OC中归档与解归档

//归档
        NSDictionary *aDic=[[NSDictionary alloc]initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3", nil];
        
        NSArray *array=[[NSArray alloc]initWithObjects:@"One",@"Two",@"Three", nil];
        
        NSMutableData *data1=[[NSMutableData alloc]init];
        
        NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc]initForWritingWithMutableData:data1];
        //将归档的数据全部写到data中,再将data中的数据写到文件中!
        [archiver encodeObject:aDic forKey:@"Mydic"];//将字典中的内容归档
        
        [archiver encodeObject:array forKey:@"Myarray"];//将数组中的内容归档
        
        [archiver finishEncoding];
        
        [data1 writeToFile:PATH atomically:YES];//将归档后的数据统一写入文件中
        [aDic release];
        [array release];
        [data1 release];
        [archiver release];
        
        
        
//解归档
        NSData *receiveData=[[NSData alloc]initWithContentsOfFile:PATH];
        NSKeyedUnarchiver * unarchiver=[[NSKeyedUnarchiver alloc]initForReadingWithData:receiveData];//
        NSDictionary *unarchiverAdic=[unarchiver decodeObjectForKey:@"Mydic"];
        NSLog(@"%@",unarchiverAdic);
        NSArray *unarchiverArray=[unarchiver decodeObjectForKey:@"Myarray"];
        NSLog(@"%@",unarchiverArray);
        

        
//以上是对OC中已有的数据类型进行的操作,若对自定义的数据类型进行归档与解归档,则方法如下
//1.头文件
#import <Foundation/Foundation.h>

@interface Student : NSObject <NSCoding>{
  NSString* _name;
  NSUInteger _age;
  
  //注:若该类是一个复合的数据类型,则该类中拥有的非系统自带的类型也必须实现NSCoding协议,否则无法归档,例如,假设该类含有一个Dog *_dog 的对象,该类非系统自带,则该类也必须实现NSCoding协议
}
@property (copy,nonatomic) NSString* name;
@property (assign,nonatomic) NSUInteger age;
- (id)initWithName:(NSString*)aName andAge:(NSUInteger)aAge;
  //NSCoding协议中要求实现的方法
//- (void)encodeWithCoder:(NSCoder *)aCoder;
//- (id)initWithCoder:(NSCoder *)aDecoder;

@end

//方法实现部分
#import "Student.h"

@implementation Student
- (id)init{
  return [self initWithName:@"张三丰" andAge:100];
}

- (NSString *)description
{
  return [NSString stringWithFormat:@"Name:%@ Age:%lu", self.name,self.age];
}

- (id)initWithName:(NSString*)aName andAge:(NSUInteger)aAge
{
  if (self = [super init]) {
    _name = aName;
    _age = aAge;
  }

  return self;
}

- (void)encodeWithCoder:(NSCoder *)aCoder{
  [aCoder encodeObject:[self name] forKey:@"Name"];
  [aCoder encodeInteger:(NSUInteger)self.age forKey:@"Age"];
}

- (id)initWithCoder:(NSCoder *)aDecoder{
  if (self = [super init]) {
    self.name = [aDecoder decodeObjectForKey:@"Name"];
    self.age = (NSUInteger)[aDecoder decodeIntegerForKey:@"Age"];
  }

  return self;
}
@end


3.main
#import <Foundation/Foundation.h>
#import "Student.h"

int main(int argc, const char * argv[])
{

  @autoreleasepool {
#if 0
      //系统类型的归档和解档操作
    NSDictionary* aDic = [[NSDictionary alloc]initWithObjectsAndKeys:@"hello",@"one",@"1000phone",@"two", nil];
    NSString* path = @"/Users/youDirector/Desktop/aDic.archive";
      //系统类的对象归档
    [NSKeyedArchiver archiveRootObject:aDic toFile:path];
    
    NSDictionary* bDic = [NSKeyedUnarchiver unarchiveObjectWithFile:path];
    
    NSLog(@"bDic:%@",bDic);
    NSLog(@"aDic:%@",aDic);
#endif
    
    Student* aStu = [[Student alloc] init];
    NSLog(@"aStu:%@",aStu);
    
    NSString* path = @"/Users/bencai/Desktop/aStu.archive";
    
    [NSKeyedArchiver archiveRootObject:aStu toFile:path];//自定类归档
    
    Student* bStu = [NSKeyedUnarchiver unarchiveObjectWithFile:path];//解归档
    NSLog(@"bStu:%@",bStu);

  }
    return 0;
}