Difference between revisions of "FOPEN()"

From Recital Documentation Wiki
Jump to: navigation, search
Line 1: Line 1:
 +
==Class==
 +
ASCII File Access
 +
 +
 
==Purpose==
 
==Purpose==
 
Function to open an existing ASCII text file
 
Function to open an existing ASCII text file

Revision as of 14:46, 23 March 2009

Class

ASCII File Access


Purpose

Function to open an existing ASCII text file


Syntax

FOPEN(<expC> [,expN>])


See Also

FCREATE(), FCLOSE(), FERROR(), FREADSTR(), FWRITE(), MEMOREAD(), MEMOWRITE(), TEXTEDIT()


Description

The FOPEN() function opens an existing ASCII text file. It returns a numeric file pointer when the file is opened successfully, or a -1 if unsuccessful. The <expC> is the name of the ASCII file to open. Since the file pointer is required to identify an open file to other file functions, always assign the return value to a memory variable. The optional <expN> determines the file access mode:


<expN> Access Mode
If not specified, read-only
0 Read-only
1 Write only. Existing contents are deleted.
2 Append. Text may be added to the end of the existing contents.


If an error occurs, -1 is returned by the FERROR() function. The FCLOSE() function is used to close a file which has been opened with FOPEN().


Example

use accounts
fp=fopen("existing.file")
if ferror()=-1
    dialog box "The file could not be opened."
else
    string = fgets(fp,)
    do while not empty(string)
        ? string
        string = fgets(fp)
    enddo
    ?
endif
fclose(fp)
if ferror()=-1
    dialog box "The file could not be closed."
endif


Products

Recital Database Server, Recital Mirage Server, Recital Terminal Developer