| Re: IDL Save file query routine [message #24837] |
Thu, 26 April 2001 10:44 |
Craig Markwardt
Messages: 1869
Registered: November 1996
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Senior Member |
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Jonathan Joseph <jj21@cornell.edu> writes:
> IDL (I'm still using 5.3) has nice query routines to let you know if the
> image read operation you are about to perform is likely to work.
>
> Is there any way to query an IDL save file?
> I want to idiot-proof a program which will restore
> a save file that a user selects, but if the program tries
> to restore file which is not an IDL save file, it will halt.
>
> Is there a way to test?
I don't think there is a standard way to do what you want. There are
a couple of other possibilities.
One is to use a CATCH handler to catch any errors that occur upon
restoring. For example:
catch, catcherr
if catcherr EQ 0 then begin
restore, 'filename.sav'
endif else begin
catch, /cancel
message, 'This is not a SAVE file'
endif
catch, /cancel
...
You can and should do a lot of additional checking to be sure the
right variables were restored.
A second option is to use my CMSV SAVE library, which is designed for
exactly this purpose. You can use CMSAVEDIR to query not only for a
valid SAVE file, but also to inquire about the names of variables.
When it's time to actually restore the variables there are a lot of
useful programming options as well, using CMRESTORE.
http://cow.physics.wisc.edu/~craigm/idl/idl.html (under SAVE files)
Craig
--
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Craig B. Markwardt, Ph.D. EMAIL: craigmnet@cow.physics.wisc.edu
Astrophysics, IDL, Finance, Derivatives | Remove "net" for better response
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