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I'm having trouble when I write on an existing dataset using hdf5dotnet. I'm writing in run time many times, and only the first write works perfectly. the second overwrite first datas. As you can see on the screen, the 4th first values are correct but the 4th last aren't but the space for it is normally created. I forgot to say it but values are double type.

screenshot

the code I'm using is there, I'm a newbie on this techno if you have an idea I will take it with pleasure! Please give me any advice for writing at the end of my dataset without overwriting.

if (data.Length <= 0)
  return;
try {
  H5DataSpaceId dataSpaceId = H5D.getSpace(dataSetId);
  int rank = H5S.getSimpleExtentNDims(dataSpaceId);
  long[] dims = H5S.getSimpleExtentDims(dataSpaceId);
  H5D.getCreatePropertyList(dataSetId);
  long[] dims_extended = dims[0] is 1 ? new long[] { (dims[0] + data.Length) - 1 } : new long[] { (dims[0] + data.Length) };
  H5D.setExtent(dataSetId, dims_extended);
  H5S.selectHyperslab(dataSpaceId, H5S.SelectOperator.SET, new long[] { dims[0] }, new long[] { data.Length });
  H5S.create_simple(rank, dims_extended);
  H5Array < float > hdf_data = new H5Array<float>(data);
  H5DataTypeId dataTypeId = H5D.getType(dataSetId);
  H5D.write(dataSetId, dataTypeId, hdf_data);
} catch (HDFException e) {
  MessageBox.Show(e.Message);
}
Ali Kleit
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guillaume lemariey
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1 Answers1

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my mistake was the size of the new dataspace created and to get the dataspaceid after the selectHyperslab's call

                int rank = H5S.getSimpleExtentNDims(dataSpaceId);
                long[] dims = H5S.getSimpleExtentDims(dataSpaceId);
                Console.WriteLine("il est ici le value mec: {0}", dims[0]);
                H5PropertyListId propertiesId = H5D.getCreatePropertyList(dataSetId);
                long[] block = new long[] { 1, 1 };
                long[] dims_extended = new long[] { (dims[0] + data.Length), 1 };
                H5D.setExtent(dataSetId, dims_extended);
                dataSpaceId = H5D.getSpace(dataSetId);
                H5S.selectHyperslab(dataSpaceId, H5S.SelectOperator.SET, new long[] { dims[0], 0 }, new long[] { dims_extended[0] - dims[0], 1 });
                long[] newdims = H5S.getSimpleExtentDims(dataSpaceId);
                H5DataSpaceId SpaceId = H5S.create_simple(1, new long[] { dims_extended[0] - dims[0], 1 });
                H5Array<double> hdf_data = new H5Array<double>(data);
                H5DataTypeId dataTypeId = H5D.getType(dataSetId);
                H5D.write(dataSetId, dataTypeId, SpaceId, dataSpaceId, new H5PropertyListId(H5P.Template.DEFAULT), hdf_data);
                H5S.close(dataSpaceId); ```
guillaume lemariey
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