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Re: reading unformatted data into a structure [message #29729 is a reply to message #29726]

Tue, 19 March 2002 09:23

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Rick Towler (tsehai@attbi.com) writes:

> I actually want the ASCII characters that the char array refers to.
> Interestingly, when I do use the string function I get a blank line. I have
> tried different format statements to no avail.
>
> IDL> print,header.datum
> 0 0 87 71 83 56 52 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0
> IDL> print,string(header.datum)
>

It's hard to know what this should be. I agree with
previous posters that you may have structure alignment
problems. But, typically, if a string were set to bytes
then blank characters would have the value 32, not 0.
(I don't know what the ASCII character is for 0B.)

But, if you do this:

IDL> indices = Where(header.datum EQ 0, count)
IDL> IF count GT 0 THEN header.datum[indices] = 32B
IDL> Print, String(header.datum)
WGS84

I don't know why this works, exactly. :-)

Cheers,

David
--
David W. Fanning, Ph.D.
Fanning Software Consulting
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
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[Message index]

		Re: reading unformatted data into a structure By: Nigel Wade on Wed, 20 March 2002 02:20
		Re: reading unformatted data into a structure By: Rick Towler on Tue, 19 March 2002 09:54
		Re: reading unformatted data into a structure By: David Fanning on Tue, 19 March 2002 09:23
		Re: reading unformatted data into a structure By: Rick Towler on Tue, 19 March 2002 08:49
		Re: reading unformatted data into a structure By: Nigel Wade on Tue, 19 March 2002 02:26
		Re: reading unformatted data into a structure By: Nigel Wade on Tue, 19 March 2002 01:42
		Re: reading unformatted data into a structure By: ignore_this_adress on Tue, 19 March 2002 00:38
		Re: reading unformatted data into a structure By: David Fanning on Mon, 18 March 2002 18:52

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