dbfaddfield dbffileisnull dbfgetfieldindex dbfgetfieldinfo dbfgetnativefieldtype dbfisattributenull ftdouble ftinteger ftinvalid ftlogical ftstring shpclose shpcomputeextents shpcreate shpcreateobject shpcreatesimpleobject shpdestroyobject shpfileisnull shpgetinfo shpisnull shpopen shpreadobject shpt_arc shpt_arcm shpt_arcz shpt_multipatch shpt_multipoint shpt_multipointm shpt_multipointz shpt_null shpt_point shpt_pointm shpt_pointz shpt_polygon shpt_polygonm shpt_polygonz shpwriteobject

logical function, public shapelib::dbfisattributenull ( type(shpfileobject), intent(inout)  hshp, integer, intent(in)  ishape, integer, intent(in)  ifield  ) It returns .TRUE. if the requested attribute is NULL valued. Note that NULL fields are represented in the .dbf file as having all spaces in the field. Reading NULL fields will result in a value of 0.0 or an empty string with the dbfreadattribute interface. It returns .TRUE. in case of error as well. This procedure is available only with shapelib version 1.2.10 or later. Parameters [in,out] hshp shapefile object to query [in] ishape number of shape (record) to query [in] ifield number of field to query Definition at line 826 of file shapelib.F90.