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Re: who ate my byte? [message #54972 is a reply to message #54967]

Mon, 23 July 2007 01:23

Paolo Grigis
Messages: 171
Registered: December 2003

Senior Member

rtowler@gmail.com wrote:
> IDL> print,strlen('test' + string(0B))
> 4
> IDL> print,strlen('test' + string(1B))
> 5
>
> Huh?
>
> I need to zero terminate data packets I'm sending (sent as byte array
> via UDP) but IDL silently strips them. Obviously I can do something
> like:
>
> data = [BYTE('test'), 0B]
>
> but I am curious as to why IDL does this. Any ideas?

Hidden deep within the docs, in the "bulding IDL applications" book,
one can find this explanation:

Due to the way in which strings are implemented in IDL, applying the STRING
function to a byte array containing a null (zero) value will result in the
resulting string being truncated at that position. Thus, the statement,

PRINT, STRING([65B, 66B, 0B, 67B])
produces the following output:

AB

So at least it is documented somewhere...

Ciao,
Paolo

>
> -Rick
>
> N 60 29.76
> W 178 42.48
>

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[Message index]

		Re: who ate my byte? By: rtowler on Mon, 23 July 2007 10:39
		Re: who ate my byte? By: KRDean on Mon, 23 July 2007 07:06
		Re: who ate my byte? By: Paolo Grigis on Mon, 23 July 2007 01:23
		Re: who ate my byte? By: Maarten[1] on Mon, 23 July 2007 01:09

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