INDEX in visual

Implement Code 3 of 9 in visual INDEX

PowerShell is incredibly picky about how you type commands. Command names never contain spaces; it s always Dir and never Di r. You must have a space after the
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Update the ButtonClick event handler to adjust the state of both the dialog and the button when the toggle is clicked.
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Adding the button-click event manually Because you can t take advantage of the designer and automatically hook up the control events, you have to manually add the click event to the button. The event is wired up to the button control after the control is created in CreateChildControls. Using IntelliSense in Visual Studio helps you write the code. When you type += after the Button.Click event and press the Tab key, Visual Studio writes the code for you. If you press Tab a second time, it also creates the event handler method skeleton for you. The source code row you wrote should look like this:
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The new files are accessible from the Contents pane. By default, the files are located outside the listed folders. Usually, you will move the new class files to the Classes folder by highlighting them and dragging them to the folder. Using CVS As you already know, Project Builder uses UNIX tools to perform many of its tasks. For version control, Project Builder uses CVS (Concurrent Versions System). The CVS revision control program stores a file s change history and supports commands for easy access to past versions of the file. CVS is built on top of a version control system called Revision Control System (RCS), and uses RCS commands behind the scene to perform its actions. (The RCS program dates back to the early 1980s and was written by Walter F. Tichy while at Purdue University.) Though the underpinnings of CVS and RCS are similar, the nomenclature, intended audience, and command set are very different. Both RCS and CVS are excellent choices for a version control system and are available under Mac OS X. The system you use really depends on the organization of your project. Project Builder supports CVS from its interface. Unfortunately, it does not currently support RCS. Setting up CVS for use with Project Builder is simple: you set up a CVS repository on one of your disks, set your CVS environment variables, and check in/out the project. Once these steps are complete, you can open the project under Project Builder and get full access to the CVS command set and repository. To make this clear, let s go through each step in more detail. Before using CVS, you need to configure a few things, including the CVS repository and the client environment. The first step is to set up the CVS repository and environment variables:
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CHAPTER 6: Switch View with Multiple Graphics
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his part of the book covers the problems and techniques that you ll need when introducing unit testing to an existing organization or code. In chapter 8, we ll deal with the tough issue of implementing unit testing in an organization, and cover techniques that can make your job easier. This chapter provides answers to some tough questions that are common when first implementing unit testing. In chapter 9, we ll look common problems associated with legacy code and examine some tools for working with it.
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NSAssert(condition,description) NSAssert1(condition,format,arg1) NSAssert2(condition,format,arg1,arg2) NSParameterAssert(condition)
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In Objective-C, you can change a class s behavior at runtime by adding methods to existing classes using categories. There are no such things as final classes in Objective-C; you can subclass anything, as long as you have a header file for it, because the compiler needs to know how big an object the superclass defines. In practice, you end up doing a lot less subclassing in Objective-C than in Java. Through mechanisms like categories and the dynamic runtime that allows sending any message to any object, you can put functionality into fewer classes, and you can also put the functionality into the class that makes the most sense. For instance, you can put a category on NSString to add a feature, such as reversing a string or removing all white space. Then, you can invoke that method on any NSString, no matter where it comes from. You re not restricted to your own string subclass to provide those features. Generally, the only times you need to subclass in Cocoa are when you are creating a brand new object (at the top of an object hierarchy), fundamentally changing the behavior of an object, or working with a class that requires a subclass because it doesn t do anything useful out of the box. For instance, the NSView class used by Cocoa for making user interface components has no implementation for its drawRect: method. You need to subclass NSView and override that method to draw in the view. But for many other objects, delegation and data sources are used. Because Objective-C can send any message to any object, an object does not need to be of a particular subclass or to conform to a particular interface, so a single class can be a delegate and data source to any number of different objects. Because data source and delegate methods are declared in categories, you don t have to implement all of them. Cocoa programming in Objective-C has few empty stub methods, or methods that turn around and invoke the same method on an embedded object just to keep the compiler quiet when adopting a formal protocol. With power comes responsibility, of course. With Objective-C s manual retain, release, and autorelease memory management system, it s easy to create tricky memory errors. Placing categories on other classes can be a very powerful mechanism, but if abused, it can make your code difficult to untangle and impossible to give to someone else. Plus, Objective-C is based on C, so you get all of C s baggage, along with its dangers when using the preprocessor, including the possibility of pointer-related memory errors.
if (!isOverBudget) shoppingList.addAll(recipe.getIngredients()); } } } } Objective-C #import <Cocoa/Cocoa.h> @interface Ingredient : NSObject @property (readonly) double cost; @end @interface Recipe : NSObject { NSMutableArray *ingredients; } @property (assign) NSMutableArray *ingredients; @end @interface Meal : NSObject { Recipe *recipe; } @property (assign) Recipe* recipe; @end @interface Budget : NSObject - (void)planExpenditure:(double)amount; - (BOOL)isOverBudget; @end @interface RecipeBoxController : NSObject { NSMutableArray *meals; } @property (assign) NSMutableArray *meals; @property (readonly,copy) Budget *mealBudget; - (void)makeLists;
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