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reading multiple tape files [message #624]

Wed, 23 December 1992 20:31

ljg
Messages: 5
Registered: January 1993

Junior Member

Can anyone suggest a good way of reading multiple files from a tape
device in (Unix) IDL? EOF() doesn't work with a tape file. I can
do something like:

openr,1,'/dev/nrst0'

while more_files_on_tape do begin

!error=0
on_ioerror, done

while (1) do begin
readu,1,buf
; . . . process data ...
endwhile

done:

if !error then print, !err_string
!error = 0
on_ioerror, null

endwhile

This will work to read a single file at a time, but the on_ioerror
immediately jumps to "done" on any attempt to read more than one file.
Also, I'm not really sure how to test for "more_files_on_tape", except
maybe checking for a "zero-length" file which might be a result
of two consecutive tape marks.

Thanks for any info.

Happy Holidays.

larry-granroth@uiowa.edu

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