Hi



I am trying to work with data that has NULL fields defined and need to
update a file. I am reading the data from a journal entry and can see the
NULL map in the journal entry, the manuals say I need to update the null map
fields before I call the _Rupdate() function, but that?s where things get a
little confusing. The _SET_NULL_MAP_FIELD() macro takes 3 parameters, first
the _RFILE ptr, then a type (I assume this is wher it needs to be ?0? or ?1?
to determine if NULL) plus a field. But it offers no explanation of the
input required? I assume because it is a volatile char *const that this is
an array of characters which needs to be set to ?0? or ?1? according to the
fields in the file?



This is the macro definition



#define _SET_UPDATE_NULL_MAP_FIELD(__file,__type,__field)

(*((__file)->in_null_map + offsetof(__type,__field)) =

__NULL_VALUE)



I cannot find any typedef which relates to the __type or __field element?



I have determined the content of the data and it shows that F9 needs to be
set as a ?1? and F0 to ?0?, but I am not sure how to code up the above macro
to achieve this? I also see the data for the field which is F0 in the null
map is the data to be changed so I know the _Rupdate() function should take
the NULL map and set the data accordingly but not sure how to implement?
This is only part of the problem, but once I get the null map set I am sure
the rest will make sense.



Any advice will be gladly accepted.



Chris?



Chris Hird

Director

Shield Advanced Solutions Ltd

http://www.shieldadvanced.ca

1(519) 940-1192

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