Programming instructions

Intermec Fingerprint v7.61 – Programmer’s Reference Manual Ed. 782
Chapter 2 Program Instructions
FIELD
Field of Application Statement for creating a single-record buffer for a random file
and dividing the buffer into fi elds to which string variables are
assigned.
Syntax FIELD[#]<nexp
1
>,<nexp
2
>AS<svar
1
>[,<nexp
3
>AS<svar
2
>...]
# indicates that whatever follows is a number. Optional.
<nexp
1
> is the number assigned to the fi le when it was OPENed.
<nexp
2-n
> is the number of bytes to be reserved for the string variable
that follows. (Null not allowed.)
<svar
1-n
> is the designation of the string variable, for which space
has been reserved.
Remarks The buffer is divided into fi elds, each of which is given an individual length
in bytes. A string variable is assigned to each fi eld. This statement does not
put any data in the buffer, it only creates and formats the buffer, allowing you
to place the data using LSET and RSET statements.
Before using this statement, consider the maximum number of characters
(incl. space characters) needed for each variable and check that the
total does not exceed the record size given when the fi le was OPENed
(by default 128 bytes).
When a fi le is CLOSEd, all its FIELD defi nitions will be lost.
Example This example opens and formats a fi le buffer for a single record. The
buffer is divided into three fi elds, with the size of 25, 30, and 20 bytes
respectively.
10 OPEN "ADDRESSES" AS #8 LEN=75
20 FIELD#8,25 AS F1$, 30 AS F2$, 20 AS F3$
(Imagine a spreadsheet matrix where the fi le is the complete spreadsheet,
the records are the lines and the fi elds are the columns. The buffer can only
contain one such line at the time.)