Hello Michael,
I just want to note that
createDataSet() takes const DataType& data_type, not hid_t data_type
Please check other arguments as well.
You may also need H5Tset_size(data_type, H5T_VARIABLE).
Binh-Minh
________________________________
From: Hdf-forum <[email protected]> on behalf of Michael
Barrucco <[email protected]>
Sent: Monday, August 1, 2016 3:28 PM
To: [email protected]
Subject: [Hdf-forum] writing std::strings to an hdf5 file
Hello Folks:
I am trying to write a string from a process in which the string changes at
each iteration, and i dont know the size of the resulting string array at the
time the write needs to happen.
I have some code, however, it only write the first character of the string on
each iteration. Here is some sample code.
initialization============================================
std::string file_string = "foo.h5";
H5File _file( file_name, H5F_ACC_TRUNC );
_col_chunk=0;
DSetCreatPropList cparms_str;
hsize_t chunk_dims_str[2] = {1,1};
cparms_str.setChunk(2, chunk_dims_str);
hid_t datatype = H5Tcopy(H5T_C_S1);
char fill_val_str[1] = {""};
cparms_str.setFillValue( datatype, &fill_val_str);
const H5std_string dataset_state("string_data");
_dataset_state = _file.createDataSet(dataset_state,
datatype, mspace_s, cparms_str);
Writing within the process===================================================
Get current string
hsize_t dimsext_s[2] = {1, 1};
const char * current_string_char = current_string.c_str();
size_s[0] = dimsext_s[0];
size_s[1] = dimsext_s[1] + _col_chunk;
DataSpace filespace_state(_dataset_state.getSpace());
filespace_state.selectHyperslab(H5S_SELECT_SET, dimsext_s, offset_s);
DataSpace memspace_state(2, dimsext_s, NULL);
hid_t datatype = H5Tcopy(H5T_C_S1);
_dataset_state.write(currrent_string_char, datatype, memspace_state,
filespace_state);
loading the resulting file==============================
In [1]: import numpy as np
In [2]: import h5py
In [3]: file = h5py.File('dragon_plumes.h5')
In [4]: fc_state = np.array(file.get('fc_state'))
In [5]: fc_state
Out[5]:
array([['i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i',
'i', 'i', 'i', 'i', 'i', 'i', 'i', 'i', 'a', 'a', 'a', 'a', 'a',
'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a', 'a',
'a', 'a']],
dtype='|S1')
Any thoughts?
Thanks!
Mike
--
"It is difficult to say what is impossible, for the dream of yesterday is the
hope of today and the reality of tomorrow--Robert H. Goddard."
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