在Cocos2d-x存储数据使用的类是UserDefault类，以下分析下该类的使用
//.h
#include "base/CCPlatformMacros.h"
#include <string>
#include "base/CCData.h"
NS_CC_BEGIN
/**
* @addtogroup data_storage
* @{
*/
/**
* UserDefault acts as a tiny database. You can save and get base type values by it.
* For example, setBoolForKey("played", true) will add a bool value true into the database.
* Its key is "played". You can get the value of the key by getBoolForKey("played").
*
* It supports the following base types:
* bool, int, float, double, string
*/
class CC_DLL UserDefault
{
public:
// get value methods
/**
@brief Get bool value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is false.
* @js NA
*/
bool getBoolForKey(const char* pKey);
/**
* @js NA
*/
bool getBoolForKey(const char* pKey, bool defaultValue);
/**
@brief Get integer value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is 0.
* @js NA
*/
int getIntegerForKey(const char* pKey);
/**
* @js NA
*/
int getIntegerForKey(const char* pKey, int defaultValue);
/**
@brief Get float value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is 0.0f.
* @js NA
*/
float getFloatForKey(const char* pKey);
/**
* @js NA
*/
float getFloatForKey(const char* pKey, float defaultValue);
/**
@brief Get double value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is 0.0.
* @js NA
*/
double getDoubleForKey(const char* pKey);
/**
* @js NA
*/
double getDoubleForKey(const char* pKey, double defaultValue);
/**
@brief Get string value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is "".
* @js NA
*/
std::string getStringForKey(const char* pKey);
/**
* @js NA
*/
std::string getStringForKey(const char* pKey, const std::string & defaultValue);
/**
@brief Get binary data value by key, if the key doesn't exist, a default value will return.
You can set the default value, or it is null.
* @js NA
* @lua NA
*/
Data getDataForKey(const char* pKey);
/**
* @js NA
* @lua NA
*/
Data getDataForKey(const char* pKey, const Data& defaultValue);
// set value methods
/**
@brief Set bool value by key.
* @js NA
*/
void setBoolForKey(const char* pKey, bool value);
/**
@brief Set integer value by key.
* @js NA
*/
void setIntegerForKey(const char* pKey, int value);
/**
@brief Set float value by key.
* @js NA
*/
void setFloatForKey(const char* pKey, float value);
/**
@brief Set double value by key.
* @js NA
*/
void setDoubleForKey(const char* pKey, double value);
/**
@brief Set string value by key.
* @js NA
*/
void setStringForKey(const char* pKey, const std::string & value);
/**
@brief Set binary data value by key.
* @js NA
* @lua NA
*/
void setDataForKey(const char* pKey, const Data& value);
/**
@brief Save content to xml file
* @js NA
*/
void flush();
/** returns the singleton
* @js NA
* @lua NA
*/
static UserDefault* getInstance();
/**
* @js NA
*/
static void destroyInstance();
/** deprecated. Use getInstace() instead
* @js NA
* @lua NA
*/
CC_DEPRECATED_ATTRIBUTE static UserDefault* sharedUserDefault();
/**
* @js NA
*/
CC_DEPRECATED_ATTRIBUTE static void purgeSharedUserDefault();
/**
* @js NA
*/
const static std::string& getXMLFilePath();
/**
* @js NA
*/
static bool isXMLFileExist();
private:
UserDefault();
~UserDefault();
static bool createXMLFile();
static void initXMLFilePath();
static UserDefault* _userDefault;
static std::string _filePath;
static bool _isFilePathInitialized;
};
// end of data_storage group
/// @}
NS_CC_END
使用时在自己定义类的.cpp文件里加入UserDefault.h，使用离子例如以下：
//.cpp
#include "base/CCUserDefault.h
UserDefault::getInstance()->setStringForKey("key", "value");
auto value = UserDefault::getInstance()->getStringForKey("key","Default value");
log("key = %s",value.c_str());
执行结果例如以下图：控制台打印出 key = value；
