OpenEuphoria

Re: EU bug??

• Posted by Robert Craig <rds at RapidEuphoria.com> Aug 06, 2003
• 407 views

George Walters wrote:
> If you happen to try and open a print file twice, both with the same file
> name, EU can't produce an error file. I made that mistake and it took a long
> time to find it.... since it occurred after many many reads and writes...
> here's the code. I accidently set pageNbr back to zero. You know, thinking
> about this, I opened it again for each customer I ran into and it quit in
> the H's, so I have no idea what it was doing. HOW could it open the same
> output file so may times?? Does it make sense to open the same sequential
> file for output multiple times?

Euphoria does not try to stop you from opening
the same file or device two or more times.
I don't know of any language that does.
You'll get a new file number (handle) for each open().
It might make some sense if you are reading
two logically different files, that just happen
to be the same file in a particular case, but
in general it's probably not a good idea.
I/O buffering will cause erratic results
if you are writing via two different handles.

Also keep in mind that Euphoria sets a limit of 25
simultaneously open files. This is
mainly to catch errors where you are in a loop,
opening, but never closing files.
Without Euphoria's limit the O/S would eventually
stop you, but the error wouldn't be very clear.

Regards,
    Rob Craig
    Rapid Deployment Software
    http://www.RapidEuphoria.com