topic Re: HDF5 data chunking example code in LabVIEW

HDF5 data chunking example code

Jim12345678 — Tue, 08 May 2018 14:07:13 GMT

Can anyone provide example code of how to save and read "chunked" data using HDF5?

Re: HDF5 data chunking example code

aeastet — Tue, 08 May 2018 14:12:05 GMT

You should search the forum in the future. Here is the exact same question:

https://forums.ni.com/t5/LabVIEW/HDF5-and-LabVIEW/td-p/3546387

Re: HDF5 data chunking example code

Jim12345678 — Tue, 08 May 2018 14:18:00 GMT

I did search the community and found the very same post you directed me to. The thread doesn't address my question.

Re: HDF5 data chunking example code

Peter_S — Tue, 08 May 2018 16:50:47 GMT

Hi Jim,

please find HDFSaveWF.vi to store an array of Waveforms in chunks.

The chunk size is the size of the Y-Array in the waveforms multiplied by ChunkFactor.

It stores also all attributes of simple types. Complex types (cluster, arrays) result in an error. Time t0 as number (seconds since 1.1.1904 UTC) and as xml string.

It use https://sourceforge.net/projects/h5labview/files/h5labview2-2.13.1.143.vip/download

and

_MGI\Error Handling\MGI Append String to Error Source.vi
_OpenG.lib\lvdata\lvdata.llb\Get TDEnum from Data__ogtk.vi
_OpenG.lib\lvdata\lvdata.llb\Array Size(s)__ogtk.vi

_OpenG.lib\array\array.llb\Remove Duplicates from 1D Array (Variant)__ogtk.vi

Peter

Re: HDF5 data chunking example code

Jim12345678 — Wed, 09 May 2018 20:52:33 GMT

Thank you to those who sent suggestions. I wrote some example code. It is intentionally written to be step-by-step to allow someone to follow the discrete steps. It uses the h5labview2 add on.