张运涛

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#import <Foundation/Foundation.h>

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#define FILE_NAME @"/tmp/data.txt"

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@interface NSArrayTest : NSObject {

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}

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-(void) Test;

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@end

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#import "NSArrayTest.h"

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@implementation NSArrayTest

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-(void) Test

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{

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    NSArray *arr = [NSArray arrayWithObjects:@"one",@"two",@"three",nil];//注:最后一个要以nil结尾

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    [arr writeToFile:FILE_NAME atomically:YES];//(序列化为xml格式后)保存文件

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    NSArray *arr2 = [NSArray arrayWithContentsOfFile:FILE_NAME];//read file

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    NSLog(@"%@",arr2);

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}

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@end

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<?xml version="1.0" encoding="UTF-8"?>

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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

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<plist version="1.0">

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<array>

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    <string>one</string>

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    <string>two</string>

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    <string>three</string>

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</array>

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</plist>

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#import <Foundation/Foundation.h>

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@interface Sample : NSObject<NSCoding> {

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    NSString* name;

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    int magicNumber;

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    float shoeSize;

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    NSMutableArray *subThingies;   

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}

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@property(copy) NSString* name;

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@property int magicNumber;

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@property float shoeSize;

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@property (retain) NSMutableArray *subThingies;

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-(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float) ss;

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@end

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#import "Sample.h"

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@implementation Sample

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@synthesize name;

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@synthesize magicNumber;

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@synthesize shoeSize;

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@synthesize subThingies;

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-(id) initWithName:(NSString *)n magicNumber:(int)m shoeSize:(float)ss

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{

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    if (self=[super init])

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    {

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        self.name = n;

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        self.magicNumber = m;

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        self.shoeSize = ss;

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        self.subThingies = [NSMutableArray array];

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    }

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    return (self);

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}

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-(void) dealloc

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{

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    [name release];

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    [subThingies release];

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    [super dealloc];

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}

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//将对象编码(即:序列化)

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-(void) encodeWithCoder:(NSCoder *)aCoder

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{

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    [aCoder encodeObject:name forKey:@"name"];

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    [aCoder encodeInt:magicNumber forKey:@"magicNumber"];

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    [aCoder encodeFloat:shoeSize forKey:@"shoeSize"];

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    [aCoder encodeObject:subThingies forKey:@"subThingies"];

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}

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//将对象解码(反序列化)

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-(id) initWithCoder:(NSCoder *)aDecoder

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{

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    if (self=[super init])

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    {

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        self.name = [aDecoder decodeObjectForKey:@"name"];

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        self.magicNumber = [aDecoder decodeIntForKey:@"magicNumber"];

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        self.shoeSize = [aDecoder decodeFloatForKey:@"shoeSize"];

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        self.subThingies = [aDecoder decodeObjectForKey:@"subThingies"];

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    }

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    return (self);

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}

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-(NSString*) description

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{

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    NSString *description = [NSString stringWithFormat:@"%@:%d/%.1f %@",name,magicNumber,shoeSize,subThingies];

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    return (description);

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}

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@end

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#import <Foundation/Foundation.h>

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#import "Sample.h"

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

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    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];   

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    Sample *s1 = [[Sample alloc] initWithName:@"thing1" magicNumber:42 shoeSize:10.5]; 

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    [s1.subThingies addObject:@"1"];

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    [s1.subThingies addObject:@"2"];

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    NSLog(@"%@",s1);   

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    NSData  *data1 = [NSKeyedArchiver archivedDataWithRootObject:s1];//将s1序列化后,保存到NSData中

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    [s1 release];

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    [data1 writeToFile:@"/tmp/data.txt" atomically:YES];//持久化保存成物理文件

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    NSData *data2 = [NSData dataWithContentsOfFile:@"/tmp/data.txt"];//读取文件

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    Sample *s2 = [NSKeyedUnarchiver unarchiveObjectWithData:data2];//反序列化  

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    NSLog(@"%@",s2);

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    [pool drain];

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    return 0;

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}