Reading string attribute from group returns weird results

[fmanso]

Hello,

I am trying to read an string attribute and I am having two problems. The first one is that using the same file the string returned is not the same every run. The second one is related to charset, I think.

I attached a sample. The HDF5 file only have one group with attributes. The problem is the string attribute called 'name'. The code is this:

var HDF5 = require('hdf5');
var HDF5_GLOBALS = require('hdf5/lib/globals');
var hdf5 = HDF5.hdf5;
var h5lt = HDF5.h5lt;
var Access = HDF5_GLOBALS.Access;

var hdf5File = new hdf5.File("sample.h5", Access.ACC_RDONLY);
var hdf5Group = hdf5File.openGroup("neuron_layer_0");

hdf5Group.refresh();
console.dir(hdf5Group);
hdf5Group.refresh();
console.dir(hdf5Group);
hdf5Group.refresh();
console.dir(hdf5Group);

And the result is:

HDFView show this properties on the group:

sample.zip

[rimmartin]

Thank you for the sample and presentation of problem. Will study it

[rimmartin]

It is a variable length string attribute; I'm adding support for it. Should get it over the weekend

[rimmartin]

Beginning to read. Have to think how to keep the difference of the string type in javascript to be able retain type when flushing back to the h5.

And i see you have array of doubles also as an attribute. I'll add more support for attributes in general including when they are arrays

[fmanso]

Great, thank you so much.

El vie., 17 jun. 2016 15:23, rimmartin notifications@github.com escribió:

Beginning to read. Have to think how to keep the difference of the string
type in javascript to be able retain type when flushing back to the h5.

Also i see you have array of doubles also as an attribute. I'll add more
support for attributes in general including when they are arrays

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[rimmartin]

For where the type needs to be preserved I'm putting in string objects when writing and returning string objects with the type.

reading

var hdf5Group = hdf5File.openGroup("neuron_layer_0");
hdf5Group.refresh();
var type=hdf5Group.name.type;
console.dir(hdf5Group.name);

where type will be "variable-length" and name is "mflayer"

For writing

var hdf5Group = hdf5File.openGroup("neuron_layer_0");
var name=new String("mflayer");
name.type="variable-length";
hdf5Group.name=name;

Hopefully a few more evenings

[fmanso]

Looks nice, thanks !

[rimmartin]

There is now a test that creates an h5 with attributes similar to yours:
https://github.com/HDF-NI/hdf5.node/blob/master/test/test_attributes.js

mocha --harmony --require should --require co-mocha ./test/test_attributes.js #2> /dev/null

adding other changes and tests before publishing so you might want to clone from here. Especially if you have other as yet unsupported h5's.

[fmanso]

Thanks. I will be able to try it on next monday, but I am not sure I am going to know how to build from cloned repo. Please tell me when it is available in npm. Thanks.

[fmanso]

I managed to compile and test. It is working like a charm. Thank you !

[rimmartin]

Oh great! I'll publish after getting a few more types handled