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Re: BYTES to LONG [message #22339 is a reply to message #22334]

Tue, 07 November 2000 00:00

Paul van Delst
Messages: 364
Registered: March 1997

Senior Member

Kelly Dean wrote:
>
> I am reading in a combination ASCII/BINARY file with USGS DLG
> information as a binary file.
>
> I am able to convert the bytes into ASCII with STRING([72B, 101B, 108B,
> 108B, 111B]).
>
> However, I cannot figure out how to convert the 4 bytes into LONG, whihc
> is the UTM X and Y numbers. Any suggestions?
>
> Kelly

If I understand your question correctly,

if

x = [ 0B, 1B, 1B, 1B ]

then long_x = TOTAL( ISHFT( LONG(x), [24,16,8,0] ) )

??

This gave me long_x = 65793.0 = 65536 + 256 + 1 which seems correct, no?

For some reason the TOTAL returned a floating point number? Weird. Never noticed that
before.

Hmm.

You could also just add the requisite power of two to each individual element before
totaling also. Dunno if either works with a sign bit.

paulv

--
Paul van Delst Ph: (301) 763-8000 x7274
CIMSS @ NOAA/NCEP Fax: (301) 763-8545
Rm.207, 5200 Auth Rd. Email: pvandelst@ncep.noaa.gov
Camp Springs MD 20746

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[Message index]

		Re: BYTES to LONG By: Paul van Delst on Wed, 08 November 2000 00:00
		Re: BYTES to LONG By: Kelly Dean on Wed, 08 November 2000 00:00
		Re: BYTES to LONG By: Kelly Dean on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: Paul van Delst on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: John-David T. Smith on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: davidf on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: Paul van Delst on Tue, 07 November 2000 00:00
		Re: BYTES to LONG By: Med Bennett on Tue, 07 November 2000 00:00

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