comp.lang.idl-pvwave archive: archive » reading multiple tape files

Home » Public Forums » archive » reading multiple tape files

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

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

Report message to a moderator

[Message index]

reading multiple tape files

By: ljg on Wed, 23 December 1992 20:31

Previous Topic:	Re: Command buffer
Next Topic:	Minimization routine

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Fri Oct 10 15:22:50 PDT 2025

Total time taken to generate the page: 0.80111 seconds