如何存储文件 cocos2dxcocos2dx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
[cpp]
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:
[cpp]
//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
[cpp]
//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