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WHILE NOT EOF(lun) wierdness under IDL 4.0.1 on Win NT
| WHILE NOT EOF(lun) wierdness under IDL 4.0.1 on Win NT [message #6396] |
Mon, 17 June 1996 00:00 |
Joseph M Zawodny
Messages: 24
Registered: March 1996
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Junior Member |
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Hi,
I just ran across a very strange "feature" on IDL 4.0.1
running on WIN-NT V3.51 and a Pentuim Pro. Basically the problem
goes like this. I have a routine which reads from a previously
opened file. It read in a structure and then 2 variable length
records. The file is unformatted and access using READU. One of
the fields in the structure contains the length of the arrays in
the following records. If I call the routine (I called it READ_REC)
manually, things are fine and I can read through the entire file
without any problem. Similarly, I can put READ_REC in a FOR loop
and work my way through the file. My intent has always been to
use a WHILE NOT EOF(lun) construct with a READ_REC call within
the WHILE block. This does not work! I can read the first two
sets of three records correctly and on the third call, I read
just the first three fields in the structure before hitting an EOF.
IDL really thinks that it is at the end of the file and I cannot
read any other data from the file. This is very reproducible.
Has anyone else run into this? I certainly have not seen this
happen on any of the UNIX versions of IDL I've used. Is this
just another IDL 4 Windows "feature" (like the lack of support
for 32 bit file systems - ie. long file names)?
TIA,
--
Work: Dr. Joseph M. Zawodny Play: Joe Zawodny
NASA Langley Research Center KO4LW@amsat.org
E-mail: J.M.Zawodny@LaRC.NASA.gov zawodny@exis.net
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