| Re: Read Hex numbers [message #5255] |
Fri, 24 November 1995 00:00 |
boswell
Messages: 7
Registered: October 1994
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Junior Member |
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Apologies to the group for the wasted bandwidth of my last post.
Michael is reading in his binary data just fine, he simply wants to print out
the result in hex. My last answer had the right idea, but my example was
backwards.
What you want to do is use the Z format specifier on output. This works fine
in IDL. For example, if you want to output nibbles of your 2 byte array, you
could use a statement such as
IDL> print, bytearray, format='(2Z2)'
Jonathan Boswell
FDA/CDRH
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| Re: Read Hex numbers [message #5256 is a reply to message #5255] |
Fri, 24 November 1995 00:00  |
Frank J. �ynes
Messages: 17
Registered: February 1995
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Junior Member |
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SLAMECZKA@EZINFO.VMSMAIL.ETHZ.CH (SLAMECZKA,MICHAEL) wrote:
> Hello everybody!
>
> I have the following problem; i have a binary file, which I wanna read. I know
> that pw-wave can read this file in binary, ascii, integer, float and complex,
> but I need to read it in HEX, that means
>
> a sequence looks like this: 0001 1001 0100 0011
^^^^^^^^^^^^^^^^^^^^
> and PW-Wave should display: 1 9 4 3
>
> with a bytearray the output looks like this: 25 67
>
> Has anybody some ideas, how I can handle this problem?
>
> thanks in advance
>
> michael
Maybe I'm stupid, but I don't understand your question.
Or are you mixing some terms here?
Is your file really binary, or is it an ascii representation of
binary numbers?
What do you mean by "read it in HEX" ?
Please clarify, and I'll try to help.
--
/* Frank J. �ynes | frank@spacetec.no /*
/* Spacetec a.s | Phone: +47 77684500 Fax: +47 77655859 /*
/* Prestvannv. 38, | /*
/* N-9005 Troms�, Norway | (...with the bravery of being out of range!) /*
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| Re: Read Hex numbers [message #5262 is a reply to message #5255] |
Fri, 24 November 1995 00:00 |
rivers
Messages: 228
Registered: March 1991
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Senior Member |
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In article <494frp$4p7@elna.ethz.ch>, SLAMECZKA@EZINFO.VMSMAIL.ETHZ.CH (SLAMECZKA,MICHAEL) writes:
> Hello everybody!
>
> I have the following problem; i have a binary file, which I wanna read. I know
> that pw-wave can read this file in binary, ascii, integer, float and complex,
> but I need to read it in HEX, that means
>
> a sequence looks like this: 0001 1001 0100 0011
> and PW-Wave should display: 1 9 4 3
>
> with a bytearray the output looks like this: 25 67
It looks like you want to read the data into "nibbles" of 4 bits each, rather
than bytes of 8 bits each. This is really not "read in HEX". It think the
following will do what you want.
IDL> bytes = bytarr(1000)
IDL> nibbles = bytarr(2,1000)
IDL> READU, 1, bytes
IDL> nibbles(0,*) = bytes and '0f'x
IDL> nibbles(1,*) = bytes/16 and '0f'x
IDL> nibbles = reform(nibbles, 2000)
Note that the lines 4 and 5 are architecure dependent: the assignment depends
upon whether you have a big-endian or little-endian machine.
____________________________________________________________
Mark Rivers (312) 702-2279 (office)
CARS (312) 702-9951 (secretary)
Univ. of Chicago (312) 702-5454 (FAX)
5640 S. Ellis Ave. (708) 922-0499 (home)
Chicago, IL 60637 rivers@cars3.uchicago.edu (Internet)
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