读/写unicode c ++ [英] Read/write unicode c++

问题描述

很遗憾，这是本周第三次发布问题。

我必须用unicode编码（或UTF8）将文本写入文件。


这是我所做的：

创建 wofstream mystream; 然后我把一个 wstring 在它像这样 mystream< Lhello world;

第一个问题：流在我的案例中使用什么样的编码？

其次，我想加载我的新文件，但如何读取行？ ifstream 的 getline 无法正常工作，因为行最后明显损坏。

wstream 的类型 和 wstring 是平台相关的：在Windows上为2个字节，在某些（所有？）Linux上为4个字节。所以你最终会写'Unicode'，但确切地说，Unicode是受许多变量。你可以写UTF32 / UCS4，你最后可能会得到UTF16 / UCS2。

如果要使用特定的，受控的编码（例如，UTF8或UCS-2LE与UCS-2BE来控制字节序）编写， iconv 。您还可以使用 std :: locale 到 imbue 流，请参阅 http：// stackoverflow。 com / a / 1275260/105929 。

Sadly this is the third time this week I have to post a question.

I have to write text to a file with unicode encoding (or UTF8).
This is what I do:

creating wofstream mystream; and then I put a wstring in it like this mystream << L"hello world";

First question: what kind of encoding the stream uses in my case?

Secondly, I want to load my new file, but how to read the lines? The ifstream's getline is not working because the line ends up ruined obviously.

解决方案

wchar_t, the type that backs wstream and wstring, is platform dependent: 2 bytes on Windows, 4 bytes on some (all?) Linux. So you will end up writing 'Unicode', but exactly which Unicode is subject to many variables. You may write UTF32/UCS4, you may end up with UTF16/UCS2.

If you want to write using a specific, well controlled encoding (eg. UTF8, or UCS-2LE vs. UCS-2BE to control endianess) then you need something like iconv. You can also use std::locale to imbue a stream, see http://stackoverflow.com/a/1275260/105929.

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