Difference between revisions of "FOPEN()"

Revision as of 11:50, 1 December 2009

Purpose

Function to open an existing ASCII text file

Syntax

FOPEN(<expC> [,expN>])

See Also

FCREATE(), FCLOSE(), FEOF(), FERROR(), FFLUSH(), FGETS(), FPUTS(), FREAD(), FREADSTR(), FSEEK(), 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:

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, Recital Server