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Hi Ed, Hmm, the program seems to be running fine here. This is the output: number of data in dataset: 1 number of data in dataset: 1 the float: 99.900002 number of data in dataset: 2 number of data in dataset: 2 the float: 88.800003 What machine are you running on? What version of HDF5? Quincey > Do me a favor, compile and run this program. > > When I chage this program to use a contiguous dataset, and take out > the H5Dextend call, everything works. But using an extendable dataset, > it give me a seg fault. > > Obviously I'm doing something wrong with respect to my setting up or > using the chunked dataset. I'm going to reread the docs and see what > they say again... > > Ed >From owner-netcdf-hdf@xxxxxxxxxxxxxxxx 29 2003 Oct -0700 10:18:00 Message-ID: <wrxbrs0hsjb.fsf@xxxxxxxxxxxxxxxxxxxxxxx> Date: 29 Oct 2003 10:18:00 -0700 From: Ed Hartnett <ed@xxxxxxxxxxxxxxxx> To: netcdf-hdf@xxxxxxxxxxxxxxxx Subject: confusion about H5Gget_objname_by_idx Received: (from majordo@localhost) by unidata.ucar.edu (UCAR/Unidata) id h9THI1Jo021523 for netcdf-hdf-out; Wed, 29 Oct 2003 10:18:01 -0700 (MST) Received: from rodney.unidata.ucar.edu (rodney.unidata.ucar.edu [188.8.131.52]) by unidata.ucar.edu (UCAR/Unidata) with ESMTP id h9THI0Ob021515 for <netcdf-hdf@xxxxxxxxxxxxxxxx>; Wed, 29 Oct 2003 10:18:00 -0700 (MST) Organization: UCAR/Unidata Keywords: 200310291718.h9THI0Ob021515 Lines: 19 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 Howdy all! 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