e class="structname">PGresult</code> object bearing
   a status code of <code class="literal">PGRES_COPY_OUT</code> or
   <code class="literal">PGRES_COPY_IN</code> (depending on the specified copy
   direction).  The application should then use the functions of this
   section to receive or transmit data rows.  When the data transfer is
   complete, another <code class="structname">PGresult</code> object is returned to indicate
   success or failure of the transfer.  Its status will be
   <code class="lite