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Those errors will behave exactly like the ones generated by NSFileManager, including displaying human-readable text that we re not specifying anywhere! As it turns out, the source of this magic seems to be the NSError class itself. It apparently has enough builtin specific knowledge about Cocoa s error domains and error codes to generate meaningful sentences about many of the errors that a program is likely to encounter. This means that in general, the errors provided to you by Cocoa method calls won t need to be prettied up in order to be shown to users.

The interface planning process identifies, documents, and confirms the relationships within a program, with other programs within an organization, and even outside of the organization, such as government, media, or community interfaces A careful study of the program will reveal where programs need to communicate, interact, or affect other programs and entities It s the responsibility of this program plan to confirm these relationships and then create a way to manage the interfaces these program relationships demand Figure 6-2 captures all of the inputs and outputs of this process

This is convenient for the built-in types, but it doesn t work for classes or structs because the sort routine doesn t know how to order them.

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And how about showing errors to users, while we re at it Here we ve been calling [NSApp presentError:e] to make the application display a modal window, but there are some other choices. In truth, the presentError: method is implemented in NSResponder, NSDocument, and NSDocumentController, which means that whenever an error occurs, you can pass it along to the nearest or most relevant object around, at which point it is passed along a chain of responsibility, similar to the responder chain, until some object actually displays the error. This opens up possibilities for displaying error messages in a different fashion, such as with a document-modal sheet alert.

The .NET Framework has some nice ways for a class or struct to specify how to order instances of the class or struct. In the simplest one, the object implements the IComparable interface: using System; public class Employee: IComparable { public Employee(string name, int id) { this.name = name; this.id = id; } int IComparable.CompareTo(object obj) { Employee emp2 = (Employee) obj; if (this.id > emp2.id) return(1); if (this.id < emp2.id) return(-1); else return(0); } public override string ToString() { return(String.Format("{0}:{1}", name, id)); } string name; int id; } class Test { public static void Main() { Employee[] arr = new Employee[4]; arr[0] = new Employee("George", 1); arr[1] = new Employee("Fred", 2); arr[2] = new Employee("Tom", 4); arr[3] = new Employee("Bob", 3);

As a general rule, the larger the program, the more interfaces you ll find Many programs will use an integrated team approach among all of the programs that ll interact through their own respective life cycles This integrated team may address internal program interfaces for each program, but mainly they ll identify and address the interfaces among the programs, government agencies, vendors, and other program stakeholders that will be involved with the program

You ve now seen the primary ways that a Cocoa app can deal with various kinds of unpleasantness, how to avoid some common mistakes, and how to use gdb to help track down problems. You ve also seen how methods can use NSError instances to deal with problems in a controlled manner. All of this will come in handy as you delve further into Cocoa programming.

Array.Sort(arr); foreach (Employee emp in arr) Console.WriteLine("Employee: {0}", emp); // Find employee id 2 in the list; Employee employeeToFind = new Employee(null, 2); int index = Array.BinarySearch(arr, employeeToFind); if (index != -1) Console.WriteLine("Found: {0}", arr[index]); } } This program gives you the following output: Employee: George:1 Employee: Fred:2 Employee: Bob:3 Employee: Tom:4 Found: Fred:2 This sort implementation allows only one sort ordering; you could define the class to sort based on employee ID or based on name, but you have no way to allow the user to choose which sort order they prefer. This example also uses the BinarySearch() method to find an employee in the list. For this to work, the array (or ArrayList) must be sorted, or the results won t be correct.

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