NSString 转换成NSData 对象 

NSData* xmlData =[@"testdata" dataUsingEncoding:NSUTF8StringEncoding];

NSData 转换成NSString对象 

NSData* data;
NSString*result =[[NSString alloc] initWithData:data  encoding:NSUTF8StringEncoding];

NSData 转换成char* 

];

char* 转换成NSData对象 

];

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