How Can I Perform Cross-Platform UTF-8 and Wide Character String Conversion in C ?

UTF-8 Character Conversion in STL

In C development, the need often arises to convert between UTF-8 and wide char strings in a platform-agnostic manner. While specific operating systems may offer dedicated functions like MultiByteToWideChar and WideCharToMultiByte, it becomes necessary to explore cross-platform solutions for portable code.

The C Standard Library provides a robust solution through C 11's standardized boost libraries. By leveraging the std::wstring type (now referred to as std::u16string), conversions can be achieved with the following code:

UTF-8 to UTF-16

std::string source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::u16string dest = convert.from_bytes(source);

UTF-16 to UTF-8

std::u16string source;
...
std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
std::string dest = convert.to_bytes(source);

This approach offers a flexible and portable method for character conversion, catering to various use cases in cross-platform development.

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