仿造NSKeyedArchiver和NSKeyedUnrarchiver，对COCOS2DX数组对象归档

最新推荐文章于 2021-07-09 14:25:09 发布

coderKeNan

最新推荐文章于 2021-07-09 14:25:09 发布

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分类专栏： cocos2d-x

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本文介绍了一种适用于Cocos2dx初学者的数据存档方法，通过模仿NSCoding接口和NSKeyedArchiver/NSKeyedUnarchiver的功能，实现了数组数据的归档与读取。

~~~~本文章为 OwenTsang(fromOld-Boys-Studio)原创,转载务必在明显处注明：

原文连接：http://blog.youkuaiyun.com/owen_c/article/details/9750419

Cocos2dx如何保存一个数据的数据呢？只对于初学者来说，总感觉有点麻烦，特别是从cocos2d-iphone转过来cocos2dx的同学们，更是很烦恼，在IOS中使用NSKeyedArchiver和NSKeyedUnrarchiver就可以很容易地对数组的数据归档了，但初涉cocos2dx的同学感觉有点无措了，其实这果中方法很简单，就是加一个索引下标就可以了。闲话不叙，下面说说怎么加吧。

1 仿造NSCoding的OBCoding

[cpp]view plaincopy 
   
 class OBCoding: public CCObject  
 {  
 protected:  
     OBCoding():CCObject(){}  
 public:  
     virtual void encodeWithCoder(CCUserDefault* encoder,const char* primerKey = NULL) = 0;  
     virtual OBCoding* initWithCoder(CCUserDefault* decoder,const char* primerKey = NULL) = 0;  
 };  

2 仿造NSKeyedArchiver宏

[cpp]view plaincopy 
   
 #define OB_ARCHIVED_ARRAY(xmlWriter,arrayName,array) \  
             {\  
                 if(!xmlWriter ||!arrayName || !array)\  
                 return;\  
                 int count =array->count();\  
                 xmlWriter->setIntegerForKey(CCString::createWithFormat("%s_count",arrayName)->getCString(),count);\  
                 for(int i = 0; i < count ; ++i)\  
                 {\  
                     OBCoding* coder= (OBCoding*)array->objectAtIndex(i);\  
                     coder->encodeWithCoder(xmlWriter,CCString::createWithFormat("%s_%d",arrayName,i)->getCString());\  
                 }\  
             }  

3 仿造NSKeyedUnrarchiver宏

[cpp]view plaincopy 
   
 #define OB_UNARCHIVED_ARRAY(unarchivedArray,xmlReader,arrayName,TYPE_NAME)\  
             {\  
                 if(!xmlReader ||!arrayName){\  
                     unarchivedArray= NULL; \  
                 }\  
                 else{\  
                     int count = 0; \  
                     OBCoding* coder= NULL;\  
                     count =xmlReader->getIntegerForKey(CCString::createWithFormat("%s_count",arrayName)->getCString(),count);\  
                     if(count <= 0){\  
                        unarchivedArray = NULL; \  
                     }\  
                     else{\  
                        unarchivedArray = CCArray::createWithCapacity(count);\  
                         for(int i = 0; i < count ; ++i)\  
                         {\  
                             coder =dynamic_cast<OBCoding*>(new TYPE_NAME());\  
                            assert(coder);\  
                             coder->initWithCoder(xmlReader,CCString::createWithFormat("%s_%d",arrayName,i)->getCString());\  
                            unarchivedArray->addObject(coder);\  
                            coder->release();\  
                         }\  
                     }\  
                 }\  
            }  

4 测试

1）归档打包：

[cpp]view plaincopy 
   
 CCUserDefault* writer = CCUserDefault::sharedUserDefault();  
 OB_ARCHIVED_ARRAY(writer,"ClassOne",classOneArray);  
 writer->flush();  

2）归档解包

[cpp]view plaincopy 
   
 CCArray*  classOneArray = NULL;  
 CCUserDefault* reader = CCUserDefault::sharedUserDefault();  
 OB_UNARCHIVED_ARRAY(classOneArray,reader,"ClassOne",Student);  