string与wstring互转

 C++ Code 

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/// <summary>
///utf8转unicode
/// </summary>
bool Utf8ToUnicode( std::string& utf8_string, std::wstring& unicode_string)
{
    unicode_string = L"";
    if (utf8_string.compare("") == 0 )
    {
        return false;
    }

    const char *temp_utf8_string = utf8_string.c_str();
    int unicode_string_len = ::MultiByteToWideChar(CP_ACP, NULL, temp_utf8_string, strlen(temp_utf8_string), NULL, 0);
    if (0 == unicode_string_len )
    {
        return false;
    }

    wchar_t *temp_unicode_string = new wchar_t[unicode_string_len + 1];
    memset(temp_unicode_string, 0, sizeof(wchar_t) * (unicode_string_len + 1));
    if (0 == ::MultiByteToWideChar(CP_ACP, NULL, temp_utf8_string, strlen(temp_utf8_string), temp_unicode_string, unicode_string_len))
    {
        delete[] temp_unicode_string;
        temp_unicode_string = NULL;
        return false;
    }

    unicode_string = temp_unicode_string;
    delete[] temp_unicode_string;
    temp_unicode_string = NULL;

    return true;

}

/// <summary>
///unicode转utf-8
/// </summary>
bool UnicodeToUtf8( std::wstring& unicode_string, std::string& utf8_string)
{
    utf8_string = "";
    if (_wcsicmp(unicode_string.c_str(), L"") == 0 )
    {
        return false;
    }

    DWORD utf8_string_len = WideCharToMultiByte(CP_ACP, NULL, unicode_string.c_str(), -1, NULL, 0, NULL, FALSE);// WideCharToMultiByte的运用
    if (0 == utf8_string_len)
    {
        return false;
    }
    char *temp_utf8_string = new char[utf8_string_len + 1];
    memset(temp_utf8_string, 0, sizeof(char) * (utf8_string_len + 1));
    if (0 == WideCharToMultiByte (CP_ACP, NULL, unicode_string.c_str(), -1, temp_utf8_string, utf8_string_len, NULL, FALSE))
    {
        delete[] temp_utf8_string;
        temp_utf8_string = NULL;
        return false;
    }

    utf8_string = (std::string)temp_utf8_string;
    delete[] temp_utf8_string;
    temp_utf8_string = NULL;

    return true;
}