Opaque Dataset elements

Andy_McHugh · July 23, 2010, 10:38pm

I'm trying to get the size of an opaque dataset element so that I can
allocate the buf before doing the H5Dread().Is there a way to do this?

Each element in the dataset should have a different size as it's just a 1
dimensional array of blobs...

I could switch from opaque to vlen strings if that would be better, or
perhaps write the size out in an attribute... but I'm surely missing
something... there must be a way...

Any help appreciated...

Thanks

Andy

Quincey_Koziol · July 24, 2010, 5:01am

Hi Andy,

···

On Jul 23, 2010, at 5:38 PM, Andy wrote:

I’m trying to get the size of an opaque dataset element so that I can allocate the buf before doing the H5Dread().Is there a way to do this?

Each element in the dataset should have a different size as it’s just a 1 dimensional array of blobs...

I could switch from opaque to vlen strings if that would be better, or perhaps write the size out in an attribute... but I’m surely missing something... there must be a way...

Any help appreciated...

It's late and I haven't checked the docs, but I would think that H5Tget_size() should give you what you want.

Quincey

Andy_McHugh · July 24, 2010, 7:40am

Hi Quincey,

Thanks for the quick response. Not sure how I missed that J. I'm a newbie
on HDF5 and still finding my way. My work computers off till Monday for an
office move but I'll be able to try it then.

Cheers