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Inconsistent problem of HDF I/O [message #33038]

Wed, 27 November 2002 08:02

K.Y.Choi
Messages: 4
Registered: April 2002

Junior Member

Hello

I've got HDF files that have been created with NCSA HDF Version 3.3
Release 3, February 1994. It contains several VGroups and one or two
SD objects. I wrote an IDL code for the HDF file I/O, that extracts
some file information from VGroups, as well as image data in SD
objects.

My routine has inconsistant problem, that is, when I tried to run my
code to open a file, it some times yields error message like

% HDF_CLOSE: Failed to close file (ï¿½).

In parentheses, it shows funny ASCII shapes, such as ï¿½ shape or |
shape. With or without recompiling, it *sometimes* works after a
couple of trials for the same file. The file has no problem whatsoever
with HDF_BROWSER, indicating that the HDF file is fine.

Only solution I can think of was to seperate HDF_OPEN - HDF_CLOSE from
HDF_SD_START - HDF_SD_ENDACCESS - HDF_SD_END. Hence structure of my
code is as follows,

HDF_OPEN
:
access VGroup
:
HDF_CLOSE

HDF_SD_START
:
access SD
:
HDF_SD_ENDACCESS
HDF_SD_END

HDF_OPEN
:
access VGroup
:
HDF_CLOSE

The error always points HDF_CLOSE at the end of the routine

I thought (still think) HDF_OPEN - HDF_CLOSE and HDF_SD_START -
HDF_SD_ENDACCESS - HDF_SD_END behave exactly like OPENR /GET_LUN -
FREE_LUN. But they don't?

Should I blame a guy who creats the HDF file or IDL or myself? How am
I improve my routine as solid as BMW?

I look forward to hearing from you guys soom. Please share your wisdom
and experience...

Thanks

Reno

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[Message index]

		Inconsistent problem of HDF I/O By: K.Y.Choi on Wed, 27 November 2002 08:02
		Re: Inconsistent problem of HDF I/O By: MarioIncandenza on Mon, 22 July 2013 11:15
		Re: Inconsistent problem of HDF I/O By: MarioIncandenza on Mon, 22 July 2013 11:49

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