今天白白跟大家分享一下cocos2dx中游戏的存储及需要注意的事项
cocos2dx中自带了存储类:CCUserDefault ,倘若需要存储的数据量教大的话,建议使用数据库来存储
现在先给大家看一下CCUserDefault的API
Public Member Functions ~CCUserDefault () bool getBoolForKey (const char *pKey, bool defaultValue=false) Get bool value by key, if the key doesn't exist, a default value will return. int getIntegerForKey (const char *pKey, int defaultValue=0) Get integer value by key, if the key doesn't exist, a default value will return. float getFloatForKey (const char *pKey, float defaultValue=0.0f) Get float value by key, if the key doesn't exist, a default value will return. double getDoubleForKey (const char *pKey, double defaultValue=0.0) Get double value by key, if the key doesn't exist, a default value will return. std::string getStringForKey (const char *pKey, const std::string &defaultValue="") Get string value by key, if the key doesn't exist, a default value will return. void setBoolForKey (const char *pKey, bool value) Set bool value by key. void setIntegerForKey (const char *pKey, int value) Set integer value by key. void setFloatForKey (const char *pKey, float value) Set float value by key. void setDoubleForKey (const char *pKey, double value) Set double value by key. void setStringForKey (const char *pKey, const std::string &value) Set string value by key. void flush () Save content to xml file. Static Public Member Functions static CCUserDefault * sharedUserDefault () static void purgeSharedUserDefault () static const std::string & getXMLFilePath ()
大家可以清楚的看到CCUserDefault这个类,存储是使用的是Key -Value,利用key来索引Value的值
现在我们举一个例子:
//存储并获取数据 CCUserDefault::sharedUserDefault()->setStringForKey("name", "baibai"); CCUserDefault::sharedUserDefault()->flush();//写了东西要提交 std::string name = CCUserDefault::sharedUserDefault()->getStringForKey("name"); CCLOG("name: %s ", name.c_str());
好了,现在我们就能打印出name: baibai
注意事项:
1、写好了数据一定要记得提交,CCUserDefault会把数据存储在UserDefault.xml中,这个文件就在cocos2d-x-2.2的Debug.win32目录下。可以打开这个文件查看储存的数据。
2、key有遵循命名规则,千万不能想当然的给他随意命名,白白之前就在这上面吃过亏,希望大家谨记。
白白之前给key命名了score[i]这是不对的。
我们再来写一个例子
//保存 for (int i = 0; i < 5; ++i) { CCString* setScore = CCString::createWithFormat("a_%d",i); CCUserDefault::sharedUserDefault()->setIntegerForKey(setScore->getCString(), a[i]); } CCUserDefault::sharedUserDefault()->flush();//提交 //获取 for (int i = 0; i < 5; ++i) { CCString* getScore = CCString::createWithFormat("a_%d",i); int score[i] = CCUserDefault::sharedUserDefault()->getIntegerForKey(getScore->getCString()); CCLOG("score[%d]: %d", i, score[i]); }
ok,现在这些数据就能做为排行榜使用了