| Re: calling a user-named procedure [message #7782 is a reply to message #7773] |
Wed, 15 January 1997 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Eddie Haskell <haskell@ccpo.odu.edu> writes:
> i would like to be able to call a procedure whose name is
> given by the user during execution.
> i have tried different syntaxes of execute and call_procedure but to no avail.
> either i am just not phrasing things correctly, or i am on the wrong track.
> does anyone know if this can be done, and if so, how?
Here is an example that works.
********************************************************
PRO STUFF, filename, numLines
; Open the file, read and print the specified number of lines.
OPENR, lun, filename, /GET_LUN
fileInfo = STRARR(numLines)
READF, lun, fileInfo
FREE_LUN, lun
PRINT,fileInfo
END ;----------------------------------------------------------
PRO ASK_FOR_STUFF
procedureName = ""
READ, procedureName, PROMPT='Enter name of procedure to call: '
filename = ""
READ, filename, PROMPT='Enter name of file to execute procedure on: '
CALL_PROCEDURE, procedureName, filename, 5
END ;----------------------------------------------------------
********************************************************
I run it like this:
IDL> ASK_FOR_STUFF
Enter name of procedure to call: stuff
Enter name of file to execute procedure on: junk.pro
PRO JUNK, color
IF MAX(number) GT 255 OR MIN(number) LT 0 THEN $
MESSAGE, 'Argument values must be in range of 0-255'
base16 = [[1L, 16L], [256L, 4096L], [65536L, 1048576L]]
I think from your example, you may have been confused about
whether you wanted the name of the procedure as a string (which
is what CALL_PROCEDURE wants) or the name of the file. I have
shown both in this example so you can see the difference.
Hope this sets you right.
David
-----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
2642 Bradbury Court, Fort Collins, CO 80521
Phone: 970-221-0438 Fax: 970-221-4762
E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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