What’s the storage layout of the attribute? (i.e., is it H5S_SIMPLE or H5S_SCALAR?)
G. From: Hdf-forum [mailto:[email protected]] On Behalf Of Matt Wood Sent: Thursday, March 30, 2017 9:42 AM To: [email protected] Subject: [Hdf-forum] Reading VLEN string attribute values. Hi, I am using HDF.PInvoke 1.10.0.4 but I am struggling to read the string value of an attribute when it is variable length. Ultimately I believe I need to call: GCHandle hnd = GCHandle.Alloc(data, GCHandleType.Pinned); int err = H5A.read(aid, typeId, hnd.AddrOfPinnedObject()); hnd.Free(); Where data is a suitable object. I am confident that the attribute id (aid) is correct because it works for all the other attributes types. I am not so confident on the typeId, I have tried: H5T.get_type(aid); * H5T.get_native_type(tid); H5T.create(H5T.class_t.VLEN, H5T.VARIABLE); H5T.create(H5T.class_t.STRING, H5T.VARIABLE); Likewise for the data and I have tried: * data = new byte[256]; data = new IntPtr[1]; => data[0] = GCHandle.Alloc(byte[256], GCHandleType.Pinned).AddrOfPinnedObject() The only time some non-zero values were returned was case (*) but then I couldn't relate the values to the expected text. Thanks, Matt
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