>I have a grid class (modify from TASTRADE) that calculates Sum of a column but it gives me GPF. If I take out the 'CALCULATE' statement, everything works fine. Is this a Microsoft bug or not?
>
>My CalExpr is: SUM(carddet_vw.qty*carddet_vw.price)
>
>
>LOCAL i,lnOldArea, ;
> lnOldRecNo, ;
> luKey, ;
> lcOrder,;
> lnResult,;
> lcExpression
>
>lnResult = 0.00
>IF EMPTY(THIS.CalExpr)
> return lnResult
>ELSE
> IF EMPTY(this.RecordSource)
> RETURN lnResult
> ENDIF
>
> lcExpression= " " + THIS.CalExpr + " "
> lnOldArea = SELECT()
> SELECT (this.RecordSource)
> lnOldRecNo = IIF(EOF(), 0, RECNO())
> lcOrder = ORDER()
> luKey = IIF(!EMPTY(lcOrder), EVAL(lcOrder), "")
>
> IF !EMPTY(lcOrder) AND SEEK(luKey)
> calculate &lcExpression;
> WHILE luKey = EVAL(lcOrder) ;
> TO lnResult
> ELSE
> CALCULATE &lcExpression;
> TO lnResult
> ENDIF
>
> IF lnOldRecNo <> 0
> GO lnOldRecNo
> ENDIF
> SELECT (lnOldArea)
>ENDIF
>
>return lnResult

I think it's safer to 'calculate' using SELECT-SQL. Here, you wouldn't worry about work areas, pointers, etc.