Difference between revisions of "FERROR()"

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==Class==
 
ASCII File Access
 
 
 
 
==Purpose==
 
==Purpose==
 
Function to return the status of the last text-file operation
 
Function to return the status of the last text-file operation
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==Products==
 
==Products==
Recital Database Server, Recital Mirage Server, Recital Terminal Developer
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Recital Server, Recital  
 
[[Category:Documentation]]
 
[[Category:Documentation]]
 
[[Category:Functions]]
 
[[Category:Functions]]
 
[[Category:ASCII File Access]]
 
[[Category:ASCII File Access]]
 
[[Category:ASCII File Access Functions]]
 
[[Category:ASCII File Access Functions]]

Latest revision as of 17:22, 27 November 2009

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(), TEXTEDIT()


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


Products

Recital Server, Recital