Cocos2d-x手游技术分享（1）-【天天打蚊子】数据存储与音效篇

前言：

　　手游项目《天天打蚊子》终于上线，特地写几篇技术分享文章，分享一下其中使用到的技术，其中使用cocos2d-x引擎，首选平台iOS，也请有iPhone或者iPad的朋友帮忙下载好评。十分感谢。

目前完美支持iPhone4、iPhone 4S、iPhone 5、iPad所有版本，iOS 5以上开始支持。

　　目前开发团队3个人，本人客户端+服务端，另有1名客户端，1名美术，目前创业刚刚起步，请各位好友支持！

　　《天天打蚊子》下载地址：https://itunes.apple.com/cn/app/id681203794

　　

一、Cocos2d-x中的数据存储。

1、CCUserDefault数据存储

CCUserDefault头文件：

class CC_DLL CCUserDefault
{
public:
    ~CCUserDefault();

    // 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.
    */
    bool    getBoolForKey(const char* pKey);
    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.
    */
    int     getIntegerForKey(const char* pKey);
    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.
    */
    float    getFloatForKey(const char* pKey);
    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.
    */
    double  getDoubleForKey(const char* pKey);
    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 "".
    */
    std::string getStringForKey(const char* pKey);
    std::string getStringForKey(const char* pKey, const std::string & defaultValue);

    // set value methods

    /**
    @brief Set bool value by key.
    */
    void    setBoolForKey(const char* pKey, bool value);
    /**
    @brief Set integer value by key.
    */
    void    setIntegerForKey(const char* pKey, int value);
    /**
    @brief Set float value by key.
    */
    void    setFloatForKey(const char* pKey, float value);
    /**
    @brief Set double value by key.
    */
    void    setDoubleForKey(const char* pKey, double value);
    /**
    @brief Set string value by key.
    */
    void    setStringForKey(const char* pKey, const std::string & value);
    /**
     @brief Save content to xml file
     */
    void    flush();

    static CCUserDefault* sharedUserDefault();
    static void purgeSharedUserDefault();
    const static std::string& getXMLFilePath();
    static bool isXMLFileExist();

private:
    CCUserDefault();
    static bool createXMLFile();
    static void initXMLFilePath();
    
    static CCUserDefault* m_spUserDefault;
    static std::string m_sFilePath;
    static bool m_sbIsFilePathInitialized;
};

　　其中包括多种方法（getBoolForKey，getFloatForKey，getIntegerForKey等等），可根据具体需要存储的数据类型进行选择。

具体实现：

　　比如在游戏开发过程中，要实现本地存储新手引导中的某一步是否已经访问过，我可以这样：

bool DataHelper::getIsVisit(EnumNewUserGuid type)
{
    const char * key = CCString::createWithFormat("NewUserGuid_%d",type)->getCString();
    return  CCUserDefault::sharedUserDefault()->getBoolForKey(key, false);
}

void DataHelper::setVisit(EnumNewUserGuid type)
{
    const char * key = CCString::createWithFormat("NewUserGuid_%d",type)->getCString();
    CCUserDefault::sharedUserDefault()->setBoolForKey(key, true);
}

　　其中，EnumNewUserGuid为新手引导的步骤的枚举。

　　下面将使用CCUserDefault实现音效管理。

2、iOS keychain数据存储

　　上篇文章讲到iOS keychain的数据存储方法，本文加上为C++的接口。keychain.h keychain.m文件再贴一次。

#import <Foundation/Foundation.h>

@interface Keychain : NSObject
//keychain
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service;
+ (void)saveData:(NSString *)service data:(id)data;
+ (id)loadData:(NSString *)service;
+ (void)deleteData:(NSString *)service;
@end

#import "Keychain.h"

@implementation Keychain

//keychain
+ (NSMutableDictionary *)getKeychainQuery:(NSString *)service
{
    NSMutableDictionary * dict = [NSMutableDictionary dictionaryWithObjectsAndKeys:
                                  (id)kSecClassGenericPassword,(id)kSecClass,
                                  service, (id)kSecAttrService,
                                  service, (id)kSecAttrAccount,
                                  (id)kSecAttrAccessibleAfterFirstUnlock,(id)kSecAttrAccessible,
                                  nil];
    return dict;
}

+ (void)saveData:(NSString *)service data:(id)data
{
    //Get search dictionary
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Delete old item before add new item
    SecItemDelete((CFDictionaryRef)keychainQuery);
    //Add new object to search dictionary(Attention:the data format)
    [keychainQuery setObject:[NSKeyedArchiver archivedDataWithRootObject:data] forKey:(id)kSecValueData];
    //Add item to keychain with the search dictionary
    SecItemAdd((CFDictionaryRef)keychainQuery, NULL);
}

+ (id)loadData:(NSString *)service
{
    id ret = nil;
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    //Configure the search setting
    //Since in our simple case we are expecting only a single attribute to be returned (the password) we can set the attribute kSecReturnData to kCFBooleanTrue
    [keychainQuery setObject:(id)kCFBooleanTrue forKey:(id)kSecReturnData];
    [keychainQuery setObject:(id)kSecMatchLimitOne forKey:(id)kSecMatchLimit];
    CFDataRef keyData = NULL;
    if (SecItemCopyMatching((CFDictionaryRef)keychainQuery, (CFTypeRef *)&keyData) == noErr) {
        @try {
            ret = [NSKeyedUnarchiver unarchiveObjectWithData:(NSData *)keyData];
        } @catch (NSException *e) {
            CLog(@"Unarchive of %@ failed: %@", service, e);
        } @finally {
        }
    }
    if (keyData)
        CFRelease(keyData);
    return ret;
}

+ (void)deleteData:(NSString *)service
{
    NSMutableDictionary *keychainQuery = [self getKeychainQuery:service];
    SecItemDelete((CFDictionaryRef)keychainQuery);
}

@end

　　下面用keychain记录本地账号：

DBInfoAccount.h

#include "cocos2d.h"

using namespace cocos2d;

class DBInfoAccount {

public:
    
    int m_iUserID;
    CCString * m_pAccountID;
    CCString * m_pPassword;
    
    DBInfoAccount();
    static DBInfoAccount * getInstance();
    bool isHasAccount();
    
    //数据存取
    void loadData();
    static void saveData();
    static void reset();
};

DBInfoAccount.mm

#import "Keychain.h"
#include "DBInfoAccount.h"



//#define kAccount                @"Account"
#define kAccountAccountID        @"Account_Account_ID"
#define kAccountUserID            @"Account_UserID"
#define kAccountPassword        @"Account_Pwd"



static DBInfoAccount * s_pDBInfoAccount = NULL;

DBInfoAccount::DBInfoAccount():
m_iUserID(0)
{
    m_pAccountID = new CCString("");
    m_pPassword = new CCString("");
}

DBInfoAccount * DBInfoAccount::getInstance()
{
    if (s_pDBInfoAccount == NULL) {
        s_pDBInfoAccount -> loadData();
        if (s_pDBInfoAccount == NULL) {
            s_pDBInfoAccount = new DBInfoAccount;
        }
    }
    
    return s_pDBInfoAccount;
}

bool DBInfoAccount::isHasAccount()
{
    return m_pAccountID!= NULL && m_pAccountID -> length()>0;
}

void DBInfoAccount::loadData()
{
    if (s_pDBInfoAccount == NULL) {
        NSString * accountID = [Keychain loadData: kAccountAccountID];
        NSString * userID = [Keychain loadData: kAccountUserID];
        NSString * password = [Keychain loadData: kAccountPassword];
        s_pDBInfoAccount = new DBInfoAccount;
        const char * c_accountID = [accountID cStringUsingEncoding:NSUTF8StringEncoding];
        DWORD c_userID = [userID  intValue];
        const char * c_password = [password cStringUsingEncoding:NSUTF8StringEncoding];
        
        if (c_accountID != NULL && c_password != NULL) {
            s_pDBInfoAccount -> m_pAccountID -> m_sString = c_accountID;
            s_pDBInfoAccount -> m_iUserID  = c_userID;
            s_pDBInfoAccount -> m_pPassword -> m_sString = c_password;
        }
    }
}

void DBInfoAccount::saveData()
{
    NSString * accountID = [NSString stringWithCString:s_pDBInfoAccount->m_pAccountID->getCString() encoding:NSUTF8StringEncoding];
    NSString * userID = [NSString stringWithFormat:@"%d",s_pDBInfoAccount->m_iUserID];
    NSString * password = [NSString stringWithCString:s_pDBInfoAccount->m_pPassword->getCString() encoding:NSUTF8StringEncoding];
    [Keychain saveData:kAccountAccountID data: accountID];
    [Keychain saveData:kAccountUserID data: userID];
    [Keychain saveData:kAccountPassword data: password];
}

void DBInfoAccount::reset()
{
    [Keychain deleteData:kAccountAccountID];
    [Keychain deleteData:kAccountUserID];
    [Keychain deleteData:kAccountPassword];
}

　　具体用法一目了然，不再赘述。

二、音效管理。

　　废话不说，直接上代码：

 void DataHelper::initMusicAndEffect()
{
    bool isEffectEnabel = DataHelper::getEffectEnable();
    CocosDenshion::SimpleAudioEngine::sharedEngine()->setEffectsVolume(isEffectEnabel);
    
    bool isMusicEnable = DataHelper::getMusicEnable();
    CocosDenshion::SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(isMusicEnable);
}
 bool DataHelper::getEffectEnable()
{
    return  CCUserDefault::sharedUserDefault()->getBoolForKey("Effect_Enable", true);
}
 bool DataHelper::getMusicEnable()
{
    return  CCUserDefault::sharedUserDefault()->getBoolForKey("Music_Enable", true);
}
 void DataHelper::setEffectEnable(bool isEnable)
{
    CCUserDefault::sharedUserDefault()->setBoolForKey("Effect_Enable", isEnable);
    CocosDenshion::SimpleAudioEngine::sharedEngine()->setEffectsVolume(isEnable);
}
 void DataHelper::setMusicEnable(bool isEnable)
{
    CCUserDefault::sharedUserDefault()->setBoolForKey("Music_Enable", isEnable);
    CocosDenshion::SimpleAudioEngine::sharedEngine()->setBackgroundMusicVolume(isEnable);
}

　　其中，CocosDenshion::SimpleAudioEngine::sharedEngine()->setEffectsVolume(isEffectEnabel)，setEffectsVolume为设置的音效大小（0~1）的方法，这里使用false（0）和true（1）直接设置，实现是否设置为静音。

　　至于播放背景音乐和音效，最好使用mp3格式的，iOS和安卓同时支持。

　　具体：

CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("bg.mp3", true);//播放背景音乐，第二个参数为是否循环播放

CocosDenshion::SimpleAudioEngine::sharedEngine()->playEffect("anjian.mp3");//播放音效，比如按键声

《天天打蚊子》下载地址：https://itunes.apple.com/cn/app/id681203794

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