi_get_proto_name(self.mod, flow.classifiers[self.name]['detected_protocol'].master_protocol)
        )
        app_name = self.str(
            ndpi.ndpi_get_proto_name(self.mod, flow.classifiers[self.name]['detected_protocol'].app_protocol)
        )
        category_name = self.str(
            ndpi.ndpi_category_get_name(self.mod, flow.classifiers[self.name]['detected_protocol'].category)
        )

        flow.classifiers[self.name]['application_name'] = master_name + '.' + app_name
        flow.classifiers[self.name]['category_name'] = category_name
        flow.classifiers[self.name]['app_id'] = flow.classifiers[self.name]['detected_protocol'].app_protocol
        flow.classifiers[self.name]['master_id'] = flow.classifiers[self.name]['detected_protocol'].master_protocol
        # Now we do move some values to flow.metrics just to print purpose. If you are implementing your magic
        # classifier, just do flow.classifiers['name_of_your_classifier]['name_of_your_feature']
        # if we move it before, it will trigger metrics callback.
        flow.metrics['application_name'] = flow.classifiers[self.name]['application_name']
        flow.metrics['category_name'] = flow.classifiers[self.name]['category_name']
        flow.metrics['http_dns_server_name'] = self.str(
            flow.classifiers[self.name]['ndpi_flow'].host_server_name

def on_flow_terminate(self, flow):
        NFStreamClassifier.on_flow_terminate(self, flow)
        if flow.classifiers[self.name]['detected_protocol'].app_protocol == 0 and \
                flow.classifiers[self.name]['guessed'] == 0:  # didn't reach max and still unknown, so give up!
            flow.classifiers[self.name]['detected_protocol'] = ndpi.ndpi_detection_giveup(
                self.mod,
                byref(flow.classifiers[self.name]['ndpi_flow']),
                1,
                cast(addressof(c_uint8(0)), POINTER(c_uint8))
            )
            flow.classifiers[self.name]['guessed'] = 1

        master_name = self.str(
            ndpi.ndpi_get_proto_name(self.mod, flow.classifiers[self.name]['detected_protocol'].master_protocol)
        )
        app_name = self.str(
            ndpi.ndpi_get_proto_name(self.mod, flow.classifiers[self.name]['detected_protocol'].app_protocol)
        )
        category_name = self.str(
            ndpi.ndpi_category_get_name(self.mod, flow.classifiers[self.name]['detected_protocol'].category)
        )

        flow.classifiers[self.name]['application_name'] = master_name + '.' + app_name
        flow.classifiers[self.name]['category_name'] = category_name
        flow.classifiers[self.name]['app_id'] = flow.classifiers[self.name]['detected_protocol'].app_protocol
        flow.classifiers[self.name]['master_id'] = flow.classifiers[self.name]['detected_protocol'].master_protocol
        # Now we do move some values to flow.metrics just to print purpose. If you are implementing your magic
        # classifier, just do flow.classifiers['name_of_your_classifier]['name_of_your_feature']
        # if we move it before, it will trigger metrics callback.
        flow.metrics['application_name'] = flow.classifiers[self.name]['application_name']