how to create barcode in vb net 2008 12: Categories in Objective-C

Paint QR Code in Objective-C 12: Categories

CHAPTER 12: Categories
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Scrolling lists in Cocoa are handled by the AppKit class NSTableView. When the tableView is ready to do some work, such as selecting the row the user just clicked, the object asks its delegate if it can select the row. The tableView sends a message to its delegate:
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- (BOOL) tableView: (NSTableView *) tableView shouldSelectRow: (int) row;
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The delegate method can look at the tableView and the row and decide whether the row should be selected. If the table includes rows that shouldn t be selected, the delegate might implement the concept of disabled rows that are not selectable.
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The ITunesFinder Project
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The Cocoa class that lets you find network services published by Bonjour (the technology formerly called Rendezvous) is named NSNetServiceBrowser. You tell the net service browser what service you re looking for and give it a delegate object. The browser object then sends messages to the delegate object telling it when it sees new services. ITunesFinder, which lives in the 12.03 ITunesFinder project folder, uses NSNetServiceBrowser to list all the shared iTunes music libraries that it can find. For this project, we ll start out with main(), which lives in main.m. The delegate object is an instance of the class ITunesFinder, so we need to import its header file:
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#import <Foundation/Foundation.h> #import "ITunesFinder.h"
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And then main() starts. We set up the autorelease pool:
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int main (int argc, const char *argv[]) { NSAutoreleasePool *pool; pool = [[NSAutoreleasePool alloc] init];
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Next, a new NSNetServiceBrowser is born:
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NSNetServiceBrowser *browser; browser = [[NSNetServiceBrowser alloc] init];
And then a new ITunesFinder is created:
ITunesFinder *finder; finder = [[ITunesFinder alloc] init];
Because we re using alloc to create these, we must take responsibility for making sure they ll be released when we re done with them.
CHAPTER 12: Categories
Next, we tell the net service browser to use the ITunesFinder object as a delegate:
[browser setDelegate: finder];
Then, we tell the browser to go look for iTunes shares:
[browser searchForServicesOfType: @"_daap._tcp" inDomain: @"local."];
The _daap._tcp string tells the net service browser to look for services of type daap ( daap is short for Digital Audio Access Protocol ) using the TCP networking protocol. This incantation finds libraries published by iTunes. The domain local. means to look for the services on the local network. The Internet Assigned Numbers Authority (IANA) maintains a list of Internet protocol families, which usually map to the Bonjour service name. Next, main() logs the fact that it has begun browsing and starts a run loop:
NSLog (@"begun browsing"); [[NSRunLoop currentRunLoop] run];
A run loop is a Cocoa construct that blocks (that is, doesn t do any processing) until something interesting happens. In this case, interesting means that the net services browser discovers a new iTunes share. In addition to listening for network traffic, run loops handle other things like waiting for user events such as key presses or mouse clicks. The run method actually will not return; it will keep running forever, so the code that follows it won t ever execute. However, we ve left it in anyway to let readers of the code know that we re aware of proper memory management (we could construct a run loop that runs only for a specific amount of time, but that code is more complicated and doesn t really contribute to our discussion of delegates). So here s the clean-up code that won t actually get run:
[browser release]; [finder release]; [pool release]; return (0); } // main
Now, we have the net service browser and a run loop. The browser sends out network packets looking for particular services, and packets come back saying, Here I am. When these packets come back, the run loop tells the net service browser, Here are some packets for you. The browser then looks at the packets, and if they re from a service it hasn t seen before, it sends messages to the delegate object telling it what happened.
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