Programmer's Reference Manual Intermec Fingerprint® v8.70.0 ...

Chapter —Program Instructions
LOF
Purpose Function returning the length in bytes of an OPEN sequential or random
file, or returning the status of the buffers in an OPEN communication
channel.
Syntax LOF()
() is the number assigned to the file or communication channel
when it was OPENed.
Remarks LOF can also be used to check the receive or transmit buffer of the specified
communication channel:
• If a channel is OPENed for INPUT, the remaining free space (bytes) in
the receive buffer is returned.
• If a channel is OPENed for OUTPUT, the remaining number of characters
to be transmitted from the transmit buffer is returned.
Examples The first example illustrates how the length of the file "Pricelist" is
returned:
10 OPEN "PRICELIST" AS #5
20 A%=LOF(5)
30 PRINT A%
. . . .
. . . .
The second example shows how the number of free bytes in the receive
buffer of communication channel "uart2:" is calculated:
100 OPEN "uart2:" FOR INPUT AS #2
110 A%=LOF(2)
120 PRINT A%
1 0 Intermec Fingerprint v8.70.0/v10.0.0 Programmer´s Reference Manual