In-memory HDF5 File Image Construction

Hdf-forum archives
1

Hi,
I need to create in-memory hfd5 file without any disc IO and without saving (or reading) any data to disc. Here's copy/paste from HDF5FileImageOperations.pdf

<Open and construct the desired file with the Core file driver>
H5Fflush(fid);
size = H5Fget_file_image(fid, NULL, 0);
buffer_ptr = malloc(size);
H5Fget_file_image(fid, buffer_ptr, size);

First line is not clear. How do I open and construct file in memory without using H5Fcreate which requires file name?
Using HDF5 1.8.9.

regards
Adam

2

Hi Adam,

···

On Oct 16, 2012, at 12:52 PM, Adam Wierzchowski <adam@platige.com> wrote:

Hi,
I need to create in-memory hfd5 file without any disc IO and without saving (or reading) any data to disc. Here's copy/paste from HDF5FileImageOperations.pdf

<Open and construct the desired file with the Core file driver>
H5Fflush(fid);
size = H5Fget_file_image(fid, NULL, 0);
buffer_ptr = malloc(size);
H5Fget_file_image(fid, buffer_ptr, size);

First line is not clear. How do I open and construct file in memory without using H5Fcreate which requires file name?
Using HDF5 1.8.9.

  You'll need to use the filename with H5Fcreate(), but if you use the core VFD without the "backing store" option enabled, it'll be ignored.

  Quincey

3

Got it! Thank you.

Adam

···

On 2012-10-19 20:13, Quincey Koziol wrote:

Hi Adam,

On Oct 16, 2012, at 12:52 PM, Adam Wierzchowski <adam@platige.com> wrote:

Hi,
I need to create in-memory hfd5 file without any disc IO and without saving (or reading) any data to disc. Here's copy/paste from HDF5FileImageOperations.pdf

<Open and construct the desired file with the Core file driver>
H5Fflush(fid);
size = H5Fget_file_image(fid, NULL, 0);
buffer_ptr = malloc(size);
H5Fget_file_image(fid, buffer_ptr, size);

First line is not clear. How do I open and construct file in memory without using H5Fcreate which requires file name?
Using HDF5 1.8.9.

  You'll need to use the filename with H5Fcreate(), but if you use the core VFD without the "backing store" option enabled, it'll be ignored.

  Quincey

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