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Re: Reading binary files made by Python [message #49276 is a reply to message #49267]

Mon, 10 July 2006 08:55

Rick Towler
Messages: 821
Registered: August 1998

Senior Member

Sheldon wrote:
> Maarten wrote:
>> Sheldon wrote:
>>
>>> I have created som binary files using python and tried to read them
>>> with IDL. I used the binary_template as well but IDL completely
>>> misinterprets the data and returns wrong values and values that were
>>> never written in the file.
>>
>> I would recommend to write out the data in a portable file format, like
>> HDF (pytables is an easy way to do that). You can then use the idl HDF
>> routines to ingest the data, avoiding the larger part of the headaches.
>>
>> Maarten
>>
>> pytables: http://www.pytables.org/
>
> This is a very good idea. I think that I will do just that. The data
> was written and read on the same machine. Silly me, I thought that
> binary is just a binary but I guess not. Will try the HDF format.

Binary is just binary :) Try to keep it simple and just use OPENR/READU
and your knowledge of the file. Do it interactively a few bytes at a
time. You'll at least know exactly when things go wrong...

FWIW, I would consider XDR if you can do that from the Python side. It
is *much* easier to use than HDF, CDF, etc. and sounds like it is
exactly what you are looking for. The only potential issue is that I
don't think MATLAB reads it so if that is a requirement I would go back
to your original approach.

-Rick

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[Message index]

		Re: Reading binary files made by Python By: Maarten[1] on Tue, 11 July 2006 00:14
		Re: Reading binary files made by Python By: Rick Towler on Mon, 10 July 2006 13:22
		Re: Reading binary files made by Python By: James Kuyper on Mon, 10 July 2006 11:51
		Re: Reading binary files made by Python By: Rick Towler on Mon, 10 July 2006 08:55
		Re: Reading binary files made by Python By: Liberum on Mon, 10 July 2006 06:41
		Re: Reading binary files made by Python By: Maarten[1] on Mon, 10 July 2006 06:29

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