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Re: big file navigation [message #36780 is a reply to message #36777]

Tue, 28 October 2003 11:53

R.G. Stockwell
Messages: 363
Registered: July 1999

Senior Member

"Ben Tupper" <btupper@bigelow.org> wrote in message
news:bnm487$1317fk$1@ID-189398.news.uni-berlin.de...
...
> IDL> for i = 0L, 55855-1 do readU, U,d
>
>
> Problem solved! I can break the file into smaller 'chunks' of 4GB by
reading in
> images and writing them to a new file. OK!
>
> But here's what I wish I understood (and could exploit!) Somewhere the
system is
> keeping track of the file location so that READU knows where to read. So,
deep
> down in its guts, IDL is navigating its way through with 64-bit file
offsets.
> Ain't it? Is there anything here I could get my hooks into so I don't
have to
> break the original file into smaller ones?
>
> Cheers,
> Ben

The point_lun seems to use a 64 bit offset

from the help:

If Unit is negative, Position must be a named variable into which the
current file position will be stored. The returned type will be a longword
signed integer if the position is small enough to fit, and an unsigned
64-bit integer otherwise.

Cheers,
bob

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[Message index]

		Re: big file navigation By: R.G. Stockwell on Tue, 28 October 2003 13:42
		Re: big file navigation By: btt on Tue, 28 October 2003 13:33
		Re: big file navigation By: R.G. Stockwell on Tue, 28 October 2003 11:53
		Re: big file navigation By: btt on Fri, 31 October 2003 06:00

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