How to Convert C Strings to Wstrings?

Converting a C String to a Wstring

In C , converting a string (or char) to a wstring (or wchar_t) allows you to work with wide characters, which are used to represent non-ASCII characters like Japanese Kanji or Cyrillic characters.

Using the Standard Library

For conversions between UTF-8 and UTF-16, the standard library provides a comprehensive solution:

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

std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>> converter;
std::wstring wstr = converter.from_bytes("おはよう");

Example

The following example demonstrates this conversion:

#include <iostream>

int main() {
  std::string a = "Привет всем!";
  std::wstring b = std::wstring_convert<std::codecvt_utf8_utf16<wchar_t>>().from_bytes(a);

  std::cout << b << std::endl;
  return 0;
}

Output:

Привет всем!

Legacy Approach (Deprecated)

Note that the codecvt header is deprecated in C 17. For systems with no replacement library, you can use the legacy approach:

#include <wchar.h>

wchar_t* wcs = (wchar_t*)MultiByteToWideChar(CP_UTF8, 0, a.c_str(), -1, NULL, 0);

However, this method may not handle certain Unicode characters correctly.

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