Hi Sahar,
On Aug 16, 2011, at 5:00 PM, sghanavati wrote:
> Hi,
>
> I've looked at the example and in my code h5_data->label is of type char*
> (h5_data is a struct). I'm assuming that the problem is in the data type
> conversion from python to C++? I have created the dataset containing "None\0"
> strings in python and I read it in C++ , substitute the strings and want to
> save them back to the dataset.
I'm not familiar enough with Python to answer your question, sorry.
Anyone else?
Quincey
> Thank you
> Sahar
>
> From: Quincey Koziol [via hdf-forum] <[hidden email]>
> Sent: Tue, 8/16/2011 3:53pm
> To: sghanavati <[hidden email]>
> Subject: Re: over-writing variable length string in dataset using hdf5 C++ API
>
> Hi Sahar,
>
> On Aug 2, 2011, at 12:41 PM, sghanavati wrote:
>
> > Hi,
> >
> > I have a dataset "dataset_label" in a hdf5 file format which contains a
> > string of N elements equals to "None\0". I read the dataset using hdf5 C++
> > API:
> >
> > hid_t datatype = H5Tcopy (H5T_C_S1);
> > H5Tset_size (datatype, H5T_VARIABLE);
> > H5::DataType dtype = dataset_label.getDataType();
> > dataset_label.read(h5_data->label ,dtype ,memspace_l, dataspace_l);
> >
> > I then replace "None\0" with a variable length strings(ranging from 3-35
> > chars in each end with null terminator) in char* Label_buf and want to
> > over-write these new strings in the dataset, but when I use the c++ example
> > varlen.cpp :
> >
> > H5::StrType tid1(0, H5T_VARIABLE);
> > dataset_label.write((void*)Label_buf,tid1);
> >
> > I get a run-time error as follows:
> > HDF5-DIAG: Error detected in HDF5 (1.8.6) thread 0:
> > #000: H5Dio.c line 266 in H5Dwrite(): can't write data
> > major: Dataset
> > minor: Write failed
> > #001: H5Dio.c line 541 in H5D_write(): unable to set up type info
> > major: Dataset
> > minor: Unable to initialize object
> > #002: H5Dio.c line 836 in H5D_typeinfo_init(): unable to convert between
> > src and dest datatype
> > major: Dataset
> > minor: Feature is unsupported
> > #003: H5T.c line 4449 in H5T_path_find(): no appropriate function for
> > conversion path
> > major: Datatype
> > minor: Unable to initialize object
> >
> >
> > if I do
> > H5::DataType dtype = dataset_label.getDataType();
> > dataset_label.read(h5_data->label ,dtype ,memspace_l, dataspace_l);
> >
> > it doesn't throw an error but the written string in the dataset is totally
> > messed-up.
> > Can anyone please tell me what is the write way to over-write my
> > variable-length strings or any alternative?
> > Thank you so much in advance
> When you write a variable-length string, you need to pass a pointer
> to the 'char *' for the write operation. Take a look at the testing code in
> test/tvlstr.c for examples of this in C.
>
> Quincey
>
>
>
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