On 26 June 2011 16:09, eric wrote:
> On Sun, 2011-06-26 at 16:52 +0200, Axel Freyn wrote:
>> Hi Eric,
>>
>> On Sun, Jun 26, 2011 at 07:15:54AM -0700, eric wrote:
>> > Dear c/g++ advanced programers:
>> > I copied and tried to test a piece simple code which is used for
>> > (Hardcoding a Unicode String) from the book (
>> > C++ Cookbook) by D. Ryan Stephens, Christopher Diggins, Jonathan
>> > Turkanis, and Jeff Cogswell
>> > at Chapter 13, Internationalization, section 1: Hardcoding a Unicode
>> > String
>> > example 13-1, it can compile and run on my g++4.5.2, but I don't quite
>> > satisfy its result
>> >
>> > --------------------
>> > //Example 13-1 Hardcoding a Unicode string
>> > #include <iostream>
>> > #include <fstream>
>> > #include <string>
>> >
>> > using namespace std;
>> >
>> > int main() {
>> >
>> > // Create some strings with Unicode characters
>> > wstring ws1 = L"Infinity: \u221E";
>> > wstring ws2 = L"Euro: \u0128";
>> >
>> > wchar_t w[] = L"Infinity: \u221E";
>> >
>> > wofstream out("tmp\\unicode.txt");
>> > out << ws2 << endl;
>> > wcout << ws2 << endl;
>> > }
>> As far as I know, you should absolutely NOT use non-ascii characters in
>> input/output operations without explicitely specifying the
>> encoding/localization to be used.
>> In your example, I would thus propose to add after the "wofstream
>> out..." a line like
>> out.imbue(locale("de_DE.UTF-8"));
>> which defines the encoding.
>> The following works for me:
>>
>> #include <iostream>
>> #include <fstream>
>> #include <string>
>> using namespace std;
>> int main() {
>> wstring ws2 = L"Euro:\x20ac";
>> wofstream out("unicode.txt");
>> out.imbue(locale("de_DE.UTF-8"));
>> out << ws2<< endl;
>> }
>>
>> (besides, the Euro-symbol in Unicode is \x20ac)
>>
>>
>> In addition, you SHOULD add error-checking to your code. If you add
>> if(not out.good())
>> cerr << "Error while writing " << endl;
>> AFTER the line which writes into the file, you'll get an error message ....
>>
>> HTH,
>>
>> Axel
>>
> ---------------------------
> Dear Axel:
> Thanks your reply.
> I copied your code and tried on my system. It compile and run, but
> reponse by
> ---------------------------
> root@eric-laptop:/home/eric/cppcookbook# ./a.out
> terminate called after throwing an instance of 'std::runtime_error'
> what(): locale::facet::_S_create_c_locale name not valid
> Aborted
> --------
> Do you konw what can be improved more?
You probably don't have the de_DE.UTF-8 locale installed. Try running
'locale -a' to see which locales you have installed and pick a utf8
one, e.g. en_US.utf8
> looking to see your(or any advancer's) suggestion again, thanks a lot
> in advance, Eric
That word still doesn't mean anything.
