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Re: read a C written binary file with IDL [message #79231 is a reply to message #79229]

Fri, 10 February 2012 07:12

Bill Nel
Messages: 31
Registered: October 2010

Member

On Feb 9, 11:56 pm, Manodeep Sinha <manod...@gmail.com> wrote:
> Hi,
>
> This is because C pads the structure to produce alignments. Under
> 'normal' operations, you would expect MyStruct to be 20 bytes,
> however, if you do a sizeof(struct MyStruct), you will probably see
> that the size is 24. (And you can enable the warning for gcc by using
> the compile time option -Wpadded).

The N_TAGS() function has LENGTH and DATA_LENGTH keywords:

IDL> print, n_tags(mystruct, /length)
24
IDL> print, n_tags(mystruct, /data_length)
20

I mention it because one might not think to look at the N_TAGS
function
for this sort of information.

--Wayne

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[Message index]

		Re: read a C written binary file with IDL By: Paul Van Delst[1] on Fri, 10 February 2012 08:02
		Re: read a C written binary file with IDL By: Bill Nel on Fri, 10 February 2012 07:12
		Re: read a C written binary file with IDL By: Paul Van Delst[1] on Fri, 10 February 2012 06:09
		Re: read a C written binary file with IDL By: Thibault Garel on Thu, 09 February 2012 21:08
		Re: read a C written binary file with IDL By: manodeep@gmail.com on Thu, 09 February 2012 20:56
		Re: read a C written binary file with IDL By: Thibault Garel on Mon, 20 February 2012 17:49

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