How Can I Safely Convert a UTF-8 String to a wstring in C ?

C : Converting a string to a wstring while Preserving Encoding

You are given a string s containing Japanese characters and wish to assign its contents to a wstring, ws. The task is to perform this assignment without introducing any encoding issues.

Solution:

Utilizing C 11 and above, this task can be accomplished solely with the standard library.

Step 1: Include Necessary Headers

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

Step 2: Create a converter

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;

This converter will handle the conversion between UTF-8 (the encoding of s) and UTF-16 (the encoding of ws).

Step 3: Convert the string to a wstring

std::wstring ws = converter.from_bytes(s);

Example:

std::string s = "おはよう";
std::wstring ws;

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
ws = converter.from_bytes(s);

Note:

• This solution assumes s contains valid UTF-8 encoded Unicode data.
• For more complex encoding scenarios, consider using std::codecvt_utf8.

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