Dear all, I would like to access data in an HDF5 file with the name "/run_466/tof_detector_1/single_events_x" in a C/C++ program.
single_events_x is a linear array. The name "run_466" may vary between filename, but I assume that tof_detector_1 does not. Since my example file only contain one group in / (the variable "run_466") I though of getting this name with the function H5Lget_name_by_idx then append /tof_detector_1/single_events_x to that string to pass it to H5DOpen I have not managed from reading the online documentation, hence the following questions: 1) is there an easier approach to access "/*/tof_detector_1/single_events_x"? 2) if this is the correct approach, how do I call H5Lget_name_by_idx correctly? I find it difficult to figure out the meaning of H5_index_t index_field, H5_iter_order_t order, and hid_t lapl_id from the documentation at http://www.hdfgroup.org/HDF5/doc/RM/RM_H5L.html#Link-GetNameByIdx 3) I assume that once the Data are opened, the appropriate way to access single_events_x (a linear array of integers) is H5Dread( hid_t dataset_id, hid_t mem_type_id, hid_t mem_space_id, hid_t file_space_id, hid_t xfer_plist_id, void * buf ) again, the documentation tells me what all the things like mem_type_id, mem_space_id etc. are, but how to I set them properly? Or is there a direct access function that simple returns a single integer so that I can access the data one by one? Thanks a lot for any help, Tim P.S.: I posted a related question on 28/5/2014 where I was pointed at H5Literate by Werner Benger, but firstly there is only one group of unknown name in /, so I though iterating was not necessary, and secondly, as pointed out above, I find it difficult to read the documentation and figure out how to define the required input fields. I hope this post is more specific. -- Dr Tim Gruene Institut fuer anorganische Chemie Tammannstr. 4 D-37077 Goettingen GPG Key ID = A46BEE1A
signature.asc
Description: OpenPGP digital signature
_______________________________________________ Hdf-forum is for HDF software users discussion. [email protected] http://mail.lists.hdfgroup.org/mailman/listinfo/hdf-forum_lists.hdfgroup.org Twitter: https://twitter.com/hdf5
