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Chapter 5 Script Commands

Scripting Guide 109

FOPEN

Syntax:

FOPEN( $FileName[, %Mode]) ==> %FileHandle

Description:

Opens a file for I/O access.

Action:

FileName is opened for read/write access in the mode defined by the

Mode parameter.

Parameters:

$FileName. String expression. The case sensitive name of the file to

open as a data file. Include any necessary file path.

%Mode. Numeric expression. Optional. The mode in which to open

the file. Valid constants are OVERWRITE, APPEND, and

READONLY. If not specified, the default mode is OVERWRITE.

Mode Constant

OVERWRITE

APPEND

READONLY

Description

FWRITE() always places new entries at the current

record pointer. If the current record pointer is at the

end of the file, no data is overwritten. If the current

record pointer is not at the end of the file, the data at

the current position is overwritten and the data after

the written position is of a questionable state.

FWRITE() always places new entries at the end of the

file, no matter where the current record pointer is. No

data is overwritten.

FOPEN() opens the file in read only mode. No write

operations are allowed to the file.

Returns:

Numeric value, as follows:

Value Meaning

-1 Error occurred while attempting to open

the file.

Any other value A unique number used for subsequent

access to the file in the current script

(commonly referred to as the “file

handle” or the “file number”).

Notes:

1. Refer to Manifest Constants on page 42 for the constants reference

list.

2. The file handle obtained from an FOPEN() call is only valid in the

same script that contains the FOPEN().

3. If the file specified to open does not exist, a new one is created.

4. If the file to be opened already exists, the Mode parameter

determines whether the current data in the file may be

overwritten.

5. The maximum number of files that can be opened per script thread

is 60.

6. FOPEN() can be used to access any file on the MCC unit.

7. Using NFS, it is possible to access virtually any file on any server

or mainframe from the MCC unit.

8. Using FOPEN() on the same file twice in succession returns

different numeric values, but both handles refer to the same file.

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