Carl,
Sorry to take so long to respond. I had to stop and take care of some
other pressing responsibilities. Anyway, many thanks. You solved my
problem and also showed me how to test without having to access the
internet. As is usually the case with rebol, the solution turned to be so
simple. I was pleased to see that I almost had it right; at least I knew
to use try. Slowly but surely, I'm learning and becoming more productive.
Thanks again!
Louis
At 11:19 PM 3/13/2002 +1200, you wrote:
>On 13-Mar-02, Dr. Louis A. Turk wrote:
>
> > Hi rebols,
>
> > How do I stop an error from stopping my program? I am sending a file
> > to a remote server every 10 minutes to update data. When there is
> > too much traffic on the net or the remote server is too slow
> > receiving the file, an error occurs which results in my program
> > dying. I want it to keep trying until it succeeds no matter how long
> > that takes. Here is what I have tried, but it doesn't seem to work
> > (that is, errors still stop the program):
>
> > until [not error? try [write web-address read page-url] [prin {ftp
> > failed: trying again ... }]]
>
>Hi Louis,
>
>Your problem is there's no 'if in the above so the second block isn't
>evaluated, yet it is returned to 'until for checking if it's true or
>false. Here's a simplier version which shows what's happening
>without the need to access a website...
>
> >> until [not error? try [1 / 0][prin "Error"]]
>== [prin "Error"]
>
>This is detecting the error but just shrugging its shoulders about it
>and moving on to what's next - which is the block. (Sorry - it's
>late:)
>
>I found it simpliest to use 'either to get it working...
>
> >> until [either error? try [1 / 0][print "Error" false][true]]
>Error
>Error
>Error
>Error
>(escape)
>
> >> until [either error? try [1 / 1][prin "Error" false][true]]
>== true
>
>HTH.
>
>--
>Carl Read
>
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