OC-归档和解归档

  1 //归档:将对象数据存储到文件的过程  NSArchiver
  2 //反归档:从文件中读取数据到对象中的过程
  3
  4 int main(int argc, const char * argv[]) {
  5     @autoreleasepool {
  6
  7 #if 0
  8         //使用系统的方法进行归档  NSArchiver
  9         NSDictionary *mutDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"111",@"one",@"222",@"two", nil];
 10         [mutDic setValue:[NSDate date] forKey:@"date"];
 11         [mutDic setValue:[NSNumber numberWithInteger:8889] forKey:@"num"];
 12         [mutDic setValue:[@"ios" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"data"];
 13
 14         BOOL flag = [NSArchiver archiveRootObject:mutDic toFile:@"/Users/qianfeng/Desktop/day21-OC11_时间类/day21_OC11_归档与反归档/arch.txt"];
 15         if (flag) {
 16             NSLog(@"文件归档成功");
 17         }else{
 18             NSLog(@"文件归档失败");
 19         }
 20
 21 #endif
 22
 23 #if 0
 24         //使用系统进行反归档  NSUnarchiver
 25         NSDictionary *dict1 = [NSUnarchiver unarchiveObjectWithFile:@"/Users/qianfeng/Desktop/day21-OC11_时间类/day21_OC11_归档与反归档/arch.txt"];
 26         if (dict1) {
 27             NSLog(@"dict = %@",dict1);
 28         }
 29 #endif
 30
 31 //#if 0
 32         //使用系统的方法进行归档  NSKeyedArchiver
 33         NSDictionary *mutDic = [NSMutableDictionary dictionaryWithObjectsAndKeys:@"111",@"one",@"222",@"two", nil];
 34         [mutDic setValue:[NSDate date] forKey:@"date"];
 35         [mutDic setValue:[NSNumber numberWithInteger:8889] forKey:@"num"];
 36         [mutDic setValue:[@"ios" dataUsingEncoding:NSUTF8StringEncoding] forKey:@"data"];
 37
 38         NSData *data = [NSKeyedArchiver archivedDataWithRootObject:mutDic];
 39         BOOL ret = [data writeToFile:@"/Users/qianfeng/Desktop/day21-OC11_json_归档和解归档类/day21_OC11_归档与反归档/lpj.plist" atomically:YES];
 40         if (ret) {
 41             NSLog(@"归档成功");
 42         }
 43         else{
 44             NSLog(@"归档失败");
 45         }
 46
 47 //#endif
 48
 49 #if 0
 50         //解归档
 51         NSData *data = [NSData dataWithContentsOfFile:@"/Users/qianfeng/Desktop/day21-OC11_json_归档和解归档类/day21_OC11_归档与反归档/lpj.plist"];
 52        //NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithFile:@"/Users/qianfeng/Desktop/day21-OC11_时间类/day21_OC11_归档与反归档/data.txt"];
 53         NSDictionary *dict = [NSKeyedUnarchiver unarchiveObjectWithData:data];
 54         if (dict) {
 55             NSLog(@"解归档成功");
 56             NSLog(@"%@",dict);
 57         }else{
 58             NSLog(@"解归档失败");
 59
 60         }
 61 #endif
 62
 63 #if 0
 64         //  NSSearchPathForDirectoriesInDomains 这个主要就是返回一个绝对路径用来存放我们需要储存的文件。
 65         NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
 66         NSString *documentsDirectory = [paths objectAtIndex:0];
 67         NSString *fullPath = [documentsDirectory stringByAppendingPathComponent:@"shoppingCar.plist"];
 68 #endif
 69
 70
 71     }
 72
 73
 74     @autoreleasepool {
 75
 76 #if 0
 77
 78         //手动归档 - (instancetype)initForWritingWithMutableData:(NSMutableData *)data;
 79
 80         //创建一个可变的数据对象
 81         NSMutableData *mulData = [[NSMutableData alloc] init];
 82
 83
 84         NSKeyedArchiver *keyArchiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:mulData];
 85         //数组对象
 86         NSArray *array = [NSArray arrayWithObjects:@"one",[NSNumber numberWithInteger:1111],[NSDate date],[@"i love ios" dataUsingEncoding:NSUTF8StringEncoding], nil];
 87         //字典对象
 88         NSDictionary *dict = [NSDictionary dictionaryWithObjectsAndKeys:@"111",@"one",array,@"array",[NSNumber numberWithInt:1212],@"num",[NSDate date],@"date", nil];
 89
 90         //对数组和字典进行编码 原理：其实是是将数组array和字典dict对象写入到可变数据对象mulData中。之后在利用muData的writeToFile将二进制数据写入到文档中
 91         [keyArchiver encodeObject:array forKey:@"array"];
 92         [keyArchiver encodeObject:dict forKey:@"dict"];
 93
 94         //编码结束一定需要调用finishEncoding方法
 95         [keyArchiver finishEncoding];
 96
 97         //写入文件
 98         BOOL flag = [mulData writeToFile:@"/Users/qianfeng/Desktop/day21-OC11_时间类/day21_OC11_归档与反归档/initForWritingWithMutableData.txt" atomically:YES];
 99         if (flag) {
100             NSLog(@"归档成功");
101         }else{
102             NSLog(@"归档失败");
103         }
104
105 #endif
106
107 #if 0
108         //手动解归档
109         //过程 1.首先创建一个NSData对象，并读取文件的内容  2.通过NSKeyedUnarchiver 的 initForReadingWithData方法从数据对象中解归档对象  3.通过关键字从解归档对象中获取数组对象和字典对象
110         NSData *data = [NSData dataWithContentsOfFile:@"/Users/qianfeng/Desktop/day21-OC11_时间类/day21_OC11_归档与反归档/initForWritingWithMutableData.txt"];
111         NSKeyedUnarchiver *keyUnarchiver = [[NSKeyedUnarchiver alloc] initForReadingWithData:data];
112
113         //通过关键字 解码数组
114         NSArray *array = [keyUnarchiver decodeObjectForKey:@"array"];
115         //通过关键字 解码字典
116         NSDictionary *dict = [keyUnarchiver decodeObjectForKey:@"dict"];
117
118         [keyUnarchiver finishDecoding];
119
120         NSLog(@"array = %@",array);
121         NSLog(@"dict = %@",dict);
122
123 #endif
124     }
125     return 0;
126 }

归档：将程序中的对象写入到文件的过程

解归档：将文件中的数据读取为程序中的对象的过程