How to write data into an existing HDF5 dataset

[ZL-Su]

Hi, guys:

I have saved an HDF5 file, such as "x.h5", on the disk. I want to open an existing dataset, such as "data", from the file of x.h5 and replace some data in dataset "data". The code snippet is attached below, but it does not work -- the new data is not written successfully. So is there any way to make the above operation succeed ?

I am here looking for ur solution, thx.

auto group = m_file->root().get_group("g");
auto mask = group.get_dataset("data");
auto dims = dataspace::Simple(mask. Dataspace()).current_dimensions();
auto selec = dataspace::Hyperslab({ 0,0,0}, { dims[0],dims[1],1 }, { 1,1,1 });
mask.extent(2, 1);
selec.offset(2, m_summary->stage_index-options()->reference_idx);
mask. Write(cv::Mat1b(m_summary->qp_valmask), select);

[yuelongyu]

hi @ZL-Su ,

Your code snippet looks OK. Basically one needs

• open dataset
• extent
• change offset
• write data

It would be good to show your full code or create a simple example to show your problem.

[yuelongyu]

hi @ZL-Su, have you resolved your problem?

[ZL-Su]

hi @yuelongyu, the problem has been solved, thx a lot.