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