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Re: Constructing integer variables from two bytes? [message #78603 is a reply to message #78602]

Wed, 07 December 2011 04:52

Lajos Foldy
Messages: 176
Registered: December 2011

Senior Member

On Dec 7, 6:46 am, Jared Espley <jesp...@gmail.com> wrote:
> I have data in a byte array that I would like to use to construct
> arrays of unsigned integers and integers.
>
> In code:
> A = [1B, 2B]
> B = 0
> B = A[0]*256 + fix(A[1])
>
> Which will give B as an integer type with a value 258.
>
> I realize that I can construct functions to do this (multiple each bit
> by the appropriate value and checking which OS we're in so that we get
> endianness correct) but I was wondering if someone had already done
> this rigorously?
>
> Thanks,
> Jared

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

regards,
Lajos

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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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