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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