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As we already noted, you should begin every project by choosing File > New Project, choosing a template, and naming your file. For your first sample project, select the Window-Based Application template, and use the name Helloworldxc. Make sure you select iPhone from the Product drop-down menu. Before you start writing new code, you need a basic understanding of what s there already, so we examine the contents of the three most important files that your basic template created: main.m, helloworldxcAppDelegate.h, and helloworldxcAppDelegate.m.

The verifyUrl( ) method, shown here, is used throughout SearchCrawler to verify the format of a URL. Additionally, this method serves to convert a string representation of a URL into a URL object:

01234567890123456789012345678901

The first file created by Xcode is main.m, which contains the main function. main.m comes with standard code preinstalled for you, as you can see here:

#import <UIKit/UIKit.h> int main(int argc, char *argv[]) { NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; int retVal = UIApplicationMain(argc, argv, nil, nil); [pool release]; return retVal; }

// Verify URL format. private URL verifyUrl(String url) { // Only allow HTTP URLs. if (!url.toLowerCase().startsWith("http://")) return null; // Verify format of URL. URL verifiedUrl = null; try { verifiedUrl = new URL(url); } catch (Exception e) { return null; } return verifiedUrl; }

The creation of this main routine is automatic, and you generally shouldn t have to fool with it at all. But it s worth understanding what s going on. You start with an #import directive, which you ll recall is Objective-C s substitute for #include. More specifically, you include the UIKit framework, the most important framework in Objective-C. This isn t needed, because it s also in the Prefix.pch file; but at least at the time of this writing, it s part of the default main.m file. You next create an NSAutoreleasePool. Recall that we mentioned this in our discussion of memory management in the previous chapter. It s what supports the NSObject s autorelease method. Also note that you release the pool after you ve run your application s main routine, following the standard rule that if you allocate the memory for an object, you must also release it. The UIApplicationMain line creates your application and kicks off the event cycle. The function s arguments look like this:

The identifier field will always be the same for any SphereNet packet, and let s define what it will contain:

This method first verifies that the given URL is an HTTP URL since only HTTP URLs are supported by Search Crawler. Next, the URL being verified is used to construct a new URL

int UIApplicationMain ( int argc, char *argv[], NSString *principalClassName, NSString *delegateClassName );

As with the rest of the main.m file, you should never have to change this. But we nevertheless briefly touch on what the latter two arguments mean although they ll usually be set to their defaults, thanks to the nil arguments.

object. If the URL is malformed, the URL class constructor will throw an exception resulting in null being returned from this method. A null return value is used to denote that the string passed to url is not valid or verified.

principalClassName defines the application s main class, which is UIApplication by default. This class does a lot of the action- and event-controlling for your program, topics that we ll return to in chapter 6. The UIApplication object is created as part of this startup routine, but you ll note that no link to the object is provided. If you need to access it (and you will), you can use a UIApplication class method to do so:

static const uint32_t kSphereNetPacketIdentifier = 'SpHn';

The isRobotAllowed( ) method fulfills the robot protocol. In order to fully explain this method, we ll review it line by line. The isRobotAllowed( ) method starts with these lines of code:

[UIApplication sharedApplication];