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Hi Ed, Yup, you are correct - I'll report it as a doc bug. Quincey > Seems like an error in the docs. The ref manual sez: (note last parameter) > > > Name: H5Gget_objname_by_idx > Signature: > ssize_t H5Gget_objname_by_idx(hid_t loc_id, hsize_t idx, char > *name, size_t* size ) > > > But, H5Gpublic.h contains the following: > > H5_DLL ssize_t H5Gget_objname_by_idx(hid_t loc_id, hsize_t idx, char* name, > size_t size); > > > The last parameter is not a pointer after all! > > Ed > >From owner-netcdf-hdf@xxxxxxxxxxxxxxxx 01 2003 Nov -0700 09:44:49 Message-ID: <wrxllr0f37i.fsf@xxxxxxxxxxxxxxxxxxxxxxx> Date: 01 Nov 2003 09:44:49 -0700 From: Ed Hartnett <ed@xxxxxxxxxxxxxxxx> To: netcdf-hdf@xxxxxxxxxxxxxxxx Subject: extensible datasets in every dimension? Received: (from majordo@localhost) by unidata.ucar.edu (UCAR/Unidata) id hA1GipIJ017962 for netcdf-hdf-out; Sat, 1 Nov 2003 09:44:51 -0700 (MST) Received: from rodney.unidata.ucar.edu (rodney.unidata.ucar.edu [184.108.40.206]) by unidata.ucar.edu (UCAR/Unidata) with ESMTP id hA1GioOb017957 for <netcdf-hdf@xxxxxxxxxxxxxxxx>; Sat, 1 Nov 2003 09:44:50 -0700 (MST) Organization: UCAR/Unidata Keywords: 200311011644.hA1GioOb017957 Lines: 32 User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: owner-netcdf-hdf@xxxxxxxxxxxxxxxx Precedence: bulk Greeting to HDF HQ! Some questions: 1 - If any dimension of a dataset is to be extensible, the dataset must be chunked, correct? 2 - If I have a dataset with one expendables dimension, and several fixed dimensions, I can create it using a space like this: if ((spaceid = H5Screate_simple(var->ndims, dimsize, maxdimsize)) < 0) BAIL(NC_EHDFERR); Where dimsize is an array of initial dimension sizes, and maxdimsize is an array of max dimension sizes, or -1 for an unlimited dimension. The problem I have is this. If I try and create a space with one of the dimsizes as zero, and the corresponding maxdimsize as -1, HDF5 hands when I try to close the defined dataset (this seems like a HDF bug, BTW). So I can do it if I start with a dimsize of 1 instead of 0, but this is not the netcdf way. After defining such a dataset, when I get the number of records in it, using H5Sget_simple_extent_dims, I get a size of one along that dimension, even though I haven't written any data to it yet, because I have to define it as having length of at least one. Any comment or help would be appreciated... Thanks! Ed