MacOS 获取系统语言

std::string GetLocaleLanguage()
{
	// defaults read .GlobalPreferences AppleLanguages | tr -d ["()\\""][:space:]
    std::string lpath = GetManagerDataPath() + "lang.txt";
    std::string  cmd = R"(defaults read .GlobalPreferences AppleLanguages | tr -d ["()\""][:space:] > )";
    cmd += lpath;
    system(cmd.c_str());
    std::string _language = "English";

    FILE * fp = fopen(lpath.c_str(), "r");
    LOG_STREAM_MESSAGE << "open:" << lpath;
    char buf[10] = { 0 };
    if (fp)
    {
        if (fgets(buf, sizeof buf, fp))
        {
            LOG_STREAM_MESSAGE << "language file:" << buf;
            int ret = strncmp(buf, "zh-Han", std::min<size_t>(strlen(buf), strlen("zh-Han")));

            if (ret == 0)
            {
                _language = "Chinese";
            }
        }
        fclose(fp);
    }
    else
    {
        LOG_STREAM_MESSAGE << "fp == null! " << lpath << " not Found";
    }
    
    remove(lpath.c_str());
    return _language;
}