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Re: Constructing integer variables from two bytes? [message #78602 is a reply to message #78595]

Wed, 07 December 2011 05:19

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Lajos Foldy writes:

> FIX can combine the bytes into integers (in host byte order, use
> SWAP_ENDIAN if the source byte order is different):
>
> IDL> b2=fix(a, 0, 1, type=2)
> IDL> help, b2
> B2 INT = Array[1]
> IDL> print, b2
> 513
> IDL> print, swap_endian(b2)
> 258

You may have missed this in Lejos's explanation, but
all of these "casting" functions (e.g., Fix, Long, Float,
etc.) can extract data from byte arrays in this fashion.
And not just one value at a time, but all the values
at once. The trick is to use the offset parameter to
tell the function how may byte values to "grab" when
it does the conversion.

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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[Message index]

		Re: Constructing integer variables from two bytes? By: greg.addr on Wed, 07 December 2011 08:32
		Re: Constructing integer variables from two bytes? By: David Fanning on Wed, 07 December 2011 05:19
		Re: Constructing integer variables from two bytes? By: Lajos Foldy on Wed, 07 December 2011 04:52

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