如何使std :: wofstream编写UTF-8? [英] How to make std::wofstream write UTF-8?

问题描述

我将std::wclog重定向到文件以登录程序:

I am redirecting std::wclog to a file for logging in my program:

std::wclog.rdbuf((new std::wofstream("C:\\path\\to\\file.log", std::ios::app))->rdbuf());

通过写入std::wclog进行记录:

std::wclog << "Schöne Grüße!" << std::endl;

令人惊讶的是，我发现该文件是用ANSI编写的. (这对于ofstream和clog是完全可以接受的，但是我曾期望wofstream和wclog产生某种unicode输出.)我也希望能够登录CYK语言(例如，用户输入)，因此是否有办法让wofstream生成UTF-8?开放模式标志似乎不提供此功能.

Surprisingly I found that the file is being written in ANSI. (This would be totally acceptable for ofstream and clog, but I had expected wofstream and wclog to produce some kind of unicode output.) I want to be able to log in CYK langugages as well (e.g. user input), so is there a way to get wofstream to produce UTF-8? The openmode flags seem not to provide for this.

(如果没有独立于平台的方式，则我使用的是Win7 + 64位.)

(If there isn’t a platform-independent way, I am on Win7+ 64-bit.)

上面的问题有一个错误.线

There is an error in the question above. The line

std::wclog << "Schöne Grüße!" << std::endl;

应该正确

std::wclog << L"Schöne Grüße!" << std::endl;

这只是为了演示我想做的事，在现实生活中，被写入wofstream的wstring来自提供翻译的类，例如

This is just to demonstrate what I want to do, in real life the wstring being written to the wofstream comes out of a class which provides for translation, like

std::wclog << _(L"Best regards") << std::endl;

其中

#define _(X) i18n::translate(X)

class i18n {
public:
    static std::wstring translate(const std::wstring&);
}

所以我要做的是使用wofstring将wstring写入std::wclog并将其放入文件中，并且该文件应采用UTF-8编码(无BOM).

So what I want to do is to write a wstring to std::wclog using an wofstring to put it into a file, and that file should be UTF-8 encoded (without BOM).

推荐答案

所有您需要使用的是UTF8文字，即:

All you need is to use a UTF8 literal, ie:

std::wclog << u8"Schöne Grüße!" << std::endl;

结果将是

SchöneGrüße！

Schöne Grüße!

如果您混合使用ASCII和UTF8文字，例如:

If you mix ASCII and UTF8 literals, eg:

std::wclog << "Schöne Grüße!" << std::endl << u8"Schöne Grüße!" << 

std :: endl;

std::endl;

将替换非ASCII字符.

the non-ASCII characters will be replaced.

Sch?ne Gr ?? e！
舍恩·格吕斯(SchöneGrüße)！

Sch?ne Gr??e!
Schöne Grüße!

Unicode文字已添加到C ++ 11中.它们首先在Visual Studio 2015中实现.

Unicode literals were added to C++ 11. They were first implemented in Visual Studio 2015. The String and Character Literals page describes the literals that are supported in Visual C++ at the moment.

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