output unicode

[eric]

On Mon, 2011-06-27 at 18:28 +0100, Jonathan Wakely wrote:
> On 27 June 2011 17:35, eric wrote:
> > On Mon, 2011-06-27 at 17:03 +0100, Jonathan Wakely wrote:
> >> On 27 June 2011 16:39, eric <fsshl@att.net> wrote:
> >> > Dear advanced c/g++ programers:
> >> >  after I copied and compiled last email's code
> >> >  I tested it, with your suggestion (put POSIX and C behind it), they
> >> > run (generate locale),
> >> > but
> >> > all test failed to make output file with size > 0
> >> > so if you can plz help again, and thank a lot in advance, Eric
> >> >
> >> > ------------------------------------------------------------
> >> > eric@eric-laptop:~/cppcookbook$ ./a.out
> >> > trying to access locale el_GR.utf8
> >> > Couldn't generate locale el_GR.utf8: locale::facet::_S_create_c_locale
> >> > name not valid
> >> > Error when writing to file
> >>
> >> As shown by 'locale -a' you don't have the el_GR.utf8 locale
> >> installed, so obviously this won't work.
> >>
> >> > eric@eric-laptop:~/cppcookbook$ ls -l -a unicode.txt
> >> > -rw-r--r-- 1 eric eric 0 2011-06-27 08:31 unicode.txt
> >> > eric@eric-laptop:~/cppcookbook$ ./a.out POSIX
> >> > trying to access locale POSIX
> >> > Generated locale C
> >> > Error when writing to file
> >> > eric@eric-laptop:~/cppcookbook$ ./a.out C
> >> > trying to access locale C
> >> > Generated locale C
> >> > Error when writing to file
> >> > eric@eric-laptop:~/cppcookbook$ ./a.out B
> >> > trying to access locale B
> >> > Couldn't generate locale B: locale::facet::_S_create_c_locale name not
> >> > valid
> >> > Error when writing to file
> >> > eric@eric-laptop:~/cppcookbook$
> >> > -------------------------------------------------------
> >>
> >>
> >> Did you ever answer the question of which OS you're using?
> >>
> >> Your gcc is using --enable-clocale=generic so doesn't support named
> >> locales in the C++ library.
> >>
> >> You could try running your code with a different global locale, i.e.
> >>
> >> LANG=en_US.utf8 ./a.out
> > ----------------------------------------------------------------
> > thanks your suggestion,
> > here is the result of my test on your suggestion and what kind of I use
> > ----
> > eric@eric-laptop:~/cppcookbook$ LANG=en_US.utf8 ./a.out
> > trying to access locale el_GR.utf8
> > Couldn't generate locale el_GR.utf8: locale::facet::_S_create_c_locale
> > name not valid
> > Error when writing to file
> > eric@eric-laptop:~/cppcookbook$ uname -r
> > 2.6.35-25-generic
> > eric@eric-laptop:~/cppcookbook$
> > (Ubuntu/linux 10.04 upgrade kernel to 2.6.35-25)
> 
> Your GCC seems to be using --enable-clocale=generic on GNU/Linux,
> which makes no sense.
> 
> What does 'gcc -v' print?
> 
> > I also modify from el_GR to en_US in en_US.utf8
> > then ./a.out (or LANG=en_US.utf8 ./a.out          , same error)
> > trying to access locale en_US.utf8
> > Couldn't generate locale en_US.utf8: locale::facet::_S_create_c_locale
> > name not valid
> > Error when writing to file
> 
> This will not work, you cannot load any named locale with your version of gcc.
> 
> My suggestion is to run the original program to write unicode to file
> (not this test program) with LANG=en_US.utf8
----------------------------------------------------------
eric@eric-laptop:~/cppcookbook$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/local/libexec/gcc/i686-pc-linux-gnu/4.5.2/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ./configure
Thread model: posix
gcc version 4.5.2 (GCC) 
eric@eric-laptop:~/cppcookbook$
-----------------------------------------------------------------
there indeed is another way to write unicode to outfile in my current g
++(similar as vc++ 2005),
but I like to know why 
outfile << ws2 << endl;

which according to book work in CodeWarrior, can not work in my system
(gcc/g++/linux)?(file length 0 or show 0 at outfile.good())
thanks your reply a lot in advance, Eric
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