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FERROR()
Test for errors after a binary file operation
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Syntax
FERROR() --> nErrorCode
Returns
FERROR() returns the DOS error from the last file operation as an
integer numeric value. If there is no error, FERROR() returns zero.
FERROR() Return Values
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Error Meaning
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0 Successful
2 File not found
3 Path not found
4 Too many files open
5 Access denied
6 Invalid handle
8 Insufficient memory
15 Invalid drive specified
19 Attempted to write to a write-protected disk
21 Drive not ready
23 Data CRC error
29 Write fault
30 Read fault
32 Sharing violation
33 Lock Violation
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Description
FERROR() is a low-level file function that indicates a DOS error after a
file function is used. These functions include FCLOSE(), FCREATE(),
FERASE(), FOPEN(), FREAD(), FREADSTR(), and FRENAME(). FERROR() retains
its value until the next execution of a file function.
Warning! This function allows low-level access to DOS files and
devices. It should be used with extreme care and requires a thorough
knowledge of the operating system.
Examples
. This example tests FERROR() after the creation of a binary
file and displays an error message if the create fails:
#include "Fileio.ch"
//
nHandle := FCREATE("Temp.txt", FC_NORMAL)
IF FERROR() != 0
? "Cannot create file, DOS error ", FERROR()
ENDIF