ABAP内表获取fieldcat

try.
        cl_salv_table=>factory( importing
                                  r_salv_table   = data(salv_table)
                                changing
                                  t_table        = <table>  ).
                                  
        rt_fcat = cl_salv_controller_metadata=>get_lvc_fieldcatalog(
            r_columns      = salv_table->get_columns( ) 
            r_aggregations = salv_table->get_aggregations( ) )." ALV Aggregations
      catch cx_root.
    endtry.