数据持久化

     首先是cocos2d-x自己封闭的CCUserDefault跨平台的文件存储类，它是用的xml格式，具体操作非常类似于应用开发的ini文件，可操作性不是很强，如果存取比较复杂的数据，那就得自己动手去解析一个字符串，下面是示例代码，基本一看就懂：

void UserDefaultTest::doTest()
{
    CCLOG("********************** init value ***********************");

    // set default value

    CCUserDefault::sharedUserDefault()->setStringForKey("username", "value1");
    CCUserDefault::sharedUserDefault()->setIntegerForKey("integer", 10);
    CCUserDefault::sharedUserDefault()->setFloatForKey("float", 2.3f);
    CCUserDefault::sharedUserDefault()->setDoubleForKey("double", 2.4);
    CCUserDefault::sharedUserDefault()->setBoolForKey("bool", true);

    // print value

    string ret = CCUserDefault::sharedUserDefault()->getStringForKey("string");
    CCLOG("string is %s", ret.c_str());

    double d = CCUserDefault::sharedUserDefault()->getDoubleForKey("double");
    CCLOG("double is %f", d);

    int i = CCUserDefault::sharedUserDefault()->getIntegerForKey("integer");
    CCLOG("integer is %d", i);

    float f = CCUserDefault::sharedUserDefault()->getFloatForKey("float");
    CCLOG("float is %f", f);

    bool b = CCUserDefault::sharedUserDefault()->getBoolForKey("bool");
    if (b)
    {
        CCLOG("bool is true");
    }
    else
    {
        CCLOG("bool is false");
    }
    
    //CCUserDefault::sharedUserDefault()->flush();

    CCLOG("********************** after change value ***********************");

    // change the value

    CCUserDefault::sharedUserDefault()->setStringForKey("username", "daoxwj");
    CCUserDefault::sharedUserDefault()->setIntegerForKey("integer", 11);
    CCUserDefault::sharedUserDefault()->setFloatForKey("float", 2.5f);
    CCUserDefault::sharedUserDefault()->setDoubleForKey("double", 2.6);
    CCUserDefault::sharedUserDefault()->setBoolForKey("bool", false);

    CCUserDefault::sharedUserDefault()->flush();

    // print value

    ret = CCUserDefault::sharedUserDefault()->getStringForKey("string");
    CCLOG("string is %s", ret.c_str());

    d = CCUserDefault::sharedUserDefault()->getDoubleForKey("double");
    CCLOG("double is %f", d);

    i = CCUserDefault::sharedUserDefault()->getIntegerForKey("integer");
    CCLOG("integer is %d", i);

    f = CCUserDefault::sharedUserDefault()->getFloatForKey("float");
    CCLOG("float is %f", f);

    b = CCUserDefault::sharedUserDefault()->getBoolForKey("bool");
    if (b)
    {
        CCLOG("bool is true");
    }
    else
    {
        CCLOG("bool is false");
    }
}

    很明显，这个xml文件d是明文的，如果你想稍微加密下，可以考虑用Base64，加密之后对数据做些处理，然后解密之前可以做些逆处理，这样貌似保险一点点。