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call_external for file I/O [message #13223]

Wed, 21 October 1998 00:00

Charlie Solomon
Messages: 10
Registered: September 1998

Junior Member

Hello experts,

Is anyone out there using call_external to read image files into a variable
on the Windows NT platform? I have used a c routine on the Solaris platform
called map_file, which bypasses the standard I/O layer and maps data
directly into/from memory, making data access very fast compared to using
IDL's built in file I/O utils. I did not write map_file, but my
understanding is that it utilizes features in unix which allow this sort of
memory mapping without going through the stdio layer. I would love to get
the same speed on my NT machine. Any ideas?

Thanks,
Charlie Solomon
Raytheon Systems Co., El Segundo

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Re: call_external for file I/O [message #13275 is a reply to message #13223]

Tue, 27 October 1998 00:00

korpela
Messages: 59
Registered: September 1993

Member

In article <712p27$fr7@hacgate2.hac.com>,
Charlie Solomon <crsolomon@west.raytheon.com> wrote:
> VARRAY looks like a good implementation of what our map_file does,
> and this site is a very good reference, thank you. I want to work on
> doing something like this with WindowsNT. Eric's page says that it
> should be straightforward to convert VARRAY to use Win32's...we'll
> see!

Did I say straightforward? I could have sworn I said possible. :)
Let me know what happens. I'll be glad to give any assistance I can.

Eric

--
Eric Korpela | An object at rest can never be
korpela@ssl.berkeley.edu | stopped.
<a href="http://sag-www.ssl.berkeley.edu/~korpela">Click for home page.</a>

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