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Re: Convert a byte array to a structure? [message #28976 is a reply to message #28877]

Sat, 26 January 2002 00:06

sven
Messages: 1
Registered: January 2002

Junior Member

> Problem is this:
> Lets say we have an arbitrary array of bytes, of length n. We also have
> a field, of n bytes length, that needs to be filled with that data as
> the concatenation of those values. As an example:
>
> ['ff'x,'01'x] -> 'ff01'x -> 65281
>
> BYTE[2] -> intermediate step (?) -> FIX[1]
>
> Would it be possible to do this with other size fields (like converting
> 4 bytes to a floating point number etc.)? Simply 'gluing' the elements
> of they byte array together, like 255*byte[0]+ byte[1] won't work with
> floating point numbers (?). I suspect the solution may involve pointers
> somehow, but I'm not sure how it might be done.

I am quite possibly missing something here, but why don't you use the
standard typecasting functions like fix() and float() ?

IDL> b = ['66'xb,'66'xb,'8a'xb,'41'xb]
IDL> help,b
B BYTE = Array[4]
IDL> print,b
102 102 138 65
IDL> print,float(b,0)
17.3000
IDL> print,fix(b[0:1],0)
26214

Isn't that what they're there for?

-- Sven Geier
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[Message index]

		Re: Convert a byte array to a structure? By: Craig Markwardt on Thu, 17 January 2002 16:10
		Re: Convert a byte array to a structure? By: Bhautik Joshi on Thu, 17 January 2002 15:43
		Re: Convert a byte array to a structure? By: Bhautik Joshi on Thu, 17 January 2002 14:57
		Re: Convert a byte array to a structure? By: Pavel A. Romashkin on Thu, 17 January 2002 13:39
		Re: Convert a byte array to a structure? By: sven on Sat, 26 January 2002 00:06

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