如何使用 window api 转换字符集?(std::string与std::wstring的相互转换)

//宽字符转多字节
std::string W2A(const std::wstring& utf8)
{
    int buffSize = WideCharToMultiByte(CP_ACP, NULL, utf8.c_str(), -1, NULL, NULL, NULL, FALSE);
    char *gbk = new char[buffSize+1];
    memset(gbk, 0, buffSize + 1);
    WideCharToMultiByte(CP_ACP, NULL, utf8.c_str(), -1, gbk, buffSize, NULL, FALSE);
    std::string result(gbk);
    delete[] gbk;
    gbk = nullptr;
    return result;
}

//多字节转宽字符
std::wstring A2W(const std::string& gbk)
{
    int buffSize = MultiByteToWideChar(CP_ACP, NULL, gbk.c_str(), -1, NULL, NULL);
    wchar_t* utf8 = new wchar_t[buffSize+2];
    memset(utf8, 0, buffSize + 2);
    MultiByteToWideChar(CP_ACP, NULL, gbk.c_str(), -1, utf8, buffSize);
    std::wstring result(utf8);
    delete[] utf8;
    utf8 = nullptr;
    return result;
}
https://www.cnblogs.com/cheungxiongwei/p/7909864.html
//宽字符转多字节
std::string W2A(const std::wstring& utf8)
{
    int buffSize = WideCharToMultiByte(CP_ACP, NULL, utf8.c_str(), -1, NULL, NULL, NULL, FALSE);
    char *gbk = new char[buffSize+1];
    memset(gbk, 0, buffSize + 1);
    WideCharToMultiByte(CP_ACP, NULL, utf8.c_str(), -1, gbk, buffSize, NULL, FALSE);
    std::string result(gbk);
    delete[] gbk;
    gbk = nullptr;
    return result;
}

//多字节转宽字符
std::wstring A2W(const std::string& gbk)
{
    int buffSize = MultiByteToWideChar(CP_ACP, NULL, gbk.c_str(), -1, NULL, NULL);
    wchar_t* utf8 = new wchar_t[buffSize+2];
    memset(utf8, 0, buffSize + 2);
    MultiByteToWideChar(CP_ACP, NULL, gbk.c_str(), -1, utf8, buffSize);
    std::wstring result(utf8);
    delete[] utf8;
    utf8 = nullptr;
    return result;
}