简单示例归档与解档的过程

//
//  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;
}

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;
}