Cocos2d-x3.0 文件处理

1、从文件中读取

   auto sharedFileUtils = FileUtils::getInstance();

        std::string ret;

        sharedFileUtils->purgeCachedEntries();

        std::vector<std::string> searchPaths = sharedFileUtils->getSearchPaths();

        searchPaths.insert(searchPaths.begin(), "Misc");

        sharedFileUtils->setSearchPaths(searchPaths);

        std::vector<std::string> resolutionsOrder = sharedFileUtils->getSearchResolutionsOrder();

        resolutionsOrder.insert(resolutionsOrder.begin(), "resources-ipadhd");

        resolutionsOrder.insert(resolutionsOrder.begin()+1, "resources-ipad");

        resolutionsOrder.insert(resolutionsOrder.begin()+2, "resources-widehd");

        resolutionsOrder.insert(resolutionsOrder.begin()+3, "resources-wide");

        resolutionsOrder.insert(resolutionsOrder.begin()+4, "resources-hd");

        resolutionsOrder.insert(resolutionsOrder.begin()+5, "resources-iphone");

        sharedFileUtils->setSearchResolutionsOrder(resolutionsOrder);

        for (int i = 1; i < 7; i++) {

            auto filename =StringUtils::format("test%d.txt",i);

            //获取文件路径

            ret = sharedFileUtils->fullPathForFilename(filename.c_str());

            //获取文件里的字符串

            std::string st = FileUtils::getInstance()->getStringFromFile(filename);

            log("%s -> %s",filename.c_str(),st.c_str());

        }

向本地写入和读取

        auto sharedFileUtils = FileUtils::getInstance();

        std::string ret;

        sharedFileUtils->purgeCachedEntries();

        std::vector<std::string> searchPaths = sharedFileUtils->getSearchPaths();

        std::string writablePath = sharedFileUtils->getWritablePath();

        std::string fileName = writablePath + "external1.txt";

        char szBuf[100] = "Hello Cocos2d-xrewrwe!";

        /*向本地写入*/

        FILE* fp = fopen(fileName.c_str(), "wb");

        if (fp) {

            size_t ret = fwrite(szBuf, 1, strlen(szBuf), fp);

            CCASSERT(ret != 0, "fwrite function returned zero value");

            fclose(fp);

            if (ret != 0)

                log("Writing file to writable path succeed.");

        }

        /**********************************/

        searchPaths.insert(searchPaths.begin(), writablePath);

        sharedFileUtils->setSearchPaths(searchPaths);

        //Get external.txt from writable path

        std::string fullPath = sharedFileUtils->fullPathForFilename("external1.txt");

        log("external file path = %s",fullPath.c_str());

        /*读取文件*/

        if (fullPath.length() > 0) {

            fp = fopen(fullPath.c_str(), "rb");

            if (fp) {

                char szReadBuf[100] = {0};

                size_t read = fread(szReadBuf, 1, strlen(szBuf), fp);

                if (read > 0)

                    log("The content of file from writable path: %s",szReadBuf);

                fclose(fp);

            }

        }

推断文件是否存在

        auto s = Director::getInstance()->getWinSize();

        auto sharedFileUtils = FileUtils::getInstance();

        Label* pTTF;

        bool isExist = false;

        //推断文件是否存在

        isExist = sharedFileUtils->isFileExist("grossini.png");

        pTTF = Label::createWithSystemFont(isExist ? "Images/grossini.png exists" : "Images/grossini.png doesn't exist", "", 20);

        pTTF->setPosition(Point(s.width / 2, s.height / 2));

        this->addChild(pTTF);

auto s = Director::getInstance()->getWinSize();

        auto sharedFileUtils = FileUtils::getInstance();

        ValueMap dict;

        dict["grossini.bmp"] = Value("grossini.png");

        dict["grossini.xcf"] = Value("grossini.png");

        sharedFileUtils->setFilenameLookupDictionary(dict);

        auto sprite = Sprite::create("grossini.bmp");

        this->addChild(sprite);

        sprite->setPosition(Point(s.width / 2, s.height / 2));