cocos2d-x 3.0 parse xml used tinyxml

1.bellows is cocos2d-x 3.0 parse xml from file code,because i writed some error parse code,and fixed it.

bool RuntimeProfile::init(){
    reset();

    std::string currentLanguageCode = Application::getInstance()->getCurrentLanguageCode();
    if (currentLanguageCode == "zh")
        currentLanguageCode = "values-zh-rCN";

    unsigned char* buf = 0;
    do{

        if (currentLanguageCode.empty())
            break;

        try{
            std::string file_path = FileUtils::getInstance()->fullPathForFilename("locales/" + currentLanguageCode + "/strings.xml");
            if (!FileUtils::getInstance()->isFileExist(file_path))
                break;

            ssize_t size;
            buf = FileUtils::getInstance()->getFileData(file_path, "r", &size);
            if (!buf)
                break;

            tinyxml2::XMLDocument* myDocment = new tinyxml2::XMLDocument();

            if (tinyxml2::XML_NO_ERROR != myDocment->Parse((const char*)buf, size)){
                break;
            }

            tinyxml2::XMLElement* rootElement = myDocment->RootElement();
            if (!rootElement)
                break;

            tinyxml2::XMLElement* childElement = rootElement->FirstChildElement("string");

            const char* key = NULL;

            while (childElement) {
                key = childElement->Attribute("name");
                if (key && key[0])
                    mLangDictory[key] = childElement->GetText();

                childElement = childElement->NextSiblingElement("string");
            }
        }
        catch (...){
        }

    } while (false);

    CC_SAFE_FREE(buf);

    return true;
}