Difference between revisions of "FERROR()"

Revision as of 06:36, 10 February 2012

Purpose

Function to return the status of the last text-file operation

Syntax

FERROR()

See Also

FCLOSE(), FCREATE(), FGETS(), FOPEN(), FPUTS(), FREADSTR(), FWRITE(), MEMOREAD(), MEMOWRITE()

Description

The FERROR() function returns an integer representing the status of the last text file operation. It returns –1 for failure, 0 for success. This function should always be used in conjunction with the other text file functions to check for errors.

Example

use accounts
fp=fopen("existing.file")
if ferror()=-1
    dialog box "The file could not be opened."
else
    string = freadstr(fp,80)
    do while not empty(string)
        ? string
        string = freadstr(fp,80)
    enddo
    ?
    fclose(fp)
    if ferror()=-1
        dialog box "The file could not be closed."
    endif
endif