Wierd USB issues in KAREL

Hi all,

so i'm writing a KAREL program of which part of it logs to a file on USB (UD1) if the user has selected choice to log.

if the user HAS selected choice to log then the USB MUST be inserted for logging - if not the program must abort it's process

so...

OPEN FILE LOG_FILE('AP', fn)fstatus = IO_STATUS(LOG_FILE)

fstatus is always zero whether USB plugged in or not

so it was suggested to me to try opening the file read-only as that gives the correct IO status...

OPEN FILE LOG_FILE('RO',fn)

fstatus = IO_STATUS(LOG_FILE)

fstatus is zero if USB in and file already exists

fstatus is 2014 if USB in and file doeasn't exist yet (FILE-014 File not found)

fstatus is 2014 is USB is not in (FILE-014 File not found)

It seems there’s no difference between..

1. “the file doesn’t exist because usb NOT plugged in” (2014) and
2. “the usb IS plugged in but the file doesn’t exist on it” (2014)

another suggestion was to use

flist : ARRAY[2] OF STRING[40]

FILE_LIST(fn, 0, 3, flist, n_files, fstatus)

but similarly, fstatus is always 0 whether USB is in or not. Hmmmm….

basically all i need is,..

IF USB connected THEN

append log file

ELSE

ABORT

ENDIF

Anyone have any ideas what's going on, or how to solve it?

Any help would be extremey appreciated

Chris

hi PnsStarter,

that's for the reply.

OK, it was not working because i was using roboguide. sim gives 2014 for everything - duh!

on the real robot, the correct status's are set.

but....

OPEN FILE LOG_FILE('AP', fn)

fstatus = IO_STATUS(LOG_FILE)

fstatus is always zero whether USB plugged in or not on sim and robot.

No-one at our Fanuc contacts know why.

OPEN FILE LOG_FILE('RO', fn)

however, does give the correct status though. so this was used in the end (if anyone's insterested)..

OPEN FILE LOG_FILE('RO',fn)

fstatus = IO_STATUS(LOG_FILE)

IF (fstatus = 0) OR (fstatus = 2014) THEN;

       IF (fstatus = 0) THEN;

              -- log file exists..

       ENDIF

       IF (fstatus = 2014) THEN;

              -- log file doesn’t exists..

       ENDIF

       CLOSE FILE LOG_FILE

       OPEN FILE LOG_FILE('AP',fn)

fstatus = IO_STATUS(LOG_FILE)

       IF fstatus = 0 THEN

              -- write log file..

       ENDIF

ELSE

       IF (fstatus = 2068) THEN;

              -- usb not plugged in..

       ENDIF

ENDIF

CLOSE FILE LOG_FILE

Cheers,

Chris