C ++将字符串（或char *）转换为wstring（或wchar_t *） [英] C++ Convert string (or char*) to wstring (or wchar_t*)

问题描述

  string s =おはよう; 
 wstring ws = FUNCTION（s，ws）; 
  

如何将s的内容分配给ws？

搜索google并使用了一些技术，但他们无法分配确切的内容。

解决方案

假设你的例子中的输入字符串是一个UTF-8编码的不是，通过它的外观，但让我们假设是为了这个解释:-)）表示一个你感兴趣的Unicode字符串，那么你的问题可以完全解决与标准库（C ++ 11

 >  #include< locale> 
 #include< codecvt> 
 #include< string> 
 
 std :: wstring_convert< std :: codecvt_utf8_utf16< wchar_t>>转换器; 
 std :: string narrow = converter.to_bytes（wide_utf16_source_string）; 
 std :: wstring wide = converter.from_bytes（narrow_utf8_source_string）; 
  

更长的在线可编译和可运行示例：

• http://coliru.stacked-crooked.com/a / b9324a6c8dcf830c （clang）


• 从上一个链接复制并粘贴代码，网址为： http ：//webcompiler.cloudapp.net/ （msvc）

注意：

正如评论中所指出的，并在 http://stackoverflow.com/ a / 17106065/6345 有时使用标准库在UTF-8和UTF-16之间转换可能会在不同平台上的结果中产生意想不到的差异。要获得更好的转化，请考虑上所述的 std :: codecvt_utf8 http://en.cppreference.com/w/cpp/locale/codecvt_utf8

string s = "おはよう";
wstring ws = FUNCTION(s, ws);

How would i assign the contents of s to ws?

Searched google and used some techniques but they can't assign the exact content. The content is distorted.

解决方案

Assuming that the input string in your example (おはよう) is a UTF-8 encoded (which it isn't, by the looks of it, but let's assume it is for the sake of this explanation :-)) representation of a Unicode string of your interest, then your problem can be fully solved with the standard library (C++11 and newer) alone.

The TL;DR version:

#include <locale>
#include <codecvt>
#include <string>

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
std::string narrow = converter.to_bytes(wide_utf16_source_string);
std::wstring wide = converter.from_bytes(narrow_utf8_source_string);

Longer online compilable and runnable example:

• http://coliru.stacked-crooked.com/a/b9324a6c8dcf830c (clang)
• copy-and-paste the code from the previous link at http://webcompiler.cloudapp.net/ (msvc)

Note:

As pointed out in the comments and explained in http://stackoverflow.com/a/17106065/6345 there are cases when using the standard library to convert between UTF-8 and UTF-16 might give unexpected differences in the results on different platforms. For a better conversion, consider std::codecvt_utf8 as described on http://en.cppreference.com/w/cpp/locale/codecvt_utf8

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