WILLTEK 4403 - Commands for Input;Output Handling; Close; Input

Chapter 6 RAPID!
Commands
178 WCDMA Options Version 6.20
Commands for input/
output handling
These commands enable special input/output tasks related to the 4400’s disk
drive, hard disk and communication ports.
Frequently, input/output operations are abbreviated with I/O.
CLOSE
INPUT
Command Short description
CLOSE Closes a previously opened file.
INPUT Reads data from an open file or from an open port.
OPEN Opens a file or a port and allows for reading or writing
data.
PRINT or
OUTPUT
Writes data to an open file or port.
Syntax
CLOSE [fileNo]
Parameters
fileNo is a numeric expression, representing a valid file
number.
fileNo must result in a positive integer.
Software people tend to call
fileNo the ‘file handle’.
Description
Closes the file with the specified
fileNo.
After the file has been closed,
fileNo is no longer
related to the initial file and may be used again later to
open a completely different file.
If
fileNo is omitted, then all currently open files will be
closed.
As long as a file is closed, it is not accessible for I/O oper-
ations unless it is opened again, using the
OPEN com-
mand (please see below for details).
Example
The following example program reads a text file and
stores the data read from the file in a string array.
LET i=0
OPEN "STRINGS.TXT" FOR INPUT AS #1
DO WHILE NOT EOF(1)
LET i=i+1
INPUT #1, theStrgs$(i)
LOOP
CLOSE #1
Syntax
INPUT #fileNo , variable
Parameters
fileNo is a numeric expression resulting in a valid file
handle (a positive integer).
variable is a numeric or string variable.