Programming instructions

Intermec Fingerprint v7.61 – Programmer’s Reference Manual Ed. 7 77
Chapter 2 Program Instructions
ERL
Field of Application Function returning the number of the line on which an error condition
has occurred.
Syntax ERL
Remarks
Also useful in connection with an ON ERROR GOTO statement.
Examples You can check at which line the last error since power up occurred
like this:
PRINT ERL
yields for example
40
In this example, the line number of the line, where an error has occurred,
decides the action to be taken (in this case the font size is too large
for the label width):
10 ON ERROR GOTO 1000
20 FONT "Swiss 721 BT",100
30 PRTXT "HELLO EVERYBODY"
40 PRINTFEED
50 END
1000 IF ERL=40 THEN PRINT "PRINT ERROR"
1010 RESUME NEXT
RUN
yields:
PRINT ERROR
You can use the ERL function in programs without line numbers too,
because such programs have automatically generated hidden line numbers
that are revealed when the program is LISTed (see Intermec Fingerprint
7.50, Programmer’s Guide). This is the same program as above but
without line numbers:
NEW
IMMEDIATE OFF
ON ERROR GOTO QAAA
FONT "Swiss 721 BT",100
PRTXT "HELLO EVERYBODY"
PRINTFEED
END
QAAA: IF ERL=40 THEN PRINT "PRINT ERROR"
RESUME NEXT
IMMEDIATE ON
RUN
yields:
PRINT ERROR