Thank you Prof Brian , Duncan .
Let me try that out,

Thanks,
Sandip


On Tue, Jan 21, 2014 at 9:14 PM, Prof Brian Ripley <ripley@stats.ox.ac.uk>wrote:

> On 22/01/2014 00:08, Duncan Murdoch wrote:
>
>> On 14-01-21 5:41 PM, Sandip Nandi wrote:
>>
>>> Hi ,
>>>
>>> I am using C interface of R . If a unicode string is read , in what
>>> format
>>> I could pass it back to R ?
>>> I was trying to use the following
>>>
>>>   tpStr = ( char *)val;
>>>   SET_STRING_ELT(innerList  , 0, mkChar(tpStr));
>>>
>>> It does not work .
>>>
>>> If I pass it back from as RAW format to R , what package is there to read
>>> it ? I mean package for interpreting RAW data .
>>>
>>
>> There are a number of encodings for Unicode.  Most Unix systems use
>> UTF-8, Windows uses UTF-16 for some things, etc.
>>
>> If your string is known to be in UTF-8 that's easiest:  just use
>> mkCharCE instead of mkChar, as described in Writing R Extensions.  If it
>> is in UTF-16 you might have more trouble because of possible embedded 0
>> bytes.  Translate to UTF-8 first using C facilities like
>> WideCharToMultibyte.
>>
>
> Which is Windows-only (and 'wide char' differs by platform, including if
> it is known to be any Unicode encoding)   All platforms have Riconv: see
> 'Writing R Extensions'. C11 has other ways to do this, but they are not
> widely implemented.
>
> --
> Brian D. Ripley,                  ripley@stats.ox.ac.uk
> Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
> University of Oxford,             Tel:  +44 1865 272861 (self)
> 1 South Parks Road,                     +44 1865 272866 (PA)
> Oxford OX1 3TG, UK                Fax:  +44 1865 272595
>

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