Cocos2d-x3.1中FileUtils的使用：本使用教程是基于HelloWorld的。仅仅需在HelloWorld的init()函数中加入例如以下代码

//头文件

#include "platform/CCFileUtils.h"//FileUtils头文件

#include <stdio.h>//使用文件操作

#include "deprecated/CCDictionary.h"//字典类

//下面各Test依次运行

//Test1:TestResolutionDirectories測试解决方式文件夹

//    auto sharedFileUtils = FileUtils::getInstance();//创建单例对象

//    std::string ret;

//    sharedFileUtils->purgeCachedEntries();//清理文件，查找缓存

//    auto _defaultSearchPathArray = sharedFileUtils->getSearchPaths();//获取一组查找路径，返回数组类型

//    std::vector<std::string> searchPaths = _defaultSearchPathArray;

//    searchPaths.insert(searchPaths.begin(),   "Misc");//加入查找路径

//    sharedFileUtils->setSearchPaths(searchPaths);//设置查找路径。能够是相对路径，也但是绝对路径

//    //<span style="font-family: Roboto, sans-serif; font-size: 14px; line-height: 22px;">获取包括资源查找顺序的array</span>

//    auto _defaultResolutionsOrderArray = sharedFileUtils->getSearchResolutionsOrder();

//    std::vector<std::string> resolutionsOrder = _defaultResolutionsOrderArray;

//    //插入查找顺序

//    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");

//    //<span style="font-family: Roboto, sans-serif; font-size: 14px; line-height: 22px;">设置包括资源查找路径的array</span>

//    sharedFileUtils->setSearchResolutionsOrder(resolutionsOrder);

//

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

//    {

//        auto filename = String::createWithFormat("test%d.txt",i);

//        ret = sharedFileUtils->fullPathForFilename(filename->getCString());//查找资源路径

//        log("%s -> %s",filename->getCString(),ret.c_str());//打印资源路径

//    }

//Test2:TestSearchPath 測试寻找路径

//    auto sharedFileUtils = FileUtils::getInstance();

//    std::string ret;

//    sharedFileUtils->purgeCachedEntries();

//    auto _defaultSearchPathArray = sharedFileUtils->getSearchPaths();

//    std::vector<std::string> searchPaths = _defaultSearchPathArray;

//    std::string writablePath = sharedFileUtils->getWritablePath();//改行以上同上

//    std::string fileName = writablePath + "external.txt";//设置可写文件路径

//    char szBuf[100] = "Hello Cocos2d-x";//写的内容

//    FILE* fp = fopen(fileName.c_str(), "wb");//打开路径下得文件

//    if(fp)

//    {

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

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

//        fclose(fp);

//        if (ret != 0) {

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

//        }

//    }

//    //加入查找路径

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

//    searchPaths.insert(searchPaths.begin()+1, "Misc/searchpath1");

//    searchPaths.insert(searchPaths.begin()+2, "Misc/searchpath2");

//    sharedFileUtils->setSearchPaths(searchPaths);//设置查找路径

//    //<span style="font-family: Roboto, sans-serif; font-size: 14px; line-height: 22px;">获取包括资源查找顺序的array</span>

//    auto _defaultResolutionsOrderArray = sharedFileUtils->getSearchResolutionsOrder();

//    std::vector<std::string> resolutionsOrder = _defaultResolutionsOrderArray;

//    resolutionsOrder.insert(resolutionsOrder.begin(), "resources-ipad");//插入查找顺序

//    sharedFileUtils->setSearchResolutionsOrder(resolutionsOrder);//设置查找顺序

//

//    for(int i = 1; i < 3; i++)

//    {

//        auto filename = String::createWithFormat("file%d.txt",i);//同上

//        ret = sharedFileUtils->fullPathForFilename(filename->getCString());

//        log("%s -> %s",filename->getCString(),ret.c_str());

//    }

//

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

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

//    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);//读上面写成功的文件

//            if(read > 0)

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

//            fclose(fp);

//        }

//    }

//Test3:TestFilenameLookup

//    auto sharedFileUtils = FileUtils::getInstance();

//

//    ValueMap dict;//ValueMap类型，相似于C++的Map，键值对

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

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

//    //<span style="font-family: Roboto, sans-serif; font-size: 14px; line-height: 22px;">设置文件查找词典，參数是替代文件名称的字典</span>

//    sharedFileUtils->setFilenameLookupDictionary(dict);

//

//    // Instead of loading carlitos.xcf, it will load grossini.png

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

//    this->addChild(sprite);

//

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

//    sprite->setPosition(Vec2(s.width/2, s.height/2));

//Test4:TestIsFileExist  測试文件是否存在

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

//    auto sharedFileUtils = FileUtils::getInstance();

//

//    Label* pTTF = nullptr;

//    bool isExist = false;

//

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

//

//    pTTF = Label::createWithSystemFont(isExist ?

"CloseSelected.png exists" : "CloseSelected.png doesn't exist", "", 20);

//    pTTF->setPosition(Vec2(s.width/2, s.height/3));

//    this->addChild(pTTF);

//

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

//    pTTF = Label::createWithSystemFont(isExist ?

"CloseNormal.png exists" : "CloseNormal.png doesn't exist", "", 20);//条件语句

//    pTTF->setPosition(Vec2(s.width/2, s.height/3*2));

//    this->addChild(pTTF);

//Test5:TextWritePlist 写Plist文件

    auto root = __Dictionary::create();//创建一个字典类对象

    auto string = __String::create("string element value");//创建一个String类对象

    root->setObject(string, "string element key");//root加入string类型键值对

    auto array = __Array::create();//创建一个Array对象

    auto dictInArray = __Dictionary::create();//创建一个字典类对象

    dictInArray->setObject(__String::create("string in dictInArray value 0"), "string in dictInArray key 0");//为字典类对象加入键值对

    dictInArray->setObject(__String::create("string in dictInArray value 1"), "string in dictInArray key 1");

    array->addObject(dictInArray);//将字典类对象加入到数组

    array->addObject(String::create("string in array"));//将String对象加入到数组

    auto arrayInArray = __Array::create();//创建Array类对象

    arrayInArray->addObject(__String::create("string 0 in arrayInArray"));//为Array类对象加入成员

    arrayInArray->addObject(__String::create("string 1 in arrayInArray"));

    array->addObject(arrayInArray);//将Array对象加入到array对象

    root->setObject(array, "array");//root加入Array类键值对

    auto dictInDict = __Dictionary::create();//创建字典类对象

    dictInDict->setObject(__String::create("string in dictInDict value"), "string in dictInDict key");//加入键值对

    //add boolean to the plist

    auto booleanObject = Bool::create(true);//创建Bool对象

    dictInDict->setObject(booleanObject, "bool");//加入Bool类型键值对

    //add interger to the plist

    auto intObject = Integer::create(1024);

    dictInDict->setObject(intObject, "integer");//加入Integer类型键值对

    //add float to the plist

    auto floatObject = Float::create(1024.1024f);

    dictInDict->setObject(floatObject, "float");//加入float类型键值对

    //add double to the plist

    auto doubleObject = Double::create(1024.123);//加入double类型键值对

    dictInDict->setObject(doubleObject, "double");

    root->setObject(dictInDict, "dictInDict, Hello World");//root加入字典类键值对

    // end with /

    std::string writablePath = FileUtils::getInstance()->getWritablePath();

    std::string fullPath = writablePath + "text.plist";

    //将plist文件写入到路径下得文件里

    if(root->writeToFile(fullPath.c_str()))

        log("see the plist file at %s", fullPath.c_str());

    else

        log("write plist file failed");

//    //创建TTF，显示plist文件路经

    auto label = Label::createWithTTF(fullPath.c_str(), "Thonburi.ttf", 30);

    this->addChild(label);

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

    label->setPosition(Vec2(winSize.width/2, winSize.height/3));

    //<span style="font-family: Roboto, sans-serif; font-size: 14px; line-height: 22px;">依据plist文件创建一个dictionary.</span>

    auto loadDict = __Dictionary::createWithContentsOfFile(fullPath.c_str());

    //依据键值。读取Dictionary的值，然后依据键再读取里面的值

    auto loadDictInDict = (__Dictionary*)loadDict->objectForKey("dictInDict, Hello World");

    auto boolValue = (__String*)loadDictInDict->objectForKey("bool");

    CCLOG("%s",boolValue->getCString());//控制台打印

    auto floatValue = (__String*)loadDictInDict->objectForKey("float");

    CCLOG("%s",floatValue->getCString());

    auto intValue = (__String*)loadDictInDict->objectForKey("integer");

    CCLOG("%s",intValue->getCString());

    auto doubleValue = (__String*)loadDictInDict->objectForKey("double");

    CCLOG("%s",doubleValue->getCString());

很多其它关于__Dictionary以及FileUtils可參考Cocos2d-x的API文档

http://cn.cocos2d-x.org/doc/cocos2d-x-3.0/d0/d1a/classcocos2d_1_1_____dictionary.html#a9b09179c67f6919b779b9aa656274e33