Hi Samer,
I think that the HDF5 C API documentation contains enough information
to find your way.
I have made my own C++ interface on top of the C API of HDF5.
It uses H5Dget_type to get the data type of a data set.
The shape can be obtained like:
int rank = H5Sget_simple_extent_ndims(itsDSid);
vector<hsize_t> shp(rank);
if (rank > 0) {
rank = H5Sget_simple_extent_dims(itsDSid, &(shp[0]), NULL);
}
where itsDSId is the data space id of the data set.
You cannot simply get the data into a vector<vector<vector>>> because
such a structure has non-contiguous memory. You can only do it hyperslab
by hyperslab which can be slowish. But why don't use you an array
package like boost::multi_array (or Blitz or casacore Arrays) to hold
your array data?
You can get a single element using the appropriate hyperslab, but
iterating in that way through your data set will be very slow.
Cheers,
Ger
>>> <[email protected]> 6/30/2010 12:11 PM >>>
Hello programmers :-),
I'm still new to this HDF file format, and what I could do is run the
C++
examples given in the tutorial to read a pressures data file given to
me
by someone.
My first question is, is it possible to read the values of my H5 file
to a
vector? all I've seen is array works, which is not convenient when
working
generally with different sizes of data files (the files I'm using are
3D
matrices).
So what I would like to do, is having a program in this scheme:
1-Read the file and determine the data type and size
2-create a 3D vector for reading the data (like vector< vector<
vector<
double > > > data;)
3-copy the data from the file to this vector.
is this possible with the current library?
My second question, is there a function in the library to read a
single
element? I just found a function for reading a whole set into an array
in
the tutorial:
status = H5Dread(dataset_id, H5T_NATIVE_INT, H5S_ALL, H5S_ALL,
H5P_DEFAULT,
dset_data);
If there's a tutorial that is more detailed than this, or let's say a
manual, I'd be so happy to know about its existence.
Thank you, any efforts are highly appreciated.
Best regards,
Samer
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_______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
