I am currently using tvb_set_child_real_data_tvbuff(). The issue is that get_field_data() in print.c iterates through the list of data sources to get the bytes referred to by a field_info. I don't believe that removing the g_assert_not_reached() will have any negative side effects. It will simply mean that no bytes are printed if the tvb has not been added via add_new_data_source(). But I am not that familiar with the source code so I could be wrong. James.
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