Win32 : Katakana to Hiragana conversion by LCMapStringEx()

win32-katakana-to-hiragana-conversion-by-lcmapstringex.cpp

#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <tchar.h>
#include <wtypes.h>

#include <vector>
#include <string>
#include <iostream>


std::wstring katakanaToHiragana(const std::wstring& str) {
    const auto* s = str.c_str();
    const auto  l = str.size();

    const int requestBufLen = LCMapStringEx(
          LOCALE_NAME_USER_DEFAULT
        , LCMAP_HIRAGANA
        , s
        , l
        , nullptr
        , 0
        , nullptr
        , nullptr
        , 0
    );

    std::vector<wchar_t> buf(requestBufLen);

    const int result = LCMapStringEx(
          LOCALE_NAME_USER_DEFAULT
        , LCMAP_HIRAGANA
        , s
        , l
        , buf.data()
        , buf.size()
        , nullptr
        , nullptr
        , 0
    );

    return buf.data();
}


int main() {
    _tsetlocale(LC_ALL, _T(""));

    const std::wstring katakana = L"アカサタナ";
    const auto hiragana = katakanaToHiragana(katakana);

    std::wcout << katakana << std::endl;
    std::wcout << hiragana << std::endl;
}