| Catched in a catch loop [message #94799] |
Wed, 18 October 2017 06:48  |
LNpellen
Messages: 37
Registered: November 2009
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Member |
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I'm not used to CATCH - I strive to write the code robust enough to not cause errors. No I need it and seem to not understand how.
Using RESTORE with a not valid save file causes
% RESTORE: Not a valid save file:
So I try with this catch, but the error occurs even though I get the dialog With the error-message I wrote (looping until I have to crash the program).
What have I misunderstood?
CATCH, err_stat
IF err_stat NE 0 THEN BEGIN
CATCH, /CANCEL
sv=DIALOG_MESSAGE('Not valid .sav file: '+adr, /INFORMATION)
ENDIF
RESTORE, adr
-Ellen
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| Re: Catched in a catch loop [message #94801 is a reply to message #94799] |
Wed, 18 October 2017 07:21  |
Markus Schmassmann
Messages: 129
Registered: April 2016
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Senior Member |
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On 10/18/2017 03:48 PM, LNpellen wrote:
> I'm not used to CATCH - I strive to write the code robust enough to
> not cause errors. No I need it and seem to not understand how.
>
> Using RESTORE with a not valid save file causes
> % RESTORE: Not a valid save file:
>
> So I try with this catch, but the error occurs even though I get the
> dialog With the error-message I wrote (looping until I have to crash
> the program).
>
> What have I misunderstood?
>
>
> CATCH, err_stat
> IF err_stat NE 0 THEN BEGIN
> CATCH, /CANCEL
> sv=DIALOG_MESSAGE('Not valid .sav file: '+adr, /INFORMATION)
> ENDIF
> RESTORE, adr
after pressing OK in the dialog window, the process continues, i.e. it
tries again to run
RESTORE, adr
therefore after the line
sv=DIALOG_MESSAGE('Not valid .sav file: '+adr, /INFORMATION)
you have to either do something to fix adr to a correct filename, or
you have to abort the process, e.g. by a RETURN
alternatively you can replace the DIALOG_MESSAGE function by
message, 'Not valid .sav file: '+adr
in which case the program would stop at this line and the user could
enter a correct filename by entering at the console
IDL> adr='filename.sav'
IDL> .c
another possibility,
adr = DIALOG_PICKFILE(filter='*.sav',/must_exist,title='Not valid .sav
file: '+adr)
if adr eq '' then begin message, 'no file selected' & return & endif
I hope one of these is what you are looking for, Markus
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| Re: Catched in a catch loop [message #94806 is a reply to message #94801] |
Wed, 18 October 2017 22:21 |
LNpellen
Messages: 37
Registered: November 2009
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Member |
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Thank you! First I got a compilation error with the RETURN as it is within a function, but when I made it RETURN, -1 it worked out.
CATCH, err_stat
IF err_stat NE 0 THEN BEGIN
CATCH, /CANCEL
sv=DIALOG_MESSAGE('Not valid .sav file: '+adr, /INFORMATION)
RETURN, -1
ENDIF
RESTORE, adr
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