That did it. Thanks. It was the whole little endian-big endian thing. So instead of reading the data type from the file, I just created a new datatype since I knew beforehand what data type it would be.
···
----- Original Message ----
From: Elena Pourmal <epourmal@hdfgroup.org>
To: abhilash chandy <abhilash_chandy@yahoo.com>; hdf forum <hdf-forum@hdfgroup.org>
Sent: Friday, March 7, 2008 7:11:14 PM
Subject: Re: Are hdf5 files platform dependent?
<!--
blockquote, dl, ul, ol, li {padding-top:0;padding-bottom:0;}
-->Re: Are hdf5 files platform
dependent?Abhilash,
Please make sure that you are using correct datatype in H5Dread
call; don't use datatype returned by H5Dget_type since this will be
a datatype that describes data IN THE FILE. H5Dread call needs
datatype that describes data in memory (i.e. that describes the buffer
you are reading into)
As a rule of thumb one should use *NATIVE* types to read data
back. Please see
http://www.hdfgroup.org/HDF5/doc/RM/PredefDTypes.html for available NATIVE datatypes.
You may also look at H5Tget_native_type function
http://www.hdfgroup.org/HDF5/doc/RM/RM_H5T.html#Datatype-GetNativeType to get an appropriate memory datatype for morecomplex types.
Elena
At 3:53 PM -0800 3/7/08, abhilash chandy wrote:
Hi,
Thanks for that. I am sorry, but I am not sure if I understandwhat an opaque data structure is and what is not.
But the output of h5dump looks fine to me. All the information is inthe file for sure. Also, I could read the information off of the fileon the original platform in which the file was created, but not onthis new platform...so I dont know what is going on.
Can anyone please help
----- Original Message ----
From: "McCloskey, David L."<McClosDL@westinghouse.com>
To: hdf forum <hdf-forum@hdfgroup.org>
Sent: Friday, March 7, 2008 3:56:44 PM
Subject: RE: Are hdf5 files platform dependent?
AFAIK, they are platform independent unless you use the opaquedata
structures. You can check to make sure the file is beingwritten
correctly using h5dump or HDFView.
Dave McCloskey
-----Original Message-----
From: abhilash chandy [mailto:abhilash_chandy@yahoo.com]
Sent: Friday, March 07, 2008 3:55 PM
To: hdf forum
Subject: Are hdf5 files platform dependent?
Hello,
This might be a stupid question, but I thought that hdf5 fileswould
have been platform independent.
I wrote a code that writes out hdf5 files with certain informationin
there. I ported the files over to my desktop and ran another codeto
read the information out of it so that I cold manipulate them. Butit
doesnt seem to read them correctly on my machine, Is that possible?or
am I probably making a mistake the my original code where I writeout
stuff.
Any ideas.
Thanks in advance
Abhilash.
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The HDF Group
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