简单示例归档与解档的过程

演示将一个字典类型归档到文件和从文件解档的过程。

//
//  main.m

/* 演示将一个字典类型进行归档和解档的过程 */

#define PATH @"/Users/apple/Documents/ios_dev/test_case/TestNSArchive/dic.plist"

#import <Foundation/Foundation.h>

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

        /* 归档:将数据写入文件 */
        
        NSDictionary *dic = @{@"key1":@"value1", @"key2":@"value2", @"key3":@"value3"};
        
        /* archivedDataWithRootObject:Returns a data object containing the encoded form of the 
         object graph whose root object is given. */
        NSData *data = [NSArchiver archivedDataWithRootObject:dic]; /* NSDictionary->NSData */
        
        /* writeToFile:Writes the bytes in the receiver to the file specified by a given path. */
        BOOL ret = [data writeToFile:PATH atomically: YES];
        if (ret == 0)
        {
            NSLog(@"write fail.");
            return 0;
        }
        
        
        /* 解档:方法1 */
        
        /* unarchiveObjectWithFile:Decodes and returns the object archived in the file path.*/
        id obj;
        obj = [NSUnarchiver unarchiveObjectWithFile:PATH]; /* path->id */
        NSLog(@"first:%@",obj);
        
        
        /* 解档:方法2 */
        
        /* unarchiveObjectWithData:Decodes and returns the object archived in a given NSData object.*/
        NSData *data2 = [NSData dataWithContentsOfFile:PATH]; /* path->NSData */
        obj = [NSUnarchiver unarchiveObjectWithData:data2]; /* NSData->id */
        NSLog(@"second:%@", obj);
        
    }
    return 0;
}

输出结果：

2015-12-12 21:59:03.075 TestNSArchive[510:15924] first:{
    key1 = value1;
    key2 = value2;
    key3 = value3;
}
2015-12-12 21:59:03.076 TestNSArchive[510:15924] second:{
    key1 = value1;
    key2 = value2;
    key3 = value3;
}