| Re: Size of variables in bytes? [message #9847 is a reply to message #9840] |
Tue, 02 September 1997 00:00  |
davidf
Messages: 2866
Registered: September 1996
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Senior Member |
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Christian Salow writes:
> is it true that there is no function in IDL 5.0.2 to get the size of a
> variable in bytes (except structures)?
True.
> An integer variable seams to be 2 bytes indpendent from the system
> architecture but a string seams to be 1 byte per character on a Win32
> machine and 2 bytes on a SunOS-machine. I wrote a string to an
> unformatted output file and looked at the filepointer to get the size in
> bytes.
I think it would be less trouble to use the StrLen function to
find the length of the string. This is its size in bytes. Even
on a SunOS machine, I should think.
> Is the following true and is it machine independent?
> byte 1b
> integer 2b
> long int 4b
> floating 4b
> double 8b
> string ???
> structure n_tags(var, /length)
Yes, this is true and it is machine independent.
Strings are always ??? (variable length) in IDL.
> What about:
> complex floating
8 bytes.
> double-precision complex
16 bytes.
> pointer
4 bytes
> object reference
Don't know.
Cheers,
David
----------------------------------------------------------
David Fanning, Ph.D.
Fanning Software Consulting
Customizable IDL Programming Courses
Phone: 970-221-0438 E-Mail: davidf@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com
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