使用多字节字符集的MFC应用程序中的UTF-8文本

#include <windows.h>
#include <string>

std::wstring UTF8ToWString(const std::string& str) {
    int len = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);
    std::wstring wstr(len, 0);
    MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, &wstr[0], len);
    return wstr;
}

std::string WStringToUTF8(const std::wstring& wstr) {
    int len = WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, NULL, 0, NULL, NULL);
    std::string str(len, 0);
    WideCharToMultiByte(CP_UTF8, 0, wstr.c_str(), -1, &str[0], len, NULL, NULL);
    return str;
}

#include <fstream>
#include <vector>
#include "uchardet/uchardet.h"

std::string ReadFileWithEncoding(const std::string& filename) {
    std::ifstream file(filename, std::ios::in | std::ios::binary);
    if (!file.is_open()) {
        throw std::runtime_error("Cannot open file");
    }

    std::vector<char> buffer((std::istreambuf_iterator<char>(file)), std::istreambuf_iterator<char>());
    uchardet_t ud = uchardet_new();
    uchardet_handle_data(ud, buffer.data(), buffer.size());
    uchardet_data_end(ud);

    std::string encoding = uchardet_get_charset(ud);
    uchardet_delete(ud);

    if (encoding == "UTF-8") {
        return std::string(buffer.begin(), buffer.end());
    } else {
        // Convert to UTF-8 if necessary
        // ...
    }
}