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Generation QR Code in Objective-C -(id)initForWritingWithMutableData:(NSMutableData *)data

-(id)initForWritingWithMutableData:(NSMutableData *)data
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This method takes a writable data object and returns the archived object as an id You can then write the archive to disk The steps for creating and writing an archive to disk are as follows First, create an NSMutableData object
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NSMutableData * theData = [NSMutableData data];
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After creating the data object, create an NSKeyedArchiver, passing the newly created data object as a parameter
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NSKeyedArchiver * archiver = [[NSKeyedArchiver alloc] initForWritingWithMutableData:theData];
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After initializing the NSKeyedArchiver, encode the objects to archive If you wish, you can encode multiple objects using the same archiver, provided all archived objects adopt the NSCoding protocol The following code snippet illustrates:
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[archiver [archiver [archiver [archiver encodeObject:objectA forKey:@"a"]; encodeObject:objectB forKey:@"b"]; encodeObject:objectC forKey:@"c"]; finishEncoding];
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After archiving, write the data object, which now contains the archived objects, to a file
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[theData writeToFile:"myfilearchive" atomically:YES]
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NSKeyedUnarchiver
You use NSKeyedUnarchiver to unarchive an archive NSKeyedUnarchiver reconstitutes one or more objects from a data object that was initialized with an archive To be unarchived, an object must implement the NSCoding protocol When programming for iOS, you use the initForReadingWithData: method
-(id)initForReadingWithData:(NSData *)data
The steps to unarchive are similar to archiving First, create an NSData object from the previously archived file
NSData * theData =[NSData dataWithContentsOfFile:"myfilearchive"];
After creating the data object, create and initialize an NSKeyedUnarchiver instance
NSKeyedUnarchiver * uarchiver = [[NSKeyedUnarchiver alloc] initForRead ingWithData:theData];
After initializing the NSKeyedUnarchiver, unarchive the objects previously archived
A * objA = [[unarchiver decodeObjectForKey:@"a"] retain]; B * objB = [[unarchiver decodeObjectForKey:@"b"] retain]; C * objC = [[unarchiver decodeObjectForKey:@"c"] retain]; [unarchiver finishDecoding]; [unarchiver release];
Try This
Archiving and Unarchiving an Object
1 Create a new View-based Application called Encoding 2 Create a new Objective-C class called Foo 3 Add two properties to Foo Make one property an NSString and name it name and make
the other property an NSNumber and name it age
4 Have Foo adopt the NSCopying and NSCoding protocols (Listings 15-7 and 15-8)
Remember, Foo must get deep copies of name and age
5 Modify Foo so that it implements the encodeWithCoder:, initWithCoder:, and
copyWithZone: methods
15:
Property Lists and Archiving
6 Add Foo as a property to EncodingAppDelegate (Listings 15-9 and 15-10) 7 Implement the applicationWillTerminate: method and modify the applicationDidFinish
LaunchingWithOptions: method to decode and encode Foo
8 If you re building for SDK 40 or later, then iOS will suspend rather than terminate
your application, so the applicationWillTerminate will never be called Edit EncodingInfoplist in Resources and add another value to the end of the plist with key UIApplicationExitsOnSuspend, type Boolean and value YES (Later we ll talk about using archiving to save your application s state on suspension, so that it can resume where it left off whether iOS terminates it or only suspends it)
9 Click Run and the debugging log will indicate that it s the first pass through Stop
execution and then Run again and the debugging log will indicate that you ve unarchived the Foo object
Listing 15-7
Fooh
#import <Foundation/Foundationh> @interface Foo : NSObject <NSCoding, NSCopying> { NSString * name; NSNumber * age; } @property (nonatomic, retain) NSString * name; @property (nonatomic, retain) NSNumber * age; @end
Listing 15-8
Foom
#import "Fooh" @implementation Foo @synthesize name; @synthesize age; -(id) copyWithZone: (NSZone *) zone { Foo * aFoo = [[Foo allocWithZone:zone] init]; aFooname = [NSString stringWithString: selfname]; aFooage = [NSNumber numberWithInt:[selfage intValue]]; return aFoo; } -(void) encodeWithCoder: (NSCoder *) coder { [coder encodeObject: name forKey: @"name"]; [coder encodeObject:age forKey: @"age"]; }
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-(id) initWithCoder: (NSCoder *) coder { self = [super init]; name = [[coder decodeObjectForKey:@"name"] retain]; age = [[coder decodeObjectForKey:@"age"] retain]; return self; } -(void) dealloc { [name release]; [age release]; [super dealloc]; } @end
Listing 15-9
EncodingAppDelegateh
#import <UIKit/UIKith> @class Foo; @class EncodingViewController; @interface EncodingAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; EncodingViewController *viewController; Foo * myFoo; } @property (nonatomic, retain) Foo * myFoo; @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet EncodingViewController *viewController; @end
Listing 15-10
EncodingAppDelegatem
#import "EncodingAppDelegateh" #import "EncodingViewControllerh" #import "Fooh" @implementation EncodingAppDelegate @synthesize window; @synthesize viewController; @synthesize myFoo; - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
15:
Property Lists and Archiving
NSString *pathToFile = [[NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0] stringByAppendingPathComponent:@"fooarchive"]; NSLog(@"%@",pathToFile); NSData * theData =[NSData dataWithContentsOfFile:pathToFile]; if([theData length] > 0) { NSKeyedUnarchiver * archiver = [[[NSKeyedUnarchiver alloc] initForReadingWithData:theData] autorelease]; myFoo = [archiver decodeObjectForKey:@"myfoo"]; [archiver finishDecoding]; NSLog(@"nth run - name: %@ age: %i", myFooname, [myFooage intValue]); } else { NSLog(@"first run: no name or age"); myFoo =[[Foo alloc] init]; myFooname = @"James"; myFooage = [NSNumber numberWithInt:40]; } [window addSubview:viewControllerview]; [window makeKeyAndVisible]; return YES; } -(void) applicationWillTerminate: (UIApplication *) application { NSString *pathToFile = [[NSSearchPathForDirectoriesInDomains( NSDocumentDirectory, NSUserDomainMask,YES) objectAtIndex:0] stringByAppendingPathComponent:@"fooarchive"]; NSMutableData * theData = [NSMutableData data]; NSKeyedArchiver * archiver = [[[NSKeyedArchiver alloc] initForWritingWithMutableData:theData] autorelease]; [archiver encodeObject:selfmyFoo forKey:@"myfoo"]; [archiver finishEncoding]; if([theData writeToFile:pathToFile atomically:YES] == NO) NSLog(@"writing failed"); } -(void)dealloc { [myFoo release]; [viewController release]; [foo release]; [window release]; [super dealloc]; } @end
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