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Re: Trouble reading unformatted f77 (unix) integers? [message #4156 is a reply to message #4155]

Wed, 10 May 1995 00:00

evans
Messages: 1
Registered: May 1995

Junior Member

In article <3oqb90$l2l@harbinger.cc.monash.edu.au>, Brett Hennig
<bretth@lovelace.maths.monash.edu.au> writes:
> Here's the problem:
> The F77 code:
>
> open(unit=51,name='test1.dat',status='unknown',form='unforma tted')
> write(51)1,2,3
> close(51)
> end
>
> The idl code(that doesn't work):
>
> openr,n,'test1.dat',/get_lun,/f77_unformatted
> x=0 & y=0 & z=0
> readu,n,x,y,z
> print,x,y,z -----> 1 0 2
> free_lun,n
> end

The problem is that x, y, z are being initialized as integers
(2 bytes) rather than longs (4 bytes), while the fortran program
is writing out 4-byte integers.

Replacing the line
x=0 & y=0 & z=0
with
x=0L & y=0L & z=0L
will make the idl code work correctly.

Cheers!
Ian
------------------------------------------------------------ -----------
Ian Evans phone: +1-(410)-338-4756
FOS Scientist fax: +1-(410)-338-4767
Space Telescope Science Institute internet: evans@fos.stsci.edu
3700 San Martin Drive NSI/DECnet: stfosc::evans
Baltimore, MD 21218
U.S.A.

Disclaimer: The statements made herein reflect solely the opinions of
the author, and should in no way be construed as being representative
of the views of the Space Telescope Science Institute, the Association
of Universities for Research in Astronomy, or the National Aeronautics
and Space Administration.
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[Message index]

		Re: Trouble reading unformatted f77 (unix) integers? By: thompson on Wed, 10 May 1995 00:00
		Re: Trouble reading unformatted f77 (unix) integers? By: evans on Wed, 10 May 1995 00:00
		Re: Trouble reading unformatted f77 (unix) integers? By: mallozzi on Wed, 10 May 1995 00:00

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