programming in objective c pdf

... Stephen Kochan is the author and coauthor of several bestselling titles on the C language, including Programming in C (Sams, 2004), Programming in ANSI C (Sams, 1994), and Topics in C Programming (Wiley, ... the Technical Reviewers Michael Trent has been programming in Objective-C since 1997—and programming Macs since well before that He is a regular contributor to Steven Frank’s www.cocoadev.com Web ... applications for Mac OS X Michael holds a Bachelor of Science degree in computer science and a Bachelor of Arts degree in music from Beloit College of Beloit,Wisconsin He lives in Santa Clara, California,

Ngày tải lên: 12/08/2014, 23:22

... thebackslash character is a special character in the Objective-C system and does not actuallycount as a character In other words, the Objective-C compiler treats the character ’\n’as a single character, ... semicolon, and the third is the character zero—which is not the same as thenumber zero Do not confuse a character constant, which is a single character enclosed insingle quotes, with a C-style character ... @character is an NSStringcharacter string ject ob-NoteAppendix B discusses methods for storing characters from extended character sets, through special escape sequences, universal characters,

Ngày tải lên: 12/08/2014, 23:22

... the x-coordinate of the rectangle’s origin. In a similar manner, the fol- lowing expression retrieves the y-coordinate of the rectangle’s origin: myRect.origin.y Classes Owning Their Objects Can ... alloc] init]; ClassA *a = [[ClassA alloc] init]; ClassB *b = [[ClassB alloc] init]; [a initVar]; // uses ClassA method [a printVar]; // reveal value of x; [b initVar]; // use overriding ClassB ... http://www.simpopdf.com Extension Through Inheritance: Adding New Instance Variables myRect.origin = endPoint; [startPoint release]; [endPoint release]; [myRect release]; The copy of the XYPoint startPoint

Ngày tải lên: 12/08/2014, 23:22

... defined( GNUC ) #define NS_INLINE static inline_attribute_((always_inline)) #elif defined( MWERKS ) || defined( cplusplus) #define NS_INLINE static inline Trang 27Another common use of #ifis in ... @protocol Drawing3D <Drawing> Finally, a category also can adopt a protocol, like this: @interface Fraction (Stuff) <NSCopying, NSCoding> theNSCopyingandNSCodingprotocols As with class names, ... new category and some methods muddies the definition of the class and is notgood programming practice category can exist in a given Objective-C namespace.This can be tricky because the jective-C

Ngày tải lên: 12/08/2014, 23:22

... alloc] init]; void copyString (char *to, char *from); char string1[] = “A string to be copied.” 2 ; char string2[50]; copyString (string2, string1); charac-copyString.This reflects how the function ... previous character in text(assuming, of course, that textPtrwas not pointing to the beginning of textbefore this statement executed) Comparing two pointer variables in Objective-C is perfectly valid.This ... given by*intPtras an integer Unions One of the more unusual constructs in the Objective-C programming language is the union.This construct is used mainly in more advanced programming applications

Ngày tải lên: 12/08/2014, 23:22

... @”jbaker@kochan-wood.com”; AddressCard *card1 = [[AddressCard alloc] init]; AddressCard *card2 = [[AddressCard alloc] init]; AddressCard *card3 = [[AddressCard alloc] init]; AddressCard *card4 = ... *bName = @”Tony Iannino”; NSString *bEmail = @”tony.iannino@techfitness.com”; AddressCard *card1 = [[AddressCard alloc] init]; AddressCard *card2 = [[AddressCard alloc] init]; [card1 setName: aName ... AddressCard *card2 = [[AddressCard alloc] init]; AddressCard *card3 = [[AddressCard alloc] init]; AddressCard *card4 = [[AddressCard alloc] init]; AddressBook *myBook = [AddressBook alloc]; AddressCard

Ngày tải lên: 12/08/2014, 23:22

... stringWithString:was sent to the NSMutableStringclass, indicating that the string’scontents might have changed during the course of the program’s execution And becauseconstant character strings can’t ... reference count for myIntis matically decremented to 1 In general, removing an object from any collection has theside effect of decrementing its reference count.This implies that the following code ... garbage collection is on, methodcalls such as retain,autorelease, andreleaseare ignored Trang 20Copying Objects This chapter discusses some of the subtleties involved in copying objects.We introducethe

Ngày tải lên: 12/08/2014, 23:22

... not currently se- lected, click the label you just created to select it. Notice that the Inspector window auto- matically changes to give you information about the currently selected object in ... Writing iPhone Applications @property (nonatomic, retain) UIWindow *window; @property (nonatomic, retain) Fraction_CalculatorViewController *viewController; @end The UIWindow instance variable window ... the discipline of objectoriented programming In the latter case, I provide the meaning of the term as it specifically applies to the Objective-C language abstract class A class defined to

Ngày tải lên: 12/08/2014, 23:22

... function call with the actual code for the function itself, thus providing for faster execution.An example is shown here: inline int min (int a, int b) {... contain the converted floating-point ... interface declaration for a class called Point containing four instance variables: @interface Point: NSObject { @private int internalID; @protected float x; float y; @public BOOL valid; } The internalID ... instance method defined for the class, either in the interface section that explicitly defines the variable or in categories created for the class Inherited instance variables... + n produces

Ngày tải lên: 12/08/2014, 23:22

... of inheritance to create specialized classes without needing to change any existing classes When implementing a class you must define the capacities of those objects, that is, the member functions, ... global functions Chapter 13, Defining Classes, describes the steps for defining member functions 䊐 Definition Functions can be defined in any order, however, the first function is normally main This ... 169Exercise 2 // -// palindrome.cpp: Reads and compares lines of text // -#include <iostream> #include <string> using namespace std; string header = " * * * Testing palindromes

Ngày tải lên: 06/07/2014, 17:21

... -// circle.cpp // Defines and calls the function circle() // -#include <iostream> #include <iomanip> #include <string> using namespace std; // Prototype of circle(): void circle( ... value occurs, i.e., the function manipulates a local copy Thus, only a local copy of the string is changed in the function, but the string in the calling function remains unchanged Exercise 2 ... used to indicate an error For pointers, the symbolic constant NULL is defined as 0 in standard header files A pointer containing the value NULL is also called NULL pointer Trang 5䊐 Using Pointers

Ngày tải lên: 06/07/2014, 17:21

... public: // Public data members and methods here }; // account.h // Defining the class Account // -#ifndef _ACCOUNT_ // Avoid multiple inclusions #define _ACCOUNT_ #include <iostream> #include ... #include <string> using namespace std; class Account { string name; // Account holder unsigned long nr; // Account number double balance; // Account balance bool init( const string&, unsigned ... so-called public interface of the class. The opposite page shows a schematic definition of a class The privatesection gen-erally contains data members and the publicsection contains the access

Ngày tải lên: 06/07/2014, 17:21

... for initial- izing objects—more details are given later. 252 ■ CHAPTER 13 DEFINING CLASSES // account_t.cpp // Uses objects of class Account. // #include "Account.h" int main() { Account ... defining the methods for the class Account in a source file named Account.cpp, for example. The source code of the application program, for example, the code containing the function main, is independent ... of current2 to the corresponding members of current1. 254 ■ CHAPTER 13 DEFINING CLASSES // ptrObj.cpp // Uses pointers to objects of class Account. // #include "Account.h" // Includes

Ngày tải lên: 06/07/2014, 17:21

... the methods in this “friendly” class automatically become friendfunctions in the class containing the frienddeclaration This technique is useful if a class is used in such close conjunction with ... declaration, which eliminates data encapsulation in certain cases. Imagine you need to write a global function that accesses the elements of a numerical array class If you need to call the access ... FRIEND CLASSES Class Result Class ControlPoint Trang 7䊐 Declaring Friend ClassesIn addition to declaring individual friendfunctions, you can also make entire classes “friends” of another class

Ngày tải lên: 06/07/2014, 17:21

... derived class, C. The C class inherits the B class, which is defined in the public section following the colon. The private and public sections contain additional members of the C class. ᮀ Access ... of class Truck PassCar Truck CONCEPT OF INHERITANCE ■ 501 ᮀ Base Classes and Derived Classes Inheritance allows new classes to be constructed on the basis of existing classes. The new derived class ... objects are constructed and destroyed, and ■ how access control to base classes can be realized. chapter 23 500 ■ CHAPTER 23 INHERITANCE ■ CONCEPT OF INHERITANCE Is relation Car Properties and capacities

Ngày tải lên: 06/07/2014, 17:21

... application programming interface 153where c:\picture.jpg is the image you wish to display 5.6 Mail application programming interface Microsoft Outlook provides an interface to applications to access ... form a custom Web browser This time, instead of includingthe COM control in the project by right-clicking on the toolbox and add-ing it there, we call the COM control directly through code This ... = New Object(1) {} Dim ITCObject As Object ITC = Type.GetTypeFromProgID("InetCtls.Inet") ITCObject = Activator.CreateInstance(ITC) parameter(0) = CType(tbServer.Text, String) parameter(1)

Ngày tải lên: 12/08/2014, 21:20

... the new sockets The server gets a socket for an incoming client connection by calling accept () int accept(int socket, struct sockaddr *clientAddress, unsigned int *addressLength) accept() dequeues ... new socket using send() and r ecv ( ) 9 Close the client connection using c l o s e ( ) Creating the socket, sending, receiving, and closing are the same as in the client The differences in the ... s t r u c t sockaddr_in) When connect () returns successfully, the socket is connected and c o m m u n i c a t i o n can proceed with calls to send() and recv() int send(int socket, c o n s t

Ngày tải lên: 05/11/2012, 14:45

... = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol); Trang 24Accepting Connections#include <sys/types.h> #include <sys/socket.h> int connfd; struct sockaddr_in cliaddr; ... give structure to the address struct in_addr { in_addr_t s_addr; }; struct sockaddr_in { uint8_t sin_len; sa_family_t sin_family; in_port_t sin_port; struct in_addr sin_addr; char sin_pad[16];}; ... structure to the address struct in6_addr { uint8_t s6_addr[16];}; struct sockaddr_in6 { uint8_t sin6_len; sa_family_t sin6_family; in_port_t sin6_port; uint32_t sin6_flowinfo; struct in6_addr

Ngày tải lên: 05/09/2013, 09:57

... string is used, storage space for all of the characters contained in the string must be allocated for ever operation the string is being used for In the case of sending a standard string acrossconnections, ... sent, creating tag ID numbers for chat messages would be pretty useless Strings can contain formatting codes, as described in Table 4.1 Table 4.1 Torque Script String Formatting Codes Code Description ... object class to another Properties are variables that belong to specific objects and, like methods, are accessed throughobjects Creating an Object When creating a new instance of an object, you can

Ngày tải lên: 21/01/2014, 23:20

... DataTableCollection ConstraintCollection DataTable DataRowCollection DataColumnCollection DataRelationCollection Your Application Figure 3.1 Typical architecture of ADO.NET 2.0 Connection ... panel Click on the Constraints tab and then click the Create button Enter COURSE_FACULTY_FK into the Constraint Name box, and select the Foreign Key from the Constraint Type box, which is shown in ... Database Programming With Visual C#.NET, by Ying Bai Copyright © 2010 the Institute of Electrical and Electronics Engineers, Inc. Trang 20ferred interface for Visual Basic programmers to access various

Ngày tải lên: 26/01/2014, 08:20