Posted by Jeff Cinelli on December 09, 2008 at 06:52:59:
It would be helpful to have a functino that we could use in a subroutine, or an include file, that would return an available lun. For example, we have an include file thats used in the executable sectino of many programs. If i'd like to update a log file when a change is made, I'd like that routine to be able to safely open a lun without clobbering something that was open in the main program. I know I could do a loop and just try opening the file on every lun with an exception, but it would be handy to do it clean.
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LUN=(FNLUNNEXT,ERR)
IF ERR NE 0 MSGBOX('No Lun Available')
IF ERR EQ 0 OPEN (LUN) FILE$
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or
LUN=FNLUNNEXT
IF LUN NE 0 OPEN (LUN) FILE$
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.
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