OPER Read operand value from transfer area

The OPER function reads the value of an operand at a certain position from the standardized transfer area. The OPER call must be preceded by a TYPE or STRU call defining the operand type and operand length.

Call

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CALL SDF('OPER',area,error,pos,val,lng[,lst])

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Description of the parameter list

Parameter	Data type (length)	Input/ output	Meaning
OPER	char(4)	in	Function name: keyword OPER
area	char()	in	Buffer in which the standardized transfer area was stored (see INIT)
error	integer	out	Return code
pos	integer	in	Position of the operand
val	char(lng)	inout	Address of a string in which the value is to be stored
lng	integer	in	Length of the val string must be greater than or equal to the value returned by TYPE or STRU for the lng parameter
lst	integer	in	Relevant only if the operand is an element in a list: position of the operand in the list

If the OPER function is called for an operand of the type STRUCTURE, it returns

the value of the operand introducing the structure, whose length and type were analyzed beforehand by the STRU function.