Objective--c Practice and source code

Qustion: (MRC)

1. Define a Computer class

Instance variable: float width; NSString *name;

Method: An initialization function with two parameters; print () function; Dealloc () function;

2. Define a person class

Instance variable: NSString *name; Computer *c; int age;

Method: An initialization function with three parameters; print () function; Dealloc () function;

Requirement: Objects created with this class can copy and save files.

3, the main function requirements:

A) Create the object cc and the Person class object PP for the computer class, respectively, and output the object information.

b) Use copy function to create the person class object P1; and output Object information

c) the PP into the file hello.txt, the file directory is the documents directory.

d) Read the object P2 from the file Hello.txt and output the object information.

e) memory leaks and multiple deletions cannot occur.

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Source Code:

1 #import<Foundation/Foundation.h>2 3 @interfaceComputer:nsobject <NSCoding>4 5@property (nonatomic, assign)floatwidth;6@property (nonatomic, retain) NSString *name;7 8- (ID) Initwithwidth: (float) W Andname: (NSString *) n;9 Ten- (void) print; One  A @end -  - #import "Computer.h" the  - @implementationComputer -  -- (ID) Initwithwidth: (float) W Andname: (NSString *) n + { -     if(self =[Super init]) +     { A_width =W; atSelf.name =N; -     } -     returnSelf ; - } -  -- (void) Print in { -NSLog (@"Width =%f, Name =%@", _width, _name); to } + //Coding -- (void) Encodewithcoder: (Nscoder *) Acoder the { *[Acoder encodeobject:[nsnumber Numberwithfloat:_width] Forkey:@"1"]; $[Acoder encodeobject:_name Forkey:@"2"];Panax Notoginseng } - //decoding the- (ID) Initwithcoder: (Nscoder *) Adecoder + { A     if(self =[Super init]) the     { +_width = [[Adecoder decodeobjectforkey:@"1"] Floatvalue]; -Self.name = [Adecoder decodeobjectforkey:@"2"]; $     } $     returnSelf ; - } -  the- (void) Dealloc - {WuyiSelf.name =Nil; the [Super Dealloc]; - } Wu  - @end About  $ #import<Foundation/Foundation.h> -  - @classcomputer; - @interfacePerson:nsobject <nscoding, nscopying> A  +@property (nonatomic, assign)intAge ; the@property (nonatomic, retain) NSString *name; -@property (nonatomic, retain) computer *C; $  the- (ID) Initwithage: (int) a andname: (NSString *) n andcomputer: (Computer *) cc; the  the- (void) print; the  - @end in  the #import "Person.h" the #import "Computer.h" About  the @implementation Person the  the- (ID) Copywithzone: (Nszone *) Zone + { -Person *p =[[Person Allocwithzone:zone] initwithage:_age andname:_name Andcomputer:_c]; the     returnp;Bayi } the  the- (void) Encodewithcoder: (Nscoder *) Acoder - { -[Acoder encodeobject:_name Forkey:@"1"]; the[Acoder encodeobject:_c Forkey:@"2"]; the[Acoder encodeobject:[nsnumber Numberwithint:_age] Forkey:@"3"]; the } the  -- (ID) Initwithcoder: (Nscoder *) Adecoder the { the     if(self =[Super init]) the     {94Self.name = [Adecoder decodeobjectforkey:@"1"]; theSELF.C = [Adecoder decodeobjectforkey:@"2"]; the_age = [[Adecoder decodeobjectforkey:@"3"] intvalue]; the     }98     returnSelf ; About } - 101- (ID) Initwithage: (int) a andname: (NSString *) n andcomputer: (Computer *) cc102 {103     if(self =[Super init])104     { the_age =A;106Self.name =N;107SELF.C =cc;108     }109     returnSelf ; the }111  the- (void) Print113 { theNSLog (@"Age =%d, Name =%@, computer =%@", _age, _name, _c); the } the 117- (void) Dealloc118 {119Self.name =Nil; -SELF.C =Nil;121     122 [Super Dealloc];123 }124  the @end126 127 #import<Foundation/Foundation.h> - #import "Computer.h"129 #import "Person.h" the 131 intMainintargcConst Char*argv[]) { the @autoreleasepool {133Computer *C = [[Computer alloc] Initwithwidth:20.5Andname:@"Apple"];134 [C print];135         136Person *p = [[Person alloc] Initwithage: -Andname:@"xiaoming"Andcomputer:c];137 [P print];138         139Person *P1 =[P copy]; $ [P1 print];141         142NSString *path =@"/users/hskj/documents/hello.txt";143 [Nskeyedarchiver archiverootobject:p Tofile:path];144Person *P2 =[Nskeyedunarchiver Unarchiveobjectwithfile:path];145 [P2 print];146         147 [P1 release];148 [P release];149 [C release]; Max     }151     return 0; the}

Objective--c Practice and source code