Re: Catch problem

[Ben Tupper <btupper(at)bigelow.org>]

Howdy,

I have done this all too frequently,  Add ...

    CATCH, /CANCEL

inside the if statement block so that the Error_Status value reverts to 0
(zero) before exiting the block.  Error catching seems like big brother
watching to me... unlike the most of the procedures I know (maybe with the
exception of XMANAGER) where the action  is history once the command is
given, CATCH keeps right on catching.

Ben



ALAN FRAZIER wrote:

> Recently, I started learning the catch procedure to help with some error
> checking.  I typed the code word-for-word out of the IDL 5.3
> documentation:
>
> PRO ABC
>
>         A = fltarr(10)
>
>         CATCH, Error_status
>
>         IF Error_status NE O THEN BEGIN
>                 PRINT, 'ERROR INDEX: ', Error_Status
>                 PRINT, 'ERROR MESSAGE: ', !ERR_STRING
>                 A = FLTARR(12)
>                 ENDIF
>
>         A[11] = 12
>
>         HELP, A
>
> END
>
> to help me learn this command.  However, this code does not seem to
> execute correctly.  As far as I can tell, the code causes some sort of
> infinite loop on the if statement.  Any ideas what I am doing wrong?  I am
> using IDL 5.4 on a Mac.
>
> --
> Alan

--
Ben Tupper
Bigelow Laboratory for Ocean Sciences
180 McKown Point Rd.
W. Boothbay Harbor, ME 04575
btupper@bigelow.org