Hi Andre,

I try my best from the available information (no code example provided). I 
suspect that the argument provided to the H5Acreate_by_name call is either not 
provided or not recognised as a valid name for an attribute. So you have to 
check that you provide a buffer containing a valid and not-yet-existing name 
for the attribute.
Once you've created the attribute you should be able to write the xml string to 
it using H5Awrite().

Kind regards,
Gerco



Gerco de Jager  | Software Engineer | MARIN Software Group
MARIN | T +31 317 49 33 51 | mailto:[email protected] | http://www.marin.nl

MARIN news: 
http://www.marin.nl/web/News/News-items/Join-the-Floating-Future-seminar-March-7-2018.htm

-----Original Message-----
From: Hdf-forum [mailto:[email protected]] On Behalf Of gmail
Sent: donderdag 11 januari 2018 2:09
To: [email protected]
Subject: [Hdf-forum] xml string attribute write error

Greetings all,

A colleague and I are getting an error when trying to write a string, which is 
fully formed xml snippet, as an attribute in a hdf5 file.

Checks we have done:

1 - manually write the string and with .compare, this manual string matches 
exactly the string we have read from an xml buffer.

1a - the manual string can be written to an attribute

1b - the original string raises an error when we write

2 - we have used .copy to make a new copy of the string from the xml buffer

2a - this copy also fails to write with the same error

3 - we removed all new-line characters from the string - this did not help

4 - we tried the .substr method to chop the string to small pieces, this also 
did not help (all pieces failed to write)

5 - we tried the first 5 characters of the string, which do not have any 
special characters - still fails

The fact that 1a succeeds means we are probably missing something simple.

The error is

HDF5-DIAG: Error detected in HDF5 (1.8.16) MPI-process 1:
  #000: H5A.c line 334 in H5Acreate_by_name(): no attribute name
    major: Invalid arguments to routine
    minor: Bad value


I am hoping someone here has had and fixed the same problem, as we are very 
stuck.

Thanks,
Andre






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