QuickTime Kit Programming Guide - filibeto.org

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C H A P T E R 5 Extending the QT<strong>Kit</strong>Player To Stream Audio and Video 3. You also want to define the maximum number of URLs, in this case 15. Insert this line: #define kMaximumURLs 15 4. Now you want to add the following class methods to deal with opening the URL panel. Add these lines: + (id)openURLPanel { if (openURLPanel == nil) openURLPanel = [[self alloc] init]; return openURLPanel; } 5. Next, you need to add initialization code to initialize an OpenURLPanel instance and listen for application termination notifications. Add these lines: - (id)init { [super init]; // init [self setURLArray:[NSMutableArray arrayWithCapacity:10]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(writeURLs:) name:NSApplicationWillTerminateNotification object:NSApp]; } return self; 6. Insert the following code to handle deallocation of memory and notifications: - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; [self setURLArray:nil]; [super dealloc]; } 7. To get the URL string, insert this chunk of code: - (NSString *)urlString { NSString *urlString = nil; } // get the url urlString = [mUrlComboBox stringValue]; if (urlString == nil) urlString = [mUrlComboBox objectValueOfSelectedItem]; if ([urlString length] == 0) urlString = nil; return urlString; 90 Adding Code To Stream Audio and Video 2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.
C H A P T E R 5 Extending the QT<strong>Kit</strong>Player To Stream Audio and Video 8. To set the instance variable of the URL array, add the following code: - (void)setURLArray:(NSMutableArray *)urlLArray { [urlLArray retain]; [mUrlLArray retain]; mUrlLArray = urlLArray; } 9. The next block of code lets you restore the previous URLs. Insert the following block of code: - (void)awakeFromNib { NSArray *urls; // restore the previous urls urls = [[NSUserDefaults standardUserDefaults] objectForKey:kUserDefaultURLsKey]; [mUrlArray addObjectsFromArray:urls]; if (urls) [mUrlComboBox addItemsWithObjectValues:urls]; } 10. To set up deal with notifications, you need to add this chunk of code. This will enable you to “listen” for any notifications. Insert the following: - (void)writeURLs:(NSNotification *)notification { } NSUserDefaults *userDefaults; if ([mUrlArray count] { // init userDefaults = [NSUserDefaults standardUserDefaults]; // write out the urls [userDefaults setObject:mUrlArray forKey:kUserDefaultURLsKey]; [userDefaults synchronize]; } 11. To write to actions, validate and save the URL, add the following code: - (IBAction)doOpenURL:(id)sender { { NSString*urlString; NSURL*url; BOOLinformDelegate = YES; IMP callback; if ([sender tag] == NSOKButton) { // validate the URL url = [self url]; urlString = [self urlString]; Adding Code To Stream Audio and Video 91 2005-11-09 | © 2004, 2005 Apple Computer, Inc. All Rights Reserved.
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QuickTime Kit Programming Guide 200
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Contents Introduction Introduction
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Figures and Tables Chapter 1 The Qu
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F I G U R E S A N D T A B L E S Fig
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I N T R O D U C T I O N Introductio
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C H A P T E R 1 The QuickTime Kit A
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C H A P T E R 2 Building a Simple Q
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C H A P T E R 3 Extending the QTKit
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