Unicode I / O. [英] Unicode I/O
问题描述
以下std c ++程序不会输出unicode
字符。： -
％。/ a.out
en_US.UTF-8
无限：
％cat unicode.cpp
#include< iostream>
#include< string>
#include< locale>
int main（）
{
std :: wstring ws = L" Infinity：\ u221E";
std :: locale loc（""）;
std :: cout<< loc.name（）<< " " << std :: endl;
std :: wcout.imbue（loc）;
std :: wcout<< ws<< std :: endl;
}
％locale
LANG = en_US
LC_CTYPE =" en_US.UTF -8"
LC_NUMERIC =" en_US.UTF-8"
LC_TIME =" en_US.UTF-8"
LC_COLLATE =" ; en_US.UTF-8"
LC_MONETARY =" en_US.UTF-8"
LC_MESSAGES =" en_US.UTF-8"
LC_PAPER =" en_US.UTF-8"
LC_NAME =" en_US.UTF-8"
LC_ADDRESS =" en_US.UTF-8"
LC_TELEPHONE =" en_US.UTF-8"
LC_MEASUREMENT =" en_US.UTF-8"
LC_IDENTIFICATION =" en_US.UTF-8" ;
LC_ALL = en_US.UTF-8
我缺少什么？请帮助。我试图用c ++来理解unicode i / o
来修改一个应用程序以用于unicode输入。
谢谢你，
Himanshu
hi ***********@gmail.com 写道：
以下std c ++程序不输出unicode
字符。：
％。/ a.out
en_US .UTF-8
无限：
％cat unicode.cpp
#include< iostream>
#include< string>
#include< locale>
int main（）
{
std :: wstring ws = L" Infinity：\ u221E";
std :: locale loc（""）;
std :: cout << loc.name（）<< " " << std :: endl;
std :: wcout.imbue（loc）;
std :: wcout<< ws<< std :: endl;
}
当前C ++标准不包含Unicode支持，
在C ++ 0x中，会有Unicode支持。
我对于语言环境很虚伪，
但你可以查看Boost utf8_codecvt_facet ，效果很好。
我肯定没有\ u用C ++转义字符，
而Java有这个。
HTH。
-
最好的问候
Barry
13 avr，10：58，Barry< dhb2 ... @ gmail.comwrote：
himanshu.g ... @ gmail.com写道：
以下std c ++程序不输出unicode
字符。： -
％。/ a.out
en_US.UTF-8
无限：
％cat unicode.cpp
#include< iostream>
#include< string>
#include< locale>
int main（）
{
std :: wstring ws = L" Infinity：\ u221E";
std :: locale loc（""）;
std :: cout << loc.name（）<< " " << std :: endl;
std :: wcout.imbue（loc）;
std :: wcout<< ws<< std :: endl;
}
当前C ++标准不包括Unicode支持，
完整的Unicode支持不存在，但有一些事情。
L" \ u221E"，例如，保证作为无穷大符号
一个实现定义的默认宽字符编码，
假设它存在。并且Posix（不是C ++）保证
语言环境en_US.UTF-8。使用UTF-8编码。所以至少，从实现的质量来看，
，如果没有其他的话，
他应该从编译器得到警告（即
字符请求的字符不可用），抛出
std :: runtime_error来表示所请求的语言环境不支持
，或者他想要的角色，正确编码为
UTF-8。 （从技术上讲，locale（）的行为是定义的实现
，我不认为它允许提出
异常。但是在这种情况下，使用Posix语言环境命名约定的
系统下的实现不应该返回" en_US.UTF-8"作为名称，但是相当像
" C" ;.）
在他的情况下我会做什么，对于初学者来说，是做一个十六进制转储
wstring'的缓冲区，看看究竟L" \ u221E"编码。
除此之外：如果它被编码为某个默认字符指示
a不支持的字符，那么他应该提交错误报告
与编译器，请求警告，否则，他应该为文件库提供错误报告，表明区域设置
不按指定工作。
-
James Kanze（GABI软件）电子邮件：ja ********* @ gmail.com
conseils eninformatiqueorientéeobjet/
Beratung in objektorientierter Datenverarbeitung
9placeSémard，78210 St.-Cyr-l''coco，France，+ 33（0） 1 30 23 00 34
4月13日，08：49，himanshu.g ... @ gmail.com写道：
* *以下std c ++程序不输出unicode
字符。： -
％。/ a.out
en_US.UTF-8
无限：
％cat unicode.cp p $ />
#include< iostream>
#include< string>
#include< locale>
int main（）
{
* * std :: wstring ws = L" Infinity：\ u221E";
* * std :: locale loc（""）;
* * std :: cout<< loc.name（）<< " " << std :: endl;
* * std :: wcout.imbue（loc）;
* * std :: wcout<< ws<< std :: endl;
}
[snip]
>
我缺少什么？请帮助。我试图在c ++中理解unicode i / o
来修改应用程序以用于unicode输入。
我不知道你的问题的解决方案，但首先，我会先写一个
到一个文件，而不是控制台。使用十六进制编辑器检查文件 - 最好是
- 并验证它是否采用正确的格式。如果它是
，那么C ++部分可能没问题，你应该在其他地方找一个解决方案
。
/彼得
Hi,
The following std c++ program does not output the unicode
character.:-
%./a.out
en_US.UTF-8
Infinity:
%cat unicode.cpp
#include<iostream>
#include<string>
#include<locale>
int main()
{
std::wstring ws = L"Infinity: \u221E";
std::locale loc("");
std::cout << loc.name( ) << " " << std::endl;
std::wcout.imbue(loc);
std::wcout << ws << std::endl;
}
%locale
LANG=en_US
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8
What am I missing? Kindly help. I am trying to understand unicode i/o
in c++ to modify an application to work for unicode input.
Thank You,
Himanshu
hi***********@gmail.com wrote:Hi,
The following std c++ program does not output the unicode
character.:-
%./a.out
en_US.UTF-8
Infinity:
%cat unicode.cpp
#include<iostream>
#include<string>
#include<locale>
int main()
{
std::wstring ws = L"Infinity: \u221E";
std::locale loc("");
std::cout << loc.name( ) << " " << std::endl;
std::wcout.imbue(loc);
std::wcout << ws << std::endl;
}
Unicode support is not included by current C++ standard,
In C++0x, there will be Unicode support.
I''m quite dummy about locale things,
But you can check Boost utf8_codecvt_facet, which works very well.
I''m sure there''s no "\u" escape character in C++,
while Java has this.
HTH.
--
Best Regards
Barry
On 13 avr, 10:58, Barry <dhb2...@gmail.comwrote:himanshu.g...@gmail.com wrote:
The following std c++ program does not output the unicode
character.:-
%./a.out
en_US.UTF-8
Infinity:
%cat unicode.cpp
#include<iostream>
#include<string>
#include<locale>
int main()
{
std::wstring ws = L"Infinity: \u221E";
std::locale loc("");
std::cout << loc.name( ) << " " << std::endl;
std::wcout.imbue(loc);
std::wcout << ws << std::endl;
}
Unicode support is not included by current C++ standard,Full Unicode support isn''t there, but there are a few things.
L"\u221E", for example, is guaranteed to be the infinity sign in
an implementation defined default wide character encoding,
supposing it exists. And Posix (not C++) guarantees that the
locale "en_US.UTF-8" uses UTF-8 encoding. So at the very least,
from a quality of implementation point of view, if nothing else,
he should either get a warning from the compiler (that the
character requested character isn''t available), throw
std::runtime_error to indicate that the requested locale isn''t
supported, or the character he wants, correctly encoded in
UTF-8. (Technically, the behavior of locale("") is
implementation defined, and I don''t think it''s allowed to raise
an exception. But in this case, an implementation under a
system using the Posix locale naming conventions shouldn''t
return "en_US.UTF-8" as the name, but rather something like
"C".)
What I would do in his case, for starters, is do a hex dump of
the wstring''s buffer, to see exactly how L"\u221E" is encoded.
Beyond that: if it''s encoded as some default character indicated
a non-supported character, then he should file an error report
with the compiler, requesting a warning, otherwise, he should
file an error report for the library, indicating that locales
aren''t working as specified.
--
James Kanze (GABI Software) email:ja*********@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientierter Datenverarbeitung
9 place Sémard, 78210 St.-Cyr-l''école, France, +33 (0)1 30 23 00 34
On 13 Apr., 08:49, himanshu.g...@gmail.com wrote:Hi,
* * The following std c++ program does not output the unicode
character.:-
%./a.out
en_US.UTF-8
Infinity:
%cat unicode.cpp
#include<iostream>
#include<string>
#include<locale>
int main()
{
* *std::wstring ws = L"Infinity: \u221E";
* *std::locale loc("");
* *std::cout << loc.name( ) << " " << std::endl;
* *std::wcout.imbue(loc);
* *std::wcout << ws << std::endl;
}[snip]
>
What am I missing? Kindly help. I am trying to understand unicode i/o
in c++ to modify an application to work for unicode input.I don''t know the solution to your problem, but first of all, I''d write
to a file first, and not to the console. Examine the file - preferably
with a hex editor - and verify if it is in the proper format. If it
is, the C++ part might be okay, and you should look for a solution
somewhere else.
/Peter
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