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.
Thank you
Sahar
From: Quincey Koziol [via hdf-forum]
<[email protected]>
Sent: Tue, 8/16/2011 3:53pm
To: sghanavati <[email protected]>
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
_______________________________________________
Hdf-forum is for HDF software users discussion.
[hidden email]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
If you reply to this email, your message will be added to the
discussion below:
http://hdf-forum.184993.n3.nabble.com/over-writing-variable-length-string-in-dataset-using-hdf5-C-API-tp3219658p3259705.html
To unsubscribe from over-writing variable length string in
dataset using hdf5 C++ API, click here.
--
View this message in context:
http://hdf-forum.184993.n3.nabble.com/over-writing-variable-length-string-in-dataset-using-hdf5-C-API-tp3219658p3259968.html
Sent from the hdf-forum mailing list archive at Nabble.com._______________________________________________
Hdf-forum is for HDF software users discussion.
[email protected]
http://mail.hdfgroup.org/mailman/listinfo/hdf-forum_hdfgroup.org
