C ++ std :: string和UTF-8 [英] C++ std::string and UTF-8

问题描述

我只是想在C ++中写一些简单的行到一个文本文件，但我想要它们以UTF-8编码。

I just want to write some few simple lines to a text file in C++, but I want them to be encoded in UTF-8. What is the easiest and simple way to do so?

推荐答案

UTF-8影响的唯一方法 std :: string 是 size（）， length（）

The only way UTF-8 affects std::string is that size(), length(), and all the indices are measured in bytes, not characters.

并且，如sbi所指出的，递增 std :: string 将逐个字节前进，而不是字符，因此它实际上可以指向一个多字节UTF-8编码点的中间。在标准库中没有提供支持UTF-8的迭代器，但是有一些可用的'Net。

And, as sbi points out, incrementing the iterator provided by std::string will step forward by byte, not by character, so it can actually point into the middle of a multibyte UTF-8 codepoint. There's no UTF-8-aware iterator provided in the standard library, but there are a few available on the 'Net.

如果你还记得，你可以把UTF- 8到 std :: string ，写入一个文件等等所有的通常的方式（我的意思是你将使用

If you remember that, you can put UTF-8 into std::string, write it to a file, etc. all in the usual way (by which I mean the way you'd use a std::string without UTF-8 inside).

您可能希望以字节顺序标记启动文件，以便其他程序将知道它是UTF-8。

You may want to start your file with a byte order mark so that other programs will know it is UTF-8.

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