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Re: read a C written binary file with IDL [message #79229]

Fri, 10 February 2012 08:02

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Cool! I did not know that.

cheers,

paulv

Bill Nel wrote:
> 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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