Specifications

353
Syntax:
EOF([#]filenumber)
Parameter:
filenumber
A numeric expression which returns a value from 1 to 16.
Description:
EOF tests for an end of a device I/O file designated by filenumber. Then it
returns -1 (true) if no data remains; it returns 0 (false) if any data remains, as listed
below.
• filenumber should be the file number of an opened device file.
• The
EOF function cannot be used for data files. Specifying a data file number for
filenumber causes a run-time error.
End Of File File I/O function
EOF
Tests whether the end of a device I/O file has been reached.
File Type Returned Value End-of-file Condition
Communications device file -1 (true) No data remains in the
receive buffer.
0 (false) Any data remains in the
receive buffer.
Barcode device file -1 (true) No data remains in the
barcode buffer
0 (false) Any data remains in the
barcode buffer.