how to use struct column_info?

["??????????" <237825552 () qq com>]

I wonder how to use struct column_info to display the packet,what is the relationship between column_info with 
packet_list?


the following is the definition of struct column_info :
/** Column info */
typedef struct _column_info {
  gint                num_cols;             /**< Number of columns */
  gint               *col_fmt;              /**< Format of column */
  gboolean          **fmt_matx;             /**< Specifies which formats apply to a column */
  gint               *col_first;            /**< First column number with a given format */
  gint               *col_last;             /**< Last column number with a given format */
  gchar             **col_title;            /**< Column titles */
  gchar             **col_custom_field;     /**< Custom column field */
  gint               *col_custom_occurrence;/**< Custom column field occurrence */
  gint               *col_custom_field_id;  /**< Custom column field id */
  struct _dfilter_t **col_custom_dfilter;   /**< Compiled custom column field */
  const gchar       **col_data;             /**< Column data */
  gchar             **col_buf;              /**< Buffer into which to copy data for column */
  int                *col_fence;            /**< Stuff in column buffer before this index is immutable */
  col_expr_t          col_expr;             /**< Column expressions and values */
  gboolean            writable;             /**< writable or not @todo Are we still writing to the columns? */
  gboolean            columns_changed;      /**< Have the columns been changed in the prefs? */
} column_info;

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